Re: [Repeater-Builder] REPCO 2 watt vhf transmitter strip- info request

[Mike Morris WA6ILQ]

At 08:01 PM 04/22/07, you wrote:

Hi Art,

Have you found the data you were looking for? If not, I might be 
able to help. I found manuals for both the VHF and UHF Repco 
receivers and transmitters in the S-COM archives. They're referred 
to as the RDL series of RF Link Devices, and apparently there were 
both voice and data versions. We had some of the data-only TX strips 
years ago, so W0INK designed a pre-emphasis/limiting/filtering 
circuit to use them for voice operation.


The manuals are copies of copies and are a little rough in spots.

Mike/ILQ: Interested in posting them on Repeater-Builder?


Absolutely.
Standard policy is to post material like this on the "Other
Manufacturers" page until we get three or four entries for
that manufacturer, then to create a separate page for it.
The Radio Shack, Ritron, Tait, Uniden and a few other
pages started that way.


73,
Bob Schmid, WA9FBO, Member
S-COM, LLC
PO Box 1546
LaPorte CO 80535-1546
970-416-6505 voice
970-419-3222 fax
www.scomcontrollers.com



Mike WA6ILQ

Re: [Repeater-Builder] Cushman Service Monitor Repair

[Jim McLaughlin]

I've had great service from from Bob at Cardinal.

www.cardinalelec.com/


Jim-WA9FPT

  - Original Message - 
  From: Randy 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, April 22, 2007 3:37 PM
  Subject: [Repeater-Builder] Cushman Service Monitor Repair


  I have a Cushman Field Service Monitor that has a couple things not
  working right. Anyone know of a reliable shop that services these old
  Cushmans?



   

[Repeater-Builder] Re: Seeking feed thru' cap value.

[skipp025]

Re: Seeking feed thru' cap value.

The min value is no feed-through capacitor... just a straight 
feed-through although pretty much anything you use will have 
some Capacitance... resistance and inductance included. 

You're going to see a whole lot of different cap values used 
by various people/mfgs so often no value is fixed in stone as 
an industry standard. 

You would also like the capacitor value not to color any non 
fixed power wire signal (ie audio or logic). In cases of some 
semi critical lines I use just a plain (no lumped/added capacitance)
feed-throughs. 

For a long time I've been using 200pf feed-through caps with great 
results. A "well built" repeater assembly doesn't need a lot of 
extra help to keep the local FM Station out of the box. If you fight 
vhf rf... a few hundred pf is a nice value to start out with. 

I have 1000pf & 2000pf caps here... along with a lot of other 
values but have no real burn to use any special value unless 
there is some type of serious problem with the final result. 
Otherwise I most often use what the flea market and Ebay offer 
up cheap and easy. 

cheers, 
skipp 

> "Doug Hutchison" <[EMAIL PROTECTED]> wrote:
>
> What value of cap should be used as a minimum for TX RX controller 
> inter-connection. 1000pf, 5000pf?
> 
> Doug - GM7SVK
>

Re: [Repeater-Builder] Re: Need VHF MSR2000 Repeater help

[WD7F - John in Tucson]

- Original Message - 
From: "kk2ed" <[EMAIL PROTECTED]>
To: 
Sent: Sunday, April 22, 2007 8:53 PM
Subject: [Repeater-Builder] Re: Need VHF MSR2000 Repeater help



I have a bunch of MSR2000s here. I know the Canadian version was
offered as a 132-150 version, but the USA versions I have here are
rated 146-174MHz. I know the Micors are band-split for VHF, but from
what I read in the MSR manuals, I think there is only one 146-174
slpit MSR, no?


I have a number of 146-174 MSRs that I brought down from 158-160
range down to 146.xxx for ham repeaters, and they all worked
flawlessly.  Both, original base units converted to repeaters, as
well as original repeaters. Even at high RF sites. I've never had an
issue with a base station (which lacks the additional i/o filter
daughtherboard present in the repeater versions).

Sounds like either a mistuned exciter which is generating a lot of
white noise close to the rx freq, or a mistuned oscillator/multiplier
in the receiver.  I've seen this happen on Mitreks before.

I'm guessing you removed the original audio and keying paths on the
Squelch Gate card before adding the NHRC controllers?

Eric
KE2D



--- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <[EMAIL PROTECTED]>
wrote:
>
> Tom,
>
> The VHF MSR2000 stations generally come in one of three splits:
132-150.8,
> 150.8-162, and 162-174 MHz.  Some of the symptoms you describe
result from
> operating the exciter, harmonic filter, and PA outside of the band
they were
> made for.
>
> What modifications were done to move them from the commercial band
to 2m?
> What are the numbers stamped on the transmitter components?
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of tomnevue
> Sent: Sunday, April 22, 2007 3:25 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Need VHF MSR2000 Repeater help
>
> I have 2 VHF MSR2000 Repeaters that I'm building up at the same
> time. Both units have the same problem and I'm hoping someone with
> MSR2000 experience can give me a suggestion on where to look next.
>
> I'm having a terrible time with receiver desensing, transmitter
> hanging on and audio oscillations (intermittent/random growling).
> I've been thru separate antennas, duplexer with better than 90dB
> notch, separate antenna with duplexer + extra cavity. If I run the
> duplexer antenna port into a dummy load, the problem is less but
> still there. If I run the transmitter port directly into a dummy
load
> or if I turn the PA power down to about 4 watts (with
> duplexer/antenna connected)the problem is gone. I've replaced the
> repeater/duplexer jumpers with good double shielded coax and ground
> strapped the repeater/duplexer cabinet together. I've made sure all
> of the original repeater panels are in place. The problems exist
with
> the controller in place and also with a test connector replacing it.
>

> One of these was a full working repeater in public service use and
> the other was a convertable base station. Both have the 110watt PA
> that I am running at 50 watts. The controllers are NHRC-2 connected
> to the Squelch Gate card using the procedure described by Skipp
May.
> The 12 inch interconnecting cables use shielded audio in/out cables
> and COS/PTT wires are not shielded. The controllers are enclosed in
> aluminum boxes.
>
> HELP !!!
>
> Tom W2MN
>







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Re: [Repeater-Builder] CAT-1000 Controller - Audio Response Change

[w5zit]

Most of the CAT controllers that I have delt with have no provision for 
deemphasizing the audio in the controller. You can not feed 
discriminator audio directly into them without using a de-emphasis 
circuit in the audio path. One way is to take the discriminator audio 
through a 15K series resistor with a .22 mFd cap to ground on the 
output side of the resistor and feed that into the CAT receiver audio 
terminal. That should give you flat audio for the TT decoder to see and 
good sounding audio on the repeater output.

73 - Jim W5ZIT

-Original Message-
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sun, 22 Apr 2007 7:34 PM
Subject: Re: [Repeater-Builder] CAT-1000 Controller - Audio Response 
Change

On a CAT? I'm not sure that's possible.
You may end up changing the entire audio path. ;->

Joe M.

Tony L. wrote:
>
> Does anyone know how would I go about changing the audio response on a
> CAT-1000 controller? I'm seeking to make the audio "flat."
>
> Thanks.

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[Repeater-Builder] Re: Need VHF MSR2000 Repeater help

[kk2ed]

I have a bunch of MSR2000s here. I know the Canadian version was 
offered as a 132-150 version, but the USA versions I have here are 
rated 146-174MHz. I know the Micors are band-split for VHF, but from 
what I read in the MSR manuals, I think there is only one 146-174 
slpit MSR, no?


I have a number of 146-174 MSRs that I brought down from 158-160 
range down to 146.xxx for ham repeaters, and they all worked 
flawlessly.  Both, original base units converted to repeaters, as 
well as original repeaters. Even at high RF sites. I've never had an 
issue with a base station (which lacks the additional i/o filter 
daughtherboard present in the repeater versions).

Sounds like either a mistuned exciter which is generating a lot of 
white noise close to the rx freq, or a mistuned oscillator/multiplier 
in the receiver.  I've seen this happen on Mitreks before.

I'm guessing you removed the original audio and keying paths on the 
Squelch Gate card before adding the NHRC controllers?

Eric
KE2D



--- In Repeater-Builder@yahoogroups.com, "Eric Lemmon" <[EMAIL PROTECTED]> 
wrote:
>
> Tom,
> 
> The VHF MSR2000 stations generally come in one of three splits:  
132-150.8,
> 150.8-162, and 162-174 MHz.  Some of the symptoms you describe 
result from
> operating the exciter, harmonic filter, and PA outside of the band 
they were
> made for.
> 
> What modifications were done to move them from the commercial band 
to 2m?
> What are the numbers stamped on the transmitter components?
> 
> 73, Eric Lemmon WB6FLY
>  
> 
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:[EMAIL PROTECTED] On Behalf Of tomnevue
> Sent: Sunday, April 22, 2007 3:25 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Need VHF MSR2000 Repeater help
> 
> I have 2 VHF MSR2000 Repeaters that I'm building up at the same 
> time. Both units have the same problem and I'm hoping someone with 
> MSR2000 experience can give me a suggestion on where to look next.
> 
> I'm having a terrible time with receiver desensing, transmitter 
> hanging on and audio oscillations (intermittent/random growling). 
> I've been thru separate antennas, duplexer with better than 90dB 
> notch, separate antenna with duplexer + extra cavity. If I run the 
> duplexer antenna port into a dummy load, the problem is less but 
> still there. If I run the transmitter port directly into a dummy 
load 
> or if I turn the PA power down to about 4 watts (with 
> duplexer/antenna connected)the problem is gone. I've replaced the 
> repeater/duplexer jumpers with good double shielded coax and ground 
> strapped the repeater/duplexer cabinet together. I've made sure all 
> of the original repeater panels are in place. The problems exist 
with 
> the controller in place and also with a test connector replacing it.
> 

> One of these was a full working repeater in public service use and 
> the other was a convertable base station. Both have the 110watt PA 
> that I am running at 50 watts. The controllers are NHRC-2 connected 
> to the Squelch Gate card using the procedure described by Skipp 
May. 
> The 12 inch interconnecting cables use shielded audio in/out cables 
> and COS/PTT wires are not shielded. The controllers are enclosed in 
> aluminum boxes. 
> 
> HELP !!!
> 
> Tom W2MN
>

[Repeater-Builder] Re: Need VHF MSR2000 Repeater help

[skipp025]

Right at the start of my conversion information I mention you 
should begin with the repeater working well at the original 
frequency. I probably should include the advice to do the 
frequency conversion first before you do my or anyone's modification. 
Just so you know you are not fighting multiple gremlins. 

Per the post by Eric... it's probably a good idea that you supply 
the Model number(s).  The printed model numbers direct off the 
Receiver and Transmitter Modules as well as the RF Amplifier. 
The cabinet model number is pretty much a must have to know the 
entire package. 

Another thought... when you moved the rf units down to the ham 
band... did you realign them from their last positions or did you 
start the realignment after placing the coils at the manual chart 
position (yeah it does make a difference)? 

If you did my mod with the DB-9 type jack option... you could 
easily make a matching plug to restore the unit to near stock 
operation while you figure out what's going on. 

Sometimes you find receivers and transmitter strips without the 
duplex filter networks on/near the tx/rx module end connectors. But 
I've run both the duplex and base station (only) tx/rx modules 
as repeaters with nary a squawk. 

Also... with your PA output reduced... cable direct from the PA 
output jack (not the cabinet jack) direct to a termination (load) 
while you're testing. Do you have the problem when going direct 
from the pa output to a termination (not using the cabinet internal 
duplex cables)? 

During conversion mods... people often tie wrap cables in a bunch 
to make a clean install.  Combined tx/rx coax cables are often a 
potential source of trouble.  What kind of coax did you use to make 
the in cabinet rf cables? 

skipp 

> "tomnevue" <[EMAIL PROTECTED]> wrote:
>
> I have 2 VHF MSR2000 Repeaters that I'm building up at the same 
> time.  Both units have the same problem and I'm hoping someone with 
> MSR2000 experience can give me a suggestion on where to look next.
> 
> I'm having a terrible time with receiver desensing, transmitter 
> hanging on and audio oscillations (intermittent/random growling).  
> I've been thru separate antennas, duplexer with better than 90dB 
> notch, separate antenna with duplexer + extra cavity. If I run the 
> duplexer antenna port into a dummy load, the problem is less but 
> still there. If I run the transmitter port directly into a dummy load 
> or if I turn the PA power down to about 4 watts (with 
> duplexer/antenna connected)the problem is gone. I've replaced the 
> repeater/duplexer jumpers with good double shielded coax and ground 
> strapped the repeater/duplexer cabinet together. I've made sure all 
> of the original repeater panels are in place. The problems exist with 
> the controller in place and also with a test connector replacing it.
> 
> One of these was a full working repeater in public service use and 
> the other was a convertable base station. Both have the 110watt PA 
> that I am running at 50 watts.  The controllers are NHRC-2 connected 
> to the Squelch Gate card using the procedure described by Skipp May. 
> The 12 inch interconnecting cables use shielded audio in/out cables 
> and COS/PTT wires are not shielded. The controllers are enclosed in 
> aluminum boxes. 
> 
> HELP !!!
> Tom  W2MN
>

[Repeater-Builder] Re: Sinclair Q202 tuning problem

[kk2ed]

Guys,

Thanks for the replies.  I guess once I downloaded the manual and 
studied the cabling diagrams, I now understand what you all were 
saying about the cables attached directly to the cavities. The 
original cables were 11.5 inches on low side, and 10.5 inches on the 
high side. The high side tuned fine (pass & reject), but the low 
side's reject would not pull to the high side of the pass frequency.

I added a few M-M and F-F barrel adapters to lengthen the cables, and 
the reject tuned perfectly.  My cable lengths with the adapters ended 
up being around 12.5 inches for the low side. A little longer than 
what the Sinclair notes called for.

Being the original cables were made from RG213, which in my opinion 
is a no-no with duplexers, I decided to make two new cables out of 
RG393 thermax double silver shielded cable.  I first tried making the 
cables the length above of 12.5 inches, but the cables turned out to 
be too short. Same results as the original RG213 10.5 inch cables. 
Added the adapters back to the new jumpers, and tuning was good 
again. I then made another RG393 jumper about 15 inches, but then it 
was too long, and the reject tuning rods wound up being out too 
much.  I then shortened the cables to 14.25 inches, and the rods 
tuned perfectly.  I then made two more cables for the tx(high) side, 
but once again, too long, so I needed to shorten the high side RG393 
jumpers to 13.25 inches. I'm guessing the RG393's velocity factor is 
the issue behing the cables having to be physically longer than the 
RG213 cables for the same frequency.

Thanks again for all the suggestions.

Eric
KE2D



--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
>
> Eric, I had the identical issue with this duplexer. Eric Lemmon 
helped 
> me solve the problem by commenting that the arrangement that 
Sinclair 
> uses has a reject notch on both sides of the cavity resonance. A 
sweep 
> of the cavity will show the two notches that can be moved in unison 
> around the pass, with both notches moving the same direction as the 
> stub is adjusted.
> 
> What you are missing is that the first piece of cable from each 
cavity 
> to the Tee is part of the tuned circuit. My cavities were in the 
170.xx 
> range and the first cables were 10.5 inches. I increased the first 
> cables from the cavity on the lower side from 10.5 to 12.5 inches 
and 
> they tuned just fine in the ham band.
> 
> Eric scanned the manual for my duplexer and I can send you a copy 
if 
> you are interested.
> 
> 73 - Jim W5ZIT
> 
> -Original Message-
> From: [EMAIL PROTECTED]
> To: Repeater-Builder@yahoogroups.com
> Sent: Sat, 21 Apr 2007 10:31 PM
> Subject: [Repeater-Builder] Sinclair Q202 tuning problem
> 
> I am having an issue tuning a Q202 duplexer. I reviewed the past 144
> or so posts regarding Q202 issues, but haven't found any past posts
> mentioning the following issue.
> 
> The unit was originally on 165MHz. It has the horizontal
> copper/dielectric reject stubs which screw into the T-box on top of
> the cavities.
> 
> The target frequencies are 146.800 tx, 146.200 rx. The high side
> (tx)tunes just fine. I'm measuring about 1.5db insertion loss and
> 80db rejection on the tracking generator. The low side is the issue.
> 
> The pass (146.200) tunes just fine, with 1.5db or so of insertion
> loss, but reject is an issue. The cavities on the low side act as if
> they are another set of high-side cans. The reject rods appear to
> tune properly, and I can get 80+db of rejection 600KHz low of
> 146.200, but no matter what I do, the reject will never go ABOVE the
> pass frequency.
> 
> I doubt the cable harness lengths would cause this, no? From the 
past
> posts I read, it sounds like if I were running out of room on the
> reject rods, then the cable lenghts might be the issue. But my issue
> is that the low side's reject is sitting below the pass, not above
> the pass where it needs to be.
> 
> The duplexer swept ok before I started retuning it.
> 
> Any ideas? Would being an inch or so short on the L cables at the
> new frequencies really cause the reject to be on the wrong side of
> the pass, just on the low side only? The high-pass side tunes fine,
> allthough the clear rods are only out of the copper tubes by about 
1"
> or so.
> 
> Thanks
> Eric
> KE2D
> 
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[Repeater-Builder] Re: REPCO 2 watt vhf transmitter strip- info request

[skipp025]

Re: REPCO  2 watt vhf transmitter strip- info request

Bob..!  you "nice guy" you!  I've also been looking for the 
VHF Manual for some time. I'd pay you some type of a big bribe
to make copies for me/us.  I will of course scan them into a
pdf file (if not received as scans) and pass copies into to 
Mike and anyone who asks for free. 

I already have the UHF/900 RDL Manual scanned (copes in pdf format 
available free to anyone) and would really... really like to 
get my hands on a copy of the VHF Manual/information. 

So... is is possible to bribe you for a copy of at least 
the VHF Manual? 

Skipp 
skipp025 at yahoo.com 

> [EMAIL PROTECTED] wrote:
> Hi Art,
>  
> Have you found the data you were looking for? If not, I might be
able to  
> help. I found manuals for both the VHF and UHF Repco receivers and 
transmitters 
> in the S-COM archives. They're referred to as the RDL series of RF 
Link 
> Devices, and apparently there were both voice and data versions. We
 had some of 
> the data-only TX strips years ago, so W0INK designed  a 
> pre-emphasis/limiting/filtering circuit to use them for voice operation.
>  
> The manuals are copies of copies and are a little rough in spots.
>  
> Mike/ILQ: Interested in posting them on Repeater-Builder?
>  
> 73,
> Bob
>  
> Bob Schmid,  WA9FBO, Member
> S-COM, LLC
> PO Box 1546
> LaPorte CO  80535-1546
> 970-416-6505 voice
> 970-419-3222  fax
> www.scomcontrollers.com
>  
> In a message dated 4/18/2007 1:57:38 PM Mountain Daylight Time,  
> [EMAIL PROTECTED] writes:
> 
> Recently a member posted some info about this 2 watt vhf board being  
> available on Ebay. I obtained 8 of these boards for experimentation.  
> They are marked RD*3HT**X date of 2-83 and appear new and unused.  
> Indicated tested at 154.570 (no crystal installed). Wondering if  
> anyone might have some documetation or scematic or pinout that might  
> help in putting this board into an amateur radio project. Would gladly  
> share experience with this board with anyone. The board is high  
> quality and may be ideal in a small size vhf project. Thanks in  
> advance. Can contact off list at [EMAIL PROTECTED] 
> (mailto:[EMAIL PROTECTED]) . Art  Carlson
> 
> 
> 
> 
> 
> 
> 
> 
> ** See what's free at
http://www.aol.com.
>

[Repeater-Builder] Cushman Service Monitor Repair

[Randy]

I have a Cushman Field Service Monitor that has a couple things not
working right.  Anyone know of a reliable shop that services these old
Cushmans?

Re: [Repeater-Builder] Repeater Dream List

[rande]

The MTR2000 has been a good repeater for us too.

Just be prepared for the $1200.00 flat rate repair when it's out of 
warranty.  I've been told there are no field serviceable parts for the 
MTR2000 unless you have a boneyard or spare to pull from.

Randy



Eric Lemmon wrote:
>
> Brian,
>
> My recommendation is the Motorola MTR2000. I have three of these units in
> Amateur service, and two in commercial service, with a third to be added
> very soon. The MTR2000 is a high-tier station that is built for continuous
> duty at full power. One of my UHF stations is only 100 feet or so from a 5
> megawatt ARSR-4 radar, and it is not affected. Of course, it does have two
> 8" bandpass cavities and an Angle Linear preamp downstream of the 
> six-cavity
> duplexer. More info here:
>
> 
>
> Here's my shopping list for your repeater:
>
> T5544 (or T5766) MTR2000 station
> X540 ENH: UHF 100W 435-470 MHz Operation, includes integral circulator
> X597 ENH: Conventional Analog System Software (this is NOT the programming
> software)
> X580 ADD: Repeater Operation
> X182 ADD: Factory Tuned Duplexer TLE9022, similar to Celwave PD526-4-2)
> X84 DEL: Wireline Operation (Deleted, saves $200)
> X308 ADD: Indoor Cabinet 46"
> RVN4148 Radio Servicing Software (RSS)
> 3082056X02 Programming Cable
> GMN6147 Station Test Microphone
> HSN1000 Station Test Speaker, amplified
> 0185180U01 Cable to connect speaker to station
> 6881096E25 UHF MTR2000 Field Service Manual
>
> The above equipment will eat up a good part of a $10,000 bill, but will
> perform nearly the same as a Quantar at about half the cost. The 
> MTR2000 is
> a modular design, and repairs are quickly made by exchanging FRUs (Field
> Replaceable Units). Armed with nothing more than a T20 Torx screwdriver,
> the station control module, exciter, or receiver can be swapped out in 
> about
> five minutes- without removing the station from the rack!
>
> Be certain that you require 100 watts RF output, and the 40 watt model 
> will
> not suffice. The higher power station will cost some $600 more up front,
> and the higher-rated PA and power supply modules are much more 
> expensive if
> replacement is required. Also, the 100W station requires 28 VDC backup
> power, should you add the Argus Battery Reverting Charger. The 40W station
> runs on 14 VDC, and I can show you how to hook up a backup battery without
> the expensive Argus unit.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> 
> [mailto:Repeater-Builder@yahoogroups.com 
> ] On Behalf Of 
> [EMAIL PROTECTED] 
> Sent: Sunday, April 22, 2007 6:14 AM
> To: Repeater-Builder@yahoogroups.com 
> ; 
> [EMAIL PROTECTED] 
> Subject: [Repeater-Builder] Repeater Dream List
>
> Hi All!
>
> Here is a tough problem. A high ranking official in Law enforcement has
> approach me to recommend equipment for a UHF repeater to be used by 
> hams to
> back up to local police/public safety. He sounds like he has deep pockets,
> the money sounds like it is coming from 9/11 inter-agency type funds. This
> will be used in the ham bands.
>
> Being a Micor junkie, and not really keeping up with newer technology 
> (newer
> than 1985!! hi hi!!) what should I be looking at for him.
>
> The antenna will be a DB420, Andrew heliax, and radio should be 
> Motorola ...
> (we are in Chicago, Moto Country!)
>
> With that in mind, we are looking in the 50 - 100 watt range.
>
> Thanks, Brian, WD9HSY
>
> 
> 
>
> No virus found in this incoming message.
> Checked by AVG Free Edition. 
> Version: 7.5.463 / Virus Database: 269.5.7/771 - Release Date: 4/21/2007 
> 11:56 AM
>   

[Repeater-Builder] Antennas

[wa4yog]

Greatings:

I am looking for a frequency cutting chart for
an ASPS-685 two meter and an ASP-705 uhf (Antenna Specialist)

  Thank You.

[Repeater-Builder] 470 MHz Filter

[sms mms]

Dear Sir,
  Please guide me how to construct 470 MHz Filter.
  Thanks in advance.
  vikash gupta
   
   

   
-
 Check out what you're missing if you're not on Yahoo! Messenger 

[Repeater-Builder] I am looking for Micor parts

[Jeff Regan - - NJ5R]

My name is Jeff, NJ5R. I am new to this group.  I need help locating a
kxn1052 and a kxn1024 channel element for my 'new' micor repeater. 73

Jeff

Re: [Repeater-Builder] CAT-1000 Controller - Audio Response Change

[mch]

On a CAT? I'm not sure that's possible.
You may end up changing the entire audio path. ;->

Joe M.

Tony L. wrote:
> 
> Does anyone know how would I go about changing the audio response on a
> CAT-1000 controller?  I'm seeking to make the audio "flat."
> 
> Thanks.

Re: [Repeater-Builder] REPCO 2 watt vhf transmitter strip- info request

[scomind]

 
Hi Art,
 
Have you found the data you were looking for? If not, I might be able to  
help. I found manuals for both the VHF and UHF Repco receivers and  
transmitters 
in the S-COM archives. They're referred to as the RDL series of RF  Link 
Devices, and apparently there were both voice and data versions. We  had some 
of 
the data-only TX strips years ago, so W0INK designed  a 
pre-emphasis/limiting/filtering circuit to use them for voice operation.
 
The manuals are copies of copies and are a little rough in spots.
 
Mike/ILQ: Interested in posting them on Repeater-Builder?
 
73,
Bob
 
Bob Schmid,  WA9FBO, Member
S-COM, LLC
PO Box 1546
LaPorte CO  80535-1546
970-416-6505 voice
970-419-3222  fax
www.scomcontrollers.com
 
In a message dated 4/18/2007 1:57:38 PM Mountain Daylight Time,  
[EMAIL PROTECTED] writes:

Recently a member posted some info about this 2 watt vhf board being  
available on Ebay. I obtained 8 of these boards for experimentation.  
They are marked RD*3HT**X date of 2-83 and appear new and unused.  
Indicated tested at 154.570 (no crystal installed). Wondering if  
anyone might have some documetation or scematic or pinout that might  
help in putting this board into an amateur radio project. Would gladly  
share experience with this board with anyone. The board is high  
quality and may be ideal in a small size vhf project. Thanks in  
advance. Can contact off list at [EMAIL PROTECTED] 
(mailto:[EMAIL PROTECTED]) . Art  Carlson








** See what's free at http://www.aol.com.

Re: [Repeater-Builder] Need VHF MSR2000 Repeater help

[Scott]

Have you run your duplexer and antenna system successfully with another 
radio---i.e.., no desense etc.?

If yes---probably radio trouble.

If noThere are lots of possibilities

Check the duplexer first--Put a dummy load on in place of the antenna and 
an iso-tee in the receiver input feed. Set up a weak (threshold) signal into 
the receiver and turn the transmitter on and off. Does the transmitter desense 
the receiver-It should not up to the maximum power that you are going to 
operate at. 

If it doesn't, you probably have antenna or antenna feedline trouble.

If it does, you have duplexer trouble---be sure that your jumper cables are all 
good..

Check the duplexer tuning firstcommon subject here. If you are satisfied 
that the unit is tuned properly and it's performance is adequate there is 
another possibility and it is bad news.

Is there a possibility that the duplexer pass band adjuster has been moved with 
transmitter power applied or has it been out of service for years and possibly 
damp? What can happen is that the typically silver to silver connection between 
the fixed  and movable parts of the center post have been burn't or corroded. 
The effect is the sametransmitter power results in rectification at the bad 
connection and wide band noise is produced and lots of it which puts enough 
energy on the receive frequency and desense  occursin spite of the duplexer 
looking perfect on all fancy instrumentation. The more transmitter power, the 
more noise and desense. And sometimes desense quits below some low power and 
everything works properly. 

How do I know about this? I have two Phelps-Dodge VHF duplexers that test 
perfectly that are unusable in repeater service.

Scott









  - Original Message - 
  From: tomnevue 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, April 22, 2007 2:25 PM
  Subject: [Repeater-Builder] Need VHF MSR2000 Repeater help


  I have 2 VHF MSR2000 Repeaters that I'm building up at the same 
  time. Both units have the same problem and I'm hoping someone with 
  MSR2000 experience can give me a suggestion on where to look next.

  I'm having a terrible time with receiver desensing, transmitter 
  hanging on and audio oscillations (intermittent/random growling). 
  I've been thru separate antennas, duplexer with better than 90dB 
  notch, separate antenna with duplexer + extra cavity. If I run the 
  duplexer antenna port into a dummy load, the problem is less but 
  still there. If I run the transmitter port directly into a dummy load 
  or if I turn the PA power down to about 4 watts (with 
  duplexer/antenna connected)the problem is gone. I've replaced the 
  repeater/duplexer jumpers with good double shielded coax and ground 
  strapped the repeater/duplexer cabinet together. I've made sure all 
  of the original repeater panels are in place. The problems exist with 
  the controller in place and also with a test connector replacing it.

  One of these was a full working repeater in public service use and 
  the other was a convertable base station. Both have the 110watt PA 
  that I am running at 50 watts. The controllers are NHRC-2 connected 
  to the Squelch Gate card using the procedure described by Skipp May. 
  The 12 inch interconnecting cables use shielded audio in/out cables 
  and COS/PTT wires are not shielded. The controllers are enclosed in 
  aluminum boxes. 

  HELP !!!

  Tom W2MN



   

Re: [Repeater-Builder] Seeking feed thru' cap value.

[no6b]

At 4/22/2007 12:21, you wrote:
>What value of cap should be used as a minimum for TX RX controller
>inter-connection. 1000pf, 5000pf?
>
>Doug - GM7SVK

Jeff's answer completely & accurately answers the question; I can only 
offer my personal choices of filter types & values.

For any DC supply lines, I use L-C or pi=network EMI filters.  They're 
essentially brick wall filters at RF (-70 dB).  Only problem is the shunt 
capacitance of these filters is usually too high to use on any non-DC 
signals.  For those I use 1000 or 5000 pF feedthru caps with a small value 
of series resistance to assure that the cap can shunt enough stray 
RF.  Series coils or beads are a good idea too but I worry about the 1% 
possibility of a series resonance occurring right at the frequency that 
needs to be blocked.  OTOH a carbon resistor should maintain its resistive 
properties up to at least 500 MHz.

Bob NO6B

[Repeater-Builder] CAT-1000 Controller - Audio Response Change

[Tony L.]

Does anyone know how would I go about changing the audio response on a 
CAT-1000 controller?  I'm seeking to make the audio "flat."

Thanks. 

RE: [Repeater-Builder] Need VHF MSR2000 Repeater help

[Eric Lemmon]

Tom,

The VHF MSR2000 stations generally come in one of three splits:  132-150.8,
150.8-162, and 162-174 MHz.  Some of the symptoms you describe result from
operating the exciter, harmonic filter, and PA outside of the band they were
made for.

What modifications were done to move them from the commercial band to 2m?
What are the numbers stamped on the transmitter components?

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of tomnevue
Sent: Sunday, April 22, 2007 3:25 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Need VHF MSR2000 Repeater help

I have 2 VHF MSR2000 Repeaters that I'm building up at the same 
time. Both units have the same problem and I'm hoping someone with 
MSR2000 experience can give me a suggestion on where to look next.

I'm having a terrible time with receiver desensing, transmitter 
hanging on and audio oscillations (intermittent/random growling). 
I've been thru separate antennas, duplexer with better than 90dB 
notch, separate antenna with duplexer + extra cavity. If I run the 
duplexer antenna port into a dummy load, the problem is less but 
still there. If I run the transmitter port directly into a dummy load 
or if I turn the PA power down to about 4 watts (with 
duplexer/antenna connected)the problem is gone. I've replaced the 
repeater/duplexer jumpers with good double shielded coax and ground 
strapped the repeater/duplexer cabinet together. I've made sure all 
of the original repeater panels are in place. The problems exist with 
the controller in place and also with a test connector replacing it.

One of these was a full working repeater in public service use and 
the other was a convertable base station. Both have the 110watt PA 
that I am running at 50 watts. The controllers are NHRC-2 connected 
to the Squelch Gate card using the procedure described by Skipp May. 
The 12 inch interconnecting cables use shielded audio in/out cables 
and COS/PTT wires are not shielded. The controllers are enclosed in 
aluminum boxes. 

HELP !!!

Tom W2MN

[Repeater-Builder] Need VHF MSR2000 Repeater help

[tomnevue]

I have 2 VHF MSR2000 Repeaters that I'm building up at the same 
time.  Both units have the same problem and I'm hoping someone with 
MSR2000 experience can give me a suggestion on where to look next.

I'm having a terrible time with receiver desensing, transmitter 
hanging on and audio oscillations (intermittent/random growling).  
I've been thru separate antennas, duplexer with better than 90dB 
notch, separate antenna with duplexer + extra cavity. If I run the 
duplexer antenna port into a dummy load, the problem is less but 
still there. If I run the transmitter port directly into a dummy load 
or if I turn the PA power down to about 4 watts (with 
duplexer/antenna connected)the problem is gone. I've replaced the 
repeater/duplexer jumpers with good double shielded coax and ground 
strapped the repeater/duplexer cabinet together. I've made sure all 
of the original repeater panels are in place. The problems exist with 
the controller in place and also with a test connector replacing it.

One of these was a full working repeater in public service use and 
the other was a convertable base station. Both have the 110watt PA 
that I am running at 50 watts.  The controllers are NHRC-2 connected 
to the Squelch Gate card using the procedure described by Skipp May. 
The 12 inch interconnecting cables use shielded audio in/out cables 
and COS/PTT wires are not shielded. The controllers are enclosed in 
aluminum boxes. 

HELP !!!


Tom  W2MN

RE: [Repeater-Builder] Seeking feed thru' cap value.

[Jeff DePolo]

There's no easy answer to that question.  The two biggest factors to
consider when selecting the right value are:

a) What frequency range are you trying to filter out?  If your problem is
keeping an AM broadcast station out, you'll need larger values as compared
to targeting your own VHF/UHF emissions.

b) What is the source Z of the signal(s) being passed?  As the Z goes up,
you'll typically want less C lest you have roll-off problems in audio
circuits, "round off" of square-wave digital waveforms (generally not a good
idea to be filtering high speed digital circuits in this manner), etc.  If
the Z is fairly low, and if you're only dealing with AF and on/off logic
signals (COR, PTT, etc.), this becomes less of an issue.  But you should
still do the math before picking a value.

Feedthru caps are but one tool for fighting RF ingress.  The cap needs some
L or R to "work against" if it is to serve as part of a low-pass LC or RC
circuit.  Ferrite beads (of the approximate mix for the targeted frequency
ranges) and/or chokes may come into play as well.  Take a look at the
filtering on a fully-fitered Micor unified chassis station to get an idea of
Mother Mo's take on the subject.  IIRC, on the receiver interconnect there
are two feedthru caps (1000 pF?) with a choke between them on most, if not
all, circuits to/from the backplane.  I don't remember if all bands/models
used the same values for caps and chokes, maybe somebody else does.

--- Jeff

> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:[EMAIL PROTECTED] On Behalf Of Doug Hutchison
> Sent: Sunday, April 22, 2007 3:21 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Seeking feed thru' cap value.
> 
> What value of cap should be used as a minimum for TX RX controller 
> inter-connection. 1000pf, 5000pf?
> 
> Doug - GM7SVK
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 269.5.7/771 - Release 
> Date: 4/21/2007 11:56 AM
>  
> 

Re: [Repeater-Builder] Sinclair Q202 tuning problem

[Jack Taylor]

Jim, I have a couple of Q202G's that most likely could be restored.  Would 
appreciate
a copy of the manual.

73 de Jack - N7OO   ([EMAIL PROTECTED])
  - Original Message - 
  From: [EMAIL PROTECTED] 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Sunday, April 22, 2007 9:39 AM
  Subject: Re: [Repeater-Builder] Sinclair Q202 tuning problem


  Eric, I had the identical issue with this duplexer. Eric Lemmon helped 
  me solve the problem by commenting that the arrangement that Sinclair 
  uses has a reject notch on both sides of the cavity resonance. A sweep 
  of the cavity will show the two notches that can be moved in unison 
  around the pass, with both notches moving the same direction as the 
  stub is adjusted.

  What you are missing is that the first piece of cable from each cavity 
  to the Tee is part of the tuned circuit. My cavities were in the 170.xx 
  range and the first cables were 10.5 inches. I increased the first 
  cables from the cavity on the lower side from 10.5 to 12.5 inches and 
  they tuned just fine in the ham band.

  Eric scanned the manual for my duplexer and I can send you a copy if 
  you are interested.

  73 - Jim W5ZIT

  -Original Message-
  From: [EMAIL PROTECTED]
  To: Repeater-Builder@yahoogroups.com
  Sent: Sat, 21 Apr 2007 10:31 PM
  Subject: [Repeater-Builder] Sinclair Q202 tuning problem

  I am having an issue tuning a Q202 duplexer. I reviewed the past 144
  or so posts regarding Q202 issues, but haven't found any past posts
  mentioning the following issue.

  The unit was originally on 165MHz. It has the horizontal
  copper/dielectric reject stubs which screw into the T-box on top of
  the cavities.

  The target frequencies are 146.800 tx, 146.200 rx. The high side
  (tx)tunes just fine. I'm measuring about 1.5db insertion loss and
  80db rejection on the tracking generator. The low side is the issue.

  The pass (146.200) tunes just fine, with 1.5db or so of insertion
  loss, but reject is an issue. The cavities on the low side act as if
  they are another set of high-side cans. The reject rods appear to
  tune properly, and I can get 80+db of rejection 600KHz low of
  146.200, but no matter what I do, the reject will never go ABOVE the
  pass frequency.

  I doubt the cable harness lengths would cause this, no? From the past
  posts I read, it sounds like if I were running out of room on the
  reject rods, then the cable lenghts might be the issue. But my issue
  is that the low side's reject is sitting below the pass, not above
  the pass where it needs to be.

  The duplexer swept ok before I started retuning it.

  Any ideas? Would being an inch or so short on the L cables at the
  new frequencies really cause the reject to be on the wrong side of
  the pass, just on the low side only? The high-pass side tunes fine,
  allthough the clear rods are only out of the copper tubes by about 1"
  or so.

  Thanks
  Eric
  KE2D
  __
  Check Out the new free AIM(R) Mail -- 2 GB of storage and 
  industry-leading spam and email virus protection.


   

[Repeater-Builder] Seeking feed thru' cap value.

[Doug Hutchison]

What value of cap should be used as a minimum for TX RX controller 
inter-connection. 1000pf, 5000pf?

Doug - GM7SVK

RE: [Repeater-Builder] Repeater Dream List

[Eric Lemmon]

Brian,

My recommendation is the Motorola MTR2000.  I have three of these units in
Amateur service, and two in commercial service, with a third to be added
very soon.  The MTR2000 is a high-tier station that is built for continuous
duty at full power.  One of my UHF stations is only 100 feet or so from a 5
megawatt ARSR-4 radar, and it is not affected.  Of course, it does have two
8" bandpass cavities and an Angle Linear preamp downstream of the six-cavity
duplexer.  More info here:



Here's my shopping list for your repeater:

T5544 (or T5766)  MTR2000 station
X540  ENH:  UHF 100W 435-470 MHz Operation, includes integral circulator
X597  ENH:  Conventional Analog System Software (this is NOT the programming
software)
X580  ADD:  Repeater Operation
X182  ADD:  Factory Tuned Duplexer TLE9022, similar to Celwave PD526-4-2)
X84   DEL:  Wireline Operation (Deleted, saves $200)
X308  ADD:  Indoor Cabinet 46"
RVN4148  Radio Servicing Software (RSS)
3082056X02  Programming Cable
GMN6147  Station Test Microphone
HSN1000  Station Test Speaker, amplified
0185180U01  Cable to connect speaker to station
6881096E25  UHF MTR2000 Field Service Manual

The above equipment will eat up a good part of a $10,000 bill, but will
perform nearly the same as a Quantar at about half the cost.  The MTR2000 is
a modular design, and repairs are quickly made by exchanging FRUs (Field
Replaceable Units).  Armed with nothing more than a T20 Torx screwdriver,
the station control module, exciter, or receiver can be swapped out in about
five minutes- without removing the station from the rack!

Be certain that you require 100 watts RF output, and the 40 watt model will
not suffice.  The higher power station will cost some $600 more up front,
and the higher-rated PA and power supply modules are much more expensive if
replacement is required.  Also, the 100W station requires 28 VDC backup
power, should you add the Argus Battery Reverting Charger.  The 40W station
runs on 14 VDC, and I can show you how to hook up a backup battery without
the expensive Argus unit.

73, Eric Lemmon WB6FLY
  

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Sunday, April 22, 2007 6:14 AM
To: Repeater-Builder@yahoogroups.com; [EMAIL PROTECTED]
Subject: [Repeater-Builder] Repeater Dream List

Hi All!
 
Here is a tough problem.  A high ranking official in Law enforcement has
approach me to recommend equipment for a UHF repeater to be used by hams to
back up to local police/public safety.  He sounds like he has deep pockets,
the money sounds like it is coming from 9/11 inter-agency type funds. This
will be used in the ham bands.
 
Being a Micor junkie, and not really keeping up with newer technology (newer
than 1985!! hi hi!!)  what should I be looking at for him.
 
The antenna will be a DB420, Andrew heliax, and radio should be Motorola ...
(we are in Chicago, Moto Country!)
 
With that in mind, we are looking in the 50 - 100 watt range.
 
Thanks, Brian, WD9HSY

Re: [Repeater-Builder] Service Monitors with D-Star

[Steve Bosshard (NU5D)]

General best to look at the eye pattern on the receiver.  Steve

I am just getting started with Dstar - have worked Pro Voice and Aegis for a
while.  sb

On 4/22/07, skipp025 <[EMAIL PROTECTED]> wrote:


> "Nate Duehr" <[EMAIL PROTECTED]> wrote:
> how are people testing/working on their D-Star systems?
> I can't think of a single SM that knows how to do bit-error
> rates and/or other AMBE vocoder functions.

The fudge answer is...  most people just connect the equipment
and press the go (power on) button.

skipp





--
Ham Radio Spoken Here.NU5D
Nickel Under Five Dollars

Re: [Repeater-Builder] Service Monitors

[w5zit]

Jack, I used an older Bearcat hand-held scanner as a signal generator 
for years. It has a 10.8 mHz IF and you can calculate the offset 
frequency that has to be entered in the scanner to give you the 
frequency you want. To prevent stray radiation and provide a means of 
attenuating it, I program it and then put it in a cake pan with an 
aluminum flashing cover that I fabricated, and put in-line attenuators 
on the feed through BNC on the cake pan. Just used the source as the 
normal receive input for the scanner, as it had plenty of radiated LO 
from the antenna connector.

That served me through the '70s and '80s until something better came 
along ( an analog Motorola signal generator ) I still use the Motorola 
to tune duplexers, as it has a better shielded generator than the 
service monitor I use. I use an Icom hand-held as the receiver for 
duplexer tuning, as it works quite well as long as there is zero 
radiation from the signal source.

73 - Jim W5ZIT

-Original Message-
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sat, 21 Apr 2007 9:20 PM
Subject: Re: [Repeater-Builder] Service Monitors



I suspect the accuracy of the deviation measurement depends on how the 
scope is calibrated.
I too have for many years used a scanner as a pseudo service monitor.  
I have used both
a calibrated FM signal generator and the local public service channels 
for reference.  The DC
coupling of the scope was adjusted to give a center line reference for 
frequency from the scanner's
discriminator and the vertical gain controls were adjusted for a 
convenient deviation scale.
Haven't measured it, but suspect the IF bandwidth on my scanner is 
fairly broad.

Using a calibrated service monitor to compare this scheme indicated no 
difference in readings.

Assuming we can get over that hurdle, the next one would be how to make 
an RF signal generator
 from the scanner.  Could we use the scanner's image through a broad 
band amplifier block into a
rudimentary attenuator?

73 de Jack  -  N7OO

Check Out the new free AIM(R) Mail -- 2 GB of storage and 
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[Repeater-Builder] Re: Poor Man's Service Monitors

[skipp025]

Neat to look at Nate, 

My first poor mans service/deviation monitor was a display tacked 
onto the a$$-end of a radio shack scanner.  Once I saw and recorded 
the relative deviation values from a known service monitor (on the 
most popular bands)... I could fudge a deviation pretty darn close. 

I then "upgraded" to one of the Heathkit Deviation Meters... After 
a time I again used the scanner deviation display as the easy to 
use quick check.  Don't laugh... it did work pretty well for what 
it is/was. 

cheers, 
skipp 

> "Nate Duehr" <[EMAIL PROTECTED]> wrote:
> Another interesting technique I learned about a couple of years 
> ago for setting FM deviation, if you don't have something to 
> measure it handy, is the Bessel-Null method.
> 
> This would seem to relate well to the "poor-man's service 
> monitor" topic.
> 
> Randy KC6HUR published some information on this for those 
> setting levels on IRLP systems and credits VK1OD with the 
> original information:
> 
> http://irlp.kc6hur.net/FmBcastSetup.php
> 
> Nate WY0X
>

Re: [Repeater-Builder] Sinclair Q202 tuning problem

[w5zit]

Eric, I had the identical issue with this duplexer. Eric Lemmon helped 
me solve the problem by commenting that the arrangement that Sinclair 
uses has a reject notch on both sides of the cavity resonance. A sweep 
of the cavity will show the two notches that can be moved in unison 
around the pass, with both notches moving the same direction as the 
stub is adjusted.

What you are missing is that the first piece of cable from each cavity 
to the Tee is part of the tuned circuit. My cavities were in the 170.xx 
range and the first cables were 10.5 inches. I increased the first 
cables from the cavity on the lower side from 10.5 to 12.5 inches and 
they tuned just fine in the ham band.

Eric scanned the manual for my duplexer and I can send you a copy if 
you are interested.

73 - Jim W5ZIT

-Original Message-
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Sat, 21 Apr 2007 10:31 PM
Subject: [Repeater-Builder] Sinclair Q202 tuning problem

I am having an issue tuning a Q202 duplexer. I reviewed the past 144
or so posts regarding Q202 issues, but haven't found any past posts
mentioning the following issue.

The unit was originally on 165MHz. It has the horizontal
copper/dielectric reject stubs which screw into the T-box on top of
the cavities.

The target frequencies are 146.800 tx, 146.200 rx. The high side
(tx)tunes just fine. I'm measuring about 1.5db insertion loss and
80db rejection on the tracking generator. The low side is the issue.

The pass (146.200) tunes just fine, with 1.5db or so of insertion
loss, but reject is an issue. The cavities on the low side act as if
they are another set of high-side cans. The reject rods appear to
tune properly, and I can get 80+db of rejection 600KHz low of
146.200, but no matter what I do, the reject will never go ABOVE the
pass frequency.

I doubt the cable harness lengths would cause this, no? From the past
posts I read, it sounds like if I were running out of room on the
reject rods, then the cable lenghts might be the issue. But my issue
is that the low side's reject is sitting below the pass, not above
the pass where it needs to be.

The duplexer swept ok before I started retuning it.

Any ideas? Would being an inch or so short on the L cables at the
new frequencies really cause the reject to be on the wrong side of
the pass, just on the low side only? The high-pass side tunes fine,
allthough the clear rods are only out of the copper tubes by about 1"
or so.

Thanks
Eric
KE2D

Check Out the new free AIM(R) Mail -- 2 GB of storage and 
industry-leading spam and email virus protection.

[Repeater-Builder] Service Monitors with D-Star

[skipp025]

> "Nate Duehr" <[EMAIL PROTECTED]> wrote:
> how are people testing/working on their D-Star systems?  
> I can't think of a single SM that knows how to do bit-error 
> rates and/or other AMBE vocoder functions.  

The fudge answer is...  most people just connect the equipment 
and press the go (power on) button. 

skipp 

Re: [Repeater-Builder] Micor Conversion

[N9LLO]

 
In a message dated 4/22/2007 9:08:05 AM Central Daylight Time, 
[EMAIL PROTECTED] writes:

there is a little more then that.  look at the back terminal board and the 
filters that need to be added to the receive connections.
 



The filters should already be there if it was a full duplex MED station.
 
Chris
N9LLO



** See what's free at http://www.aol.com.

Re: [Repeater-Builder] Service Monitors: IFR COM120B vs HP8920A

[Nate Duehr]

On 4/21/07, skipp025 <[EMAIL PROTECTED]> wrote:


The price of Service Monitors is all over the map right now. I
see prices and availability directly related to the state of
the LMR Industry, location and Ebay Action.



Definitely, Skipp.  I hunted for the "right" deal for my IFR-1500 for three
years... but I was assured by friends that the right one *would* eventually
come along... and the repeaters weren't going anywhere anyway... :-)

There always seems to be a "deal of the day" or two laying

around just out of sight.



My only advice for those hunting -- make it known you're looking, and ask
every ham you talk to politely if they know anyone selling a good quality
unit.  Know which units are out there and what features and options are on
each type.

I wasn't originally planning on buying the IFR... and I'd still love to have
an HP, but during a discussion with another repeater owner/operator he
mentioned that a friend of his in California had a good IFR 1500 he might be
interested in selling, and the rest... as they say, is history.

Depending on what type and how many features you might need for

a specific application... even an a really old service monitor
is handy as long as the previous owners haven't transmitted into
the wrong port.  It's a shame the pico fuse or similar animal
wasn't built in to all the factory installed coax ports.



Also agreed.  I ran across an older Motorola SM at a swapfest owned by a
gentleman I've known, and who was one of my Avionics instructors in college,
who takes immaculate care of his equipment, for $300.  While it didn't have
spectrum analysis, or a tracking generator, and it's power output is
somewhat all over the map (it helps to check older gear against a friend or
other's newer, calibrated, higher quality gear) -- it served fine for test
and tune-up of at least a few radios on the bench during the years I was
looking for the other SM.  Now it serves as an additional signal source and
"backup".

Sorry I can't answer Bruce's question about the differences between the 120B
and the 1500, as I never researched the 120.

One of the things I've been curious about since they started showing up --
how are people testing/working on their D-Star systems?  I can't think of a
single SM that knows how to do bit-error rates and/or other AMBE vocoder
functions.  A friend mentioned that a local D-Star system in his area
believes they have some desense, strictly by the performance of their system
-- but that's not good engineering practice.  They certainly can hook up an
analog transmitter/receiver and measure THAT way... but how do you
measure/test your real system properly?

It seems that Icom and others haven't addressed that (along with many other
problems inherent in D-Star's protocols, like no concept of a talk group
built into the protocol, and difficult Internet linking by various strange
"unit codes" that must be put in to effect those links).

Sorry - topic kinda changed there as I was thinking about it... feel free to
snip out whatever portions of the above into your replies...

Nate WY0X

Re: [Repeater-Builder] Service Monitors

[Nate Duehr]

Another interesting technique I learned about a couple of years ago for
setting FM deviation, if you don't have something to measure it handy, is
the Bessel-Null method.

This would seem to relate well to the "poor-man's service monitor" topic.

Randy KC6HUR published some information on this for those setting levels on
IRLP systems and credits VK1OD with the original information:

http://irlp.kc6hur.net/FmBcastSetup.php

Nate WY0X

Re: [Repeater-Builder] Repeater Dream List

[Nate Duehr]

On 4/22/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:


 Hi All!

Here is a tough problem.  A high ranking official in Law enforcement has
approach me to recommend equipment for a UHF repeater to be used by hams to
back up to local police/public safety.  He sounds like he has deep pockets,
the money sounds like it is coming from 9/11 inter-agency type funds. This
will be used in the ham bands.

Being a Micor junkie, and not really keeping up with newer technology
(newer than 1985!! hi hi!!)  what should I be looking at for him.

The antenna will be a DB420, Andrew heliax, and radio should be Motorola
... (we are in Chicago, Moto Country!)

With that in mind, we are looking in the 50 - 100 watt range.

Thanks, Brian, WD9HSY

ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT!



Money is NO object, and it must be Moto?

That's easy.  Quantar with dual analog and digital (APCO-25) capability, and
program it up to operate in dual-access mode.

Nate WY0X

Re: [Repeater-Builder] Sinclair Q202 tuning problem

[Burt Lang]

Keep in mind that there are two notches, one on each side of the pass. 
They are spaced about 10-15 MHz apart. When the low notch is at 146MHz, 
you will find the upper notch in the 154-156MHz area roughly. The reject 
coaxial capacitor (or the piston cap in the newer version) adjusts both 
notches in tandem.  To get a low pass can, you have to move the high 
notch down close to the pass band.  This takes more capacity in the 
reject capacitor.  You may even have to lengthen the center conductor in 
that capacitor to get it to tune low enough.

The proper length of cable harness may also help to lower the maximum 
capacity needed on the reject adjustment.

Good luck in your tuning

Burt  VE2BMQ>>>

kk2ed wrote:

snipped
> 
> The pass (146.200) tunes just fine, with 1.5db or so of insertion 
> loss, but reject is an issue. The cavities on the low side act as if 
> they are another set of high-side cans.  The reject rods appear to 
> tune properly, and I can get 80+db of rejection 600KHz low of 
> 146.200, but no matter what I do, the reject will never go ABOVE the 
> pass frequency. 
> 
> I doubt the cable harness lengths would cause this, no? From the past 
> posts I read, it sounds like if I were running out of room on the 
> reject rods, then the cable lenghts might be the issue. But my issue 
> is that the low side's reject is sitting below the pass, not above 
> the pass where it needs to be. 
> 

Re: [Repeater-Builder] Mini - UHF Connector

[Tedd Doda]

On Sat, 21 Apr 2007 22:51:04 -0700, Mike Morris WA6ILQ wrote:

>I've had no problems after I put a o-ring around the center pin and
>pushed it up inside the plug.

You beat me to it Mike! I've been using this "trick" 
for many years on excavating equipment or any other
vehicle that takes a beating.

Tedd Doda, VE3TJD
Lazer Audio and Electronics
Baden, Ontario, Canada

www.ve3tjd.com (personal)
www.eraradio.ca (Linked repeater system)

[Repeater-Builder] Re: Sinclair Q202 tuning problem

[kk2ed]

The split is in the same direction. Old pair was 165.7/164.6.   I 
made sure the low/hi relationship stayed the same. The old 165.7 is 
now 146.8, and the 164.6 side was moved to 146.2



--- In Repeater-Builder@yahoogroups.com, mch <[EMAIL PROTECTED]> wrote:
>
> Are you tuning the new high pass on the old high pass cans and not
> flipping them (tuning the new low pass RX on the old high pass RX 
side)?
> 
> Many people think that the TX has to stay the TX even if the 
repeater
> used to be HILO and is now LIHO. High pass should remain high pass 
and
> low pass should remain low pass.
> 
> What was the split on them before?
> 
> Joe M.
> 
> kk2ed wrote:
> > 
> > I am having an issue tuning a Q202 duplexer.  I reviewed the past 
144
> > or so posts regarding Q202 issues, but haven't found any past 
posts
> > mentioning the following issue.
> > 
> > The unit was originally on 165MHz. It has the horizontal
> > copper/dielectric reject stubs which screw into the T-box on top 
of
> > the cavities.
> > 
> > The target frequencies are 146.800 tx, 146.200 rx.   The high side
> > (tx)tunes just fine. I'm measuring about 1.5db insertion loss and
> > 80db rejection on the tracking generator. The low side is the 
issue.
> > 
> > The pass (146.200) tunes just fine, with 1.5db or so of insertion
> > loss, but reject is an issue. The cavities on the low side act as 
if
> > they are another set of high-side cans.  The reject rods appear to
> > tune properly, and I can get 80+db of rejection 600KHz low of
> > 146.200, but no matter what I do, the reject will never go ABOVE 
the
> > pass frequency.
> > 
> > I doubt the cable harness lengths would cause this, no? From the 
past
> > posts I read, it sounds like if I were running out of room on the
> > reject rods, then the cable lenghts might be the issue. But my 
issue
> > is that the low side's reject is sitting below the pass, not above
> > the pass where it needs to be.
> > 
> > The duplexer swept ok before I started retuning it.
> > 
> > Any ideas?   Would being an inch or so short on the L cables at 
the
> > new frequencies really cause the reject to be on the wrong side of
> > the pass, just on the low side only?  The high-pass side tunes 
fine,
> > allthough the clear rods are only out of the copper tubes by 
about 1"
> > or so.
> > 
> > Thanks
> > Eric
> > KE2D
> > 
> > 
> > 
> > Yahoo! Groups Links
> > 
> > 
> >
>

[Repeater-Builder] Re: Sinclair Q202 tuning problem

[kk2ed]

I usually use a 3db pad on the generator output and another on the 
ant input of the tracking generator. Another important item is a 50-
ohm load on the unmeasured side of the duplexer. I use a small 25w 
load from an old circulator.  


I'll try to use a few elbows to lenghten the harness and report back.

Eric



--- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ 
<[EMAIL PROTECTED]> wrote:
>
> At 10:31 PM 04/21/07, you wrote:
> >I am having an issue tuning a Q202 duplexer.  I reviewed the past 
144
> >or so posts regarding Q202 issues, but haven't found any past posts
> >mentioning the following issue.
> >
> >The unit was originally on 165MHz. It has the horizontal
> >copper/dielectric reject stubs which screw into the T-box on top of
> >the cavities.
> >
> >The target frequencies are 146.800 tx, 146.200 rx.   The high side
> >(tx)tunes just fine. I'm measuring about 1.5db insertion loss and
> >80db rejection on the tracking generator. The low side is the 
issue.
> >
> >The pass (146.200) tunes just fine, with 1.5db or so of insertion
> >loss, but reject is an issue. The cavities on the low side act as 
if
> >they are another set of high-side cans.  The reject rods appear to
> >tune properly, and I can get 80+db of rejection 600KHz low of
> >146.200, but no matter what I do, the reject will never go ABOVE 
the
> >pass frequency.
> >
> >I doubt the cable harness lengths would cause this, no? From the 
past
> >posts I read, it sounds like if I were running out of room on the
> >reject rods, then the cable lenghts might be the issue. But my 
issue
> >is that the low side's reject is sitting below the pass, not above
> >the pass where it needs to be.
> >
> >The duplexer swept ok before I started retuning it.
> >
> >Any ideas?   Would being an inch or so short on the L cables at the
> >new frequencies really cause the reject to be on the wrong side of
> >the pass, just on the low side only?  The high-pass side tunes 
fine,
> >allthough the clear rods are only out of the copper tubes by about 
1"
> >or so.
> >
> >Thanks
> >Eric
> >KE2D
> 
> Sinclair had two different harnesses for that beast, and the 
difference was
> about one and one-half inches.  As a quick test I'd add a coax 
elbow to each
> end of each intercavity cable in the harness and see just how much 
difference
> that makes. If I remember correctly each elbow adds about 0.8 to 
0.9 inch.
> 
> The tuning instructions for this unit are on the Antenna Systems 
page
> at repeater-builder. It includes the cable lengths.
> 
> Don't forget to put a 50 ohm pad on the generator and on the 
analyzer and
> then compensate for the pads in the measurements.
> 
> Mike WA6ILQ
>

RE: [Repeater-Builder] Micor Conversion

[Mike Perryman K5JMP]

Yup...  best advice is get the correct manual for the station and get to
know both very well  It will save you and your neighbors a lot of greif.

73
Mike
K5JMP
www.k5jmp.us


  -Original Message-
  From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Maire-Radios
  Sent: Sunday, April 22, 2007 10:05 AM
  To: Repeater-Builder@yahoogroups.com
  Subject: Re: [Repeater-Builder] Micor Conversion



  there is a little more then that.  look at the back terminal board and the
filters that need to be added to the receive connections.


- Original Message -
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, April 21, 2007 10:52 PM
Subject: [Repeater-Builder] Micor Conversion


I am converting a full duplex Micor base station to a repeater. The
station was pulled from service on the UHF MED channels and won't repeat
but will full duplex.

I have looked over repeater-builder.com and am not finding an article
describing the procedure. Can I just add the squelch gate and time out
timer cards and get it to repeat?

Randy




  

RE: [Repeater-Builder] Repeater Dream List

[N9WYS]

Brian,

 

Save yourself the work and the money... I have one already operating in your
back yard!!  Besides, coordinated 440 pairs are hard to come by in Illinois
anymore.

 

Machine details: 444.550  PL:114.8  

Located on the Will County tower on Owens Rd, between Laraway and Delaney
Roads.  

This machine is a cooperative effort between Will County EMA and Plainfield
Radio League.  

 

Contact me off-list if you desire more information:   n9wys  ameritech
 net

 

Mark - N9WYS

Repeater Trustee - WW9AE/R

Asst Chief - Operations, Will Co EMA 

 

  _  

From: Repeater-Builder@yahoogroups.com On Behalf Of [EMAIL PROTECTED]



Hi All!

 

Here is a tough problem.  A high ranking official in Law enforcement has
approach me to recommend equipment for a UHF repeater to be used by hams to
back up to local police/public safety.  He sounds like he has deep pockets,
the money sounds like it is coming from 9/11 inter-agency type funds. This
will be used in the ham bands.

 

Being a Micor junkie, and not really keeping up with newer technology (newer
than 1985!! hi hi!!)  what should I be looking at for him.

 

The antenna will be a DB420, Andrew heliax, and radio should be Motorola ...
(we are in Chicago, Moto Country!)

 

With that in mind, we are looking in the 50 - 100 watt range.

 

Thanks, Brian, WD9HSY

 

ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT! 

[Repeater-Builder] Re: Sinclair Q202 tuning problem

[kk2ed]

I tried to lenghthen the inside element of the reject capacitor rods 
using #10 copper from a piece of romex, but not much difference. The 
reject notch remained on the wrong side of the pass.  Is the copper not 
compatible with the existing materials the reject assembly is made of?




--- In Repeater-Builder@yahoogroups.com, DCFluX <[EMAIL PROTECTED]> wrote:
>
> Having the phase harness the wrong dimensions may cause this. You can
> either rebuild the harness or atempt to lengthen the center conductor
> inside the reject capacators.
>

Re: [Repeater-Builder] Repeater Dream List

[Jay Urish]

If money isn't an object, Motorola MTR2000.



[EMAIL PROTECTED] wrote:
> 
> 
> Hi All!
>  
> Here is a tough problem.  A high ranking official in Law enforcement has 
> approach me to recommend equipment for a UHF repeater to be used by hams 
> to back up to local police/public safety.  He sounds like he has deep 
> pockets, the money sounds like it is coming from 9/11 inter-agency type 
> funds. This will be used in the ham bands.
>  
> Being a Micor junkie, and not really keeping up with newer technology 
> (newer than 1985!! hi hi!!)  what should I be looking at for him.
>  
> The antenna will be a DB420, Andrew heliax, and radio should be Motorola 
> ... (we are in Chicago, Moto Country!)
>  
> With that in mind, we are looking in the 50 - 100 watt range.
>  
> Thanks, Brian, WD9HSY
>  
> ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT!
> 
> 
> 
> 
> See what's free at AOL.com .
> 

-- 
Jay Urish CCNANetwork Engineer
http://jay.unixwolf.net
Home)972.691.0125Cell)972.965.6229

[Repeater-Builder] Repeater Dream List

[bbedoe]

Hi All!
 
Here is a tough problem.  A high ranking official in Law enforcement  has 
approach me to recommend equipment for a UHF repeater to be used by hams to  
back 
up to local police/public safety.  He sounds like he has deep pockets,  the 
money sounds like it is coming from 9/11 inter-agency type funds. This will  be 
used in the ham bands.
 
Being a Micor junkie, and not really keeping up with newer  technology (newer 
than 1985!! hi hi!!)  what should I be looking at for  him.
 
The antenna will be a DB420, Andrew heliax, and radio should be Motorola  ... 
(we are in Chicago, Moto Country!)
 
With that in mind, we are looking in the 50 - 100 watt range.
 
Thanks, Brian, WD9HSY
 
ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT!



** See what's free at http://www.aol.com.

Re: [Repeater-Builder] Micor Conversion

[Maire-Radios]

there is a little more then that.  look at the back terminal board and the 
filters that need to be added to the receive connections.


  - Original Message - 
  From: [EMAIL PROTECTED] 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Saturday, April 21, 2007 10:52 PM
  Subject: [Repeater-Builder] Micor Conversion


  I am converting a full duplex Micor base station to a repeater. The 
  station was pulled from service on the UHF MED channels and won't repeat 
  but will full duplex.

  I have looked over repeater-builder.com and am not finding an article 
  describing the procedure. Can I just add the squelch gate and time out 
  timer cards and get it to repeat?

  Randy



   

Re: [Repeater-Builder] Repeater Dream List

[Com/Rad Inc]

Brian
Can you contact me off list

Ed Folta
Com/Rad Inc
Des Plaines IL

[EMAIL PROTECTED]

  - Original Message - 
  From: [EMAIL PROTECTED] 
  To: Repeater-Builder@yahoogroups.com ; [EMAIL PROTECTED] 
  Sent: Sunday, April 22, 2007 8:13 AM
  Subject: [Repeater-Builder] Repeater Dream List



  Hi All!

  Here is a tough problem.  A high ranking official in Law enforcement has 
approach me to recommend equipment for a UHF repeater to be used by hams to 
back up to local police/public safety.  He sounds like he has deep pockets, the 
money sounds like it is coming from 9/11 inter-agency type funds. This will be 
used in the ham bands.

  Being a Micor junkie, and not really keeping up with newer technology (newer 
than 1985!! hi hi!!)  what should I be looking at for him.

  The antenna will be a DB420, Andrew heliax, and radio should be Motorola ... 
(we are in Chicago, Moto Country!)

  With that in mind, we are looking in the 50 - 100 watt range.

  Thanks, Brian, WD9HSY

  ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT!





--
  See what's free at AOL.com. 

   

Re: [Repeater-Builder] Repeater Dream List

[Milt]

Brian,

First choice, Quantar or MTR2000.  Get the preselector and the software + pgm. 
cable
EIther one will do VERY nicely.  
Fall back position, Radius M1225 again get the optional preselector and the 
software + pgm. cable

Milt N3LTQ

  - Original Message - 
  From: [EMAIL PROTECTED] 
  To: Repeater-Builder@yahoogroups.com ; [EMAIL PROTECTED] 
  Sent: Sunday, April 22, 2007 9:13 AM
  Subject: [Repeater-Builder] Repeater Dream List


  Hi All!

  Here is a tough problem.  A high ranking official in Law enforcement has 
approach me to recommend equipment for a UHF repeater to be used by hams to 
back up to local police/public safety.  He sounds like he has deep pockets, the 
money sounds like it is coming from 9/11 inter-agency type funds. This will be 
used in the ham bands.

  Being a Micor junkie, and not really keeping up with newer technology (newer 
than 1985!! hi hi!!)  what should I be looking at for him.

  The antenna will be a DB420, Andrew heliax, and radio should be Motorola ... 
(we are in Chicago, Moto Country!)

  With that in mind, we are looking in the 50 - 100 watt range.

  Thanks, Brian, WD9HSY

  ITS A TOUGH JOB, BUT SOMEONE HAS TO DO IT!





--
  See what's free at AOL.com. 
   

RE: [Repeater-Builder] Re: TKR-750 P/A Failures

[Mike Mullarkey]

Go to an authorized Kenwood dealer and most likely Kenwood will ask for the
sale date and warranty it & if not contact me off the list and ill see what
I can do.

 

Oregon Repeater Linking Group

Mike Mullarkey

6539 E Street

Springfield, OR 97478

[EMAIL PROTECTED]

www.orlg.org

 

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Steve
Sent: Sunday, April 22, 2007 2:28 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: TKR-750 P/A Failures

 

--- In Repeater-Builder@ 
yahoogroups.com, "Gareth Bennett"
<[EMAIL PROTECTED]> wrote:
>
> Hi Group,
> Can anybody out there enlighten me on the power amp failures on
the earlier Kenwood TKR-750 Repeaters? I recall that Kenwood was
scrambling around changing these under warranty when the 750 was first
released.
> I have just removed one from service that was only pushing 15 Watts
@ 7 Amps (Set for High power). 
> This particular repeater has already suffered dry joints around
the PA stage which was not the cause of fault this time. 
> Can any Kenwood dealers shed some light on this common problem and
suggest the replacement P/A part number for around 150-160 MHz?

There is always confusion with the TKR-750. The K1 range is 146 - 162
MHz and K2 is 136-150 MHz. There was a revision to the K2. This is
my take on it all..

The K1 and K2 range (version 1 not v2) repeater takes the kpg-66d
software. The late-model K2 range, version 2 repeater takes KPG-91D
software. If you have the K2, version 2 it is backwards compatible
with the KPG-66D software. It does not work the other way. Version 1
will only work with KPG-66D.

How to identify what you have. Version 2 units have "Ver. 2.0" on the
side and say "Kenwood TKR-750" on the front. The version 1, will only
say "Kenwood" on the front, and the -2 on the side only signifies that
it's a K2 range. 

Nearest I can tell, around Nov 2003 Kenwood alerted many owners of a
K2, version 1 recall. Kenwood fixed the version 1's by replacing with
larger driver transistor and final, at no cost. 

The MOSFET driver on the new board was about four times larger than
the original. The output transistor is also larger. The old driver
is common in ICOM VHF/UHF transceivers. The origional is a "pill"
type driver transistor, similar in appearance to an MRF901 (fairly
small). You can tell if you have the new version as the driver will
be roughly the same size as the final PA. 

Shortly there after, Version 2 came out, (April-May of 2005 was the
Version 1/Version 2 transition time) which included this larger driver
transistor and final, and apparently changed the firmware too which
explains why you'd need the KPG-91d software if you have a version 2.
In the K2, version 2 with the KPG-91d software you can define what
high and low power is in software under the "PC Tuning Mode", with the
KPG-91D software, along with other options unsupported in the first
version. The guts between the two versions of the K2 are quite
different. There were a few DSP problem that was more apparent with
the fleetwatch functions, which was apparently part of the reason for
the redesign to Version 2.

Hope this helps.

 

[Repeater-Builder] Re: TKR-750 P/A Failures

[Steve]

--- In Repeater-Builder@yahoogroups.com, "Gareth Bennett"
<[EMAIL PROTECTED]> wrote:
>
> Hi Group,
> Can anybody out there enlighten me on the power amp failures on
the earlier Kenwood TKR-750 Repeaters? I recall that Kenwood was
scrambling around changing these under warranty when the 750 was first
released.
> I have just removed one from service that was only pushing 15 Watts
@ 7 Amps (Set for High power). 
> This particular repeater has already suffered dry joints around
the PA stage which was not the cause of fault this time. 
> Can any Kenwood dealers shed some light on this common problem and
suggest the replacement P/A part number for around 150-160 MHz?


There is always confusion with the TKR-750.  The K1 range is 146 - 162
MHz  and K2 is 136-150 MHz.  There was a revision to the K2.  This is
my take on it all..

The K1 and K2 range (version 1 not v2)  repeater takes the kpg-66d
software. The late-model K2 range, version 2 repeater takes KPG-91D
software.   If you have the K2, version 2 it is backwards compatible
with the KPG-66D software.  It does not work the other way. Version 1
will only work with  KPG-66D.

How to identify what you have.  Version 2 units have "Ver. 2.0" on the
side and say "Kenwood TKR-750" on the front.  The version 1, will only
say "Kenwood" on the front, and the -2 on the side only signifies that
it's a K2 range.  

Nearest I can tell, around Nov 2003 Kenwood alerted many owners of a
K2, version 1 recall.  Kenwood fixed the version 1's by replacing with
larger driver transistor and final, at no cost.  

The MOSFET driver on the new board was about four times larger than
the original.  The output transistor is also larger.  The old driver
is common in ICOM VHF/UHF transceivers.   The origional is a "pill"
type driver transistor, similar in appearance to an MRF901 (fairly
small).  You can tell if you have the new version as the driver will
be roughly the same size as the final PA. 

Shortly there after, Version 2 came out, (April-May of 2005 was the
Version 1/Version 2 transition time) which included this larger driver
transistor and final, and apparently changed the firmware too which
explains why you'd need the KPG-91d software if you have a version 2.
 In the K2, version 2 with the KPG-91d  software you can define what
high and low power is in software under the "PC Tuning Mode", with the
KPG-91D software, along with other options unsupported in the first
version.  The guts between the two versions of the K2 are quite
different.  There were a few DSP problem that was more apparent with
the fleetwatch functions, which was apparently part of the reason for
the redesign to Version 2.

Hope this helps.

Re: [Repeater-Builder] Mini - UHF Connector

[Barry C']

>From: Dexter McIntyre W4DEX <[EMAIL PROTECTED]>
>Reply-To: Repeater-Builder@yahoogroups.com
>To: [EMAIL PROTECTED],  Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] Mini - UHF Connector
>Date: Sun, 22 Apr 2007 02:51:52 -0400
>
>Mike Morris WA6ILQ wrote:
>
> > I've had no problems after I put a o-ring around the center pin and
> > pushed it up inside the plug.
>
>Great idea Mike!  I can see how the o-ring will keep a little pressure on 
>the
>connector threads to keep it from vibrating loose.
>
>Thanks,
>Dex
Also if you have to use the uhf connector then winding a strip of rubber 
cable sealant over the coax and plug assures a tight water tight 
mechanically secure  joint , your local electrical supply house should stock 
it , I prefer Nitto tape .

_
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Re: [Repeater-Builder] Sinclair Q202 tuning problem

[Mike Morris WA6ILQ]

At 10:31 PM 04/21/07, you wrote:
>I am having an issue tuning a Q202 duplexer.  I reviewed the past 144
>or so posts regarding Q202 issues, but haven't found any past posts
>mentioning the following issue.
>
>The unit was originally on 165MHz. It has the horizontal
>copper/dielectric reject stubs which screw into the T-box on top of
>the cavities.
>
>The target frequencies are 146.800 tx, 146.200 rx.   The high side
>(tx)tunes just fine. I'm measuring about 1.5db insertion loss and
>80db rejection on the tracking generator. The low side is the issue.
>
>The pass (146.200) tunes just fine, with 1.5db or so of insertion
>loss, but reject is an issue. The cavities on the low side act as if
>they are another set of high-side cans.  The reject rods appear to
>tune properly, and I can get 80+db of rejection 600KHz low of
>146.200, but no matter what I do, the reject will never go ABOVE the
>pass frequency.
>
>I doubt the cable harness lengths would cause this, no? From the past
>posts I read, it sounds like if I were running out of room on the
>reject rods, then the cable lenghts might be the issue. But my issue
>is that the low side's reject is sitting below the pass, not above
>the pass where it needs to be.
>
>The duplexer swept ok before I started retuning it.
>
>Any ideas?   Would being an inch or so short on the L cables at the
>new frequencies really cause the reject to be on the wrong side of
>the pass, just on the low side only?  The high-pass side tunes fine,
>allthough the clear rods are only out of the copper tubes by about 1"
>or so.
>
>Thanks
>Eric
>KE2D

Sinclair had two different harnesses for that beast, and the difference was
about one and one-half inches.  As a quick test I'd add a coax elbow to each
end of each intercavity cable in the harness and see just how much difference
that makes. If I remember correctly each elbow adds about 0.8 to 0.9 inch.

The tuning instructions for this unit are on the Antenna Systems page
at repeater-builder. It includes the cable lengths.

Don't forget to put a 50 ohm pad on the generator and on the analyzer and
then compensate for the pads in the measurements.

Mike WA6ILQ

Re: [Repeater-Builder] Micor Conversion

[Mike Morris WA6ILQ]

At 07:52 PM 04/21/07, you wrote:
>I am converting a full duplex Micor base station to a repeater.  The
>station was pulled from service on the UHF MED channels and won't repeat
>but will full duplex.
>
>I have looked over repeater-builder.com and am not finding an article
>describing the procedure.  Can I just add the squelch gate and time out
>timer cards and get it to repeat?
>
>Randy

Using just the squelch gate and time out timer cards will get it to repeat
but it won't be legal in amateur service as you will not have any 
remote control
(i.e. remote shutdown and setup), or an identifier.

The common micor station conversion is in three steps, all of which
are documented on repeater-builder:

1) move the RF section to the new frequencies.
2) do the Jeff DePolo mod to the tripler. They are impossible to find these
days, so stretching the life of the one you have is A Good Thing.
3) Interface it to your repeater controller. Some conversions keep the
Squelch Gate card, some don't.  Some folks trust the timeout timer
in the repeater controller, some modify the Moto Timeout Timer card
to an hour or so and use it as a backup.

Mike WA6ILQ