[Repeater-Builder] Db222 Antanna

[bzlljr]

Thanks to everone that replied to my question concerning the DB222 
antenna. Very good suggestions, which I will apply.

Wesley AB8KD 








 
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RE: [Repeater-Builder] Fiberglass antenna protective coating?

[Jeff DePolo]

> I have a Phelps-Dodge VHF antenna about 21'10" long.
> 
> Tell me about the three radials at the bottom.
> For the 2 meter band, what should the length be?
> 
> The NCG GP-6 antennas use about 19.5" long radials.
> 
> Should the radials be straight, like the GP-6, or angled down 
> some degree(s)?
> 
> What should the length of the radials be, for a UHF band antenna?

It depends on which model antenna you have.  From what I've seen, having
disassembled many, those that are comprised of coaxial half-wave elements
(VHF PD220, UHF PD1151, PD455, etc.) use radials sloping down at a 45 degree
angle for decoupling only.  The length of radials is nominally 1/4 wave, but
they are slightly shorter than that physically due to their width.  For
antennas that are non-coaxial elements, the radials are at a 90 degree angle
and serve more as a ground plane.  PD200 on VHF, PD400 on UHF have 90 degree
radials.  For these antennas, the radials are arguably more critical than
the models where they are used for decoupling only.

If your VHF antenna is in the 21' range, it could be either a PD220 or
PD200.  Does it still have a sticker on it?

--- Jeff

Jeff DePolo WN3A - [EMAIL PROTECTED]
Broadcast and Communications Consultant 


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[Repeater-Builder] Info wanted on Mitrek VHF rptr.

[n3dab]

73's  to the Group

The following info appears on a MITREK VHF Mobile repeater.  This is 
a factory (Motorola) built product, NOT an after market modified 
mobile radio.   Can anyone provide any information or documentation 
on this repeater ?  Local searches thru Motorola shops have produced 
nothing.

On the ID plate:   Prim. Pwr. 12v   Motorola Canada Ltd.
Doc. No.   109191038X
 MITREK Type JJA   Watt 2-10
Mod. No.   MX23JJA1106BAZ 
Ser. No.   533PKN1018
Motorola Inc. Made in USA

On chasis behind handle:HUD1052CPR
On the PC bd. near Rcvr.elements:   HLD4082BPR
On frame near Tx elements:  HLD1002BPR
On Controller/PL bd.:   TKN9539BAZ
On PA bd.:  HLD4124APR   and   TLD5591BAZ

Label on top cover reads: " Mobile Communications" and has a "AGT" 
logo.  Probably installed by the service shop.

The Rcvr is fed thru the SO239 on the front of the Chasis, the Xmtr 
is fed out a SO239 on the left rear of the heat sink casting and the 
recess for it was part of the casting process.

This repeater appears to function with the standard control head and 
cable, though I don't have the original but have had it bench tested 
for operation.

TIA for any and all help

Doug   N3DAB 









 
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[Repeater-Builder] GM300 programing question

[bbedoe]

Hi All!  OK, its silly question time!
 
Background:
 
I use a number of UHF Maxtracs for GR300 type operations, links what have 
you.  I have had no problems programming the little buggers with a pentium 
1 233 computer (maybe its a little fast of a computer)
 
I recent pick up a few UHF GM300's.  The 1st radio I was able to 
read, change, program all 8 modes with no problems.  I did some on air 
QSO's.  All was well except I programmed a friends repeater wrong. went 
back in changed the FREQ, saved it back to the radio, it beeped at me like 
normal but now it is now DOA no TX/RX.  The radio powers up, I 
can go thought all 8 modes (it originally had only 2) but no TX or RX.
 
I rebooted the computer, reread the radio (all 8 new modes were there) 
programmed it again, beeped like normal. still dead!  
GRR! 
 
Yes, I'm aware that Maxtrac and GM300 software is different.  I'm 
aware of the speed issues, hence the concern that the pent 1 233mhz being a 
little fast, but I've had no problems with the Maxtracs.  The radios are 
beeping like normal at the end of the reads/programing, and I'm not getting any 
error codes.
 
Any ideas?
Brian













  




  
  
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RE: [Repeater-Builder] GM300 programing question

[Eric Lemmon]

Brian,
 
Try testing the radio 
with a hand mike plugged into the front, with the accessory connector 
unplugged.  Sometimes, the accessory connector pin assignments get restored 
to a default pattern during an incomplete write cycle, thereby making the radio 
unresponsive to inputs or controls from a RICK.
 
If you are using a clone 
RIB, it's possible that the TTL voltages going to the radio are at the ragged 
edge of being out of tolerance.  If using a genuine Motorola RIB, try using 
a separate 12 VDC power supply for it, rather than the internal 
battery.

73, Eric Lemmon WB6FLY 



From: Repeater-Builder@yahoogroups.com 
[mailto:[EMAIL PROTECTED] On Behalf Of 
[EMAIL PROTECTED]Sent: Saturday, March 25, 2006 9:05 
AMTo: Repeater-Builder@yahoogroups.com; 
[EMAIL PROTECTED]Subject: [Repeater-Builder] GM300 
programing question

Hi All!  OK, its silly question time!
 
Background:
 
I use a number of UHF Maxtracs for GR300 type operations, links what have 
you.  I have had no problems programming the little buggers with a pentium 
1 233 computer (maybe its a little fast of a computer)
 
I recent pick up a few UHF GM300's.  The 1st radio I was able to 
read, change, program all 8 modes with no problems.  I did some on air 
QSO's.  All was well except I programmed a friends repeater wrong. went 
back in changed the FREQ, saved it back to the radio, it beeped at me like 
normal but now it is now DOA no TX/RX.  The radio powers up, I 
can go thought all 8 modes (it originally had only 2) but no TX or RX.
 
I rebooted the computer, reread the radio (all 8 new modes were there) 
programmed it again, beeped like normal. still dead!  
GRR! 
 
Yes, I'm aware that Maxtrac and GM300 software is different.  I'm 
aware of the speed issues, hence the concern that the pent 1 233mhz being a 
little fast, but I've had no problems with the Maxtracs.  The radios are 
beeping like normal at the end of the reads/programing, and I'm not getting any 
error codes.
 
Any ideas?
Brian













  




  
  
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Re: [Repeater-Builder] GM300 programing question

[bbedoe]

In a message dated 3/25/2006 11:20:40 AM Central Standard Time, 
[EMAIL PROTECTED] writes:
Try testing the radio with a hand mike plugged into 
  the front, with the accessory connector 
unplugged

Radio is in standalone w the regular 16 pin connector on the back.
 
If you are using a clone RIB, it's possible 
that the TTL voltages going to the radio are at the ragged edge of being out of 
tolerance.  If using a genuine Motorola RIB, try using a separate 12 VDC 
power supply for it, rather than the internal battery.
 
Its a generic, with a new battery. I'll 
try a fresh battery!
 
 
Keep those letters and cards a 
coming!   (no flames!)
 
Brian













  




  
  
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Re: [Repeater-Builder] GM300 programing question

[Jay Urish]

I dont think that the speed of your pc hosed that radio. It might just 
be a coicendence.


I would wipe all the modes from the radio and make mode 1 a simplex freq 
in the middle of the radios bandsplit and test from there..


[EMAIL PROTECTED] wrote:
> Hi All!  OK, its silly question time!
>  
> Background:
>  
> I use a number of UHF Maxtracs for GR300 type operations, links what 
> have you.  I have had no problems programming the little buggers with a 
> pentium 1 233 computer (maybe its a little fast of a computer)
>  
> I recent pick up a few UHF GM300's.  The 1st radio I was able to read, 


--
Jay Urish W5GM
ARRL Life MemberDenton County ARRL VEC
TXFCA President N5ERS VP/Trustee
DCARA President Denton County ARES AEC

Monitoring 444.850 PL-88.5 146.92 PL-110.9




 
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RE: [Repeater-Builder] Info wanted on Mitrek VHF rptr.

[Eric Lemmon]

Doug,

Although I have never seen one, I do know that Motorola made some
full-duplex Mitrek radios- but a Mitrek repeater is a new one on me.  Is
this unit actually a repeater, that is, does it retransmit any signal it
receives?  Or is it simply able to receive on one frequency while
transmitting on another?  If the latter, it is not a repeater per se, but
simply a full-duplex radio used in a public-safety application with a
handset.

One method I often use to track down a service manual for oddball equipment
like this, is to look at the channel elements to learn what frequencies were
used.  I then contact the seller to learn the history of the radio, and
perhaps where in the country it was used.  A search of the FCC Land Mobile
Radio database sometimes reveals what licensee(s) used those frequencies in
that area.  Finally, if I'm lucky so far, I can sometimes contact the radio
shop for that entity and talk them out of the service manual that might
still be on a shelf or filed away.  I always offer to send a check up front,
for more than the cost of postage, to make it worthwhile to unload a manual
that is no longer needed.  Even if the shop won't part with the manual, just
knowing the complete part number of the document is important information.

Above all, I never ask anyone to "just make a copy" of a manual, because
that might tie someone up at a copier or scanner for an hour or more, and
the pages that result are often difficult to make any sense of unless they
are taped together.  Maybe if it only is a few pages, but anything over that
goes to a graphics shop for scanning or copying.  Although the result is a
complete and high-quality reproduction, the total cost (including two round
trips to the graphics shop) might be three or four times the cost of an
original manual- which sometimes is still available!  But, I digress...

I looked up the your model number in my cross-reference manual, without
finding a listing.  Perhaps one of the list's Mitrek specialists can provide
some insight into this unusual radio...?

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of n3dab
Sent: Saturday, March 25, 2006 8:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Info wanted on Mitrek VHF rptr.

73's  to the Group

The following info appears on a MITREK VHF Mobile repeater.  This is 
a factory (Motorola) built product, NOT an after market modified 
mobile radio.   Can anyone provide any information or documentation 
on this repeater ?  Local searches thru Motorola shops have produced 
nothing.

On the ID plate:   Prim. Pwr. 12v   Motorola Canada Ltd.
Doc. No.   109191038X
 MITREK Type JJA   Watt 2-10
Mod. No.   MX23JJA1106BAZ 
Ser. No.   533PKN1018
Motorola Inc. Made in USA

On chasis behind handle:HUD1052CPR
On the PC bd. near Rcvr.elements:   HLD4082BPR
On frame near Tx elements:  HLD1002BPR
On Controller/PL bd.:   TKN9539BAZ
On PA bd.:  HLD4124APR   and   TLD5591BAZ

Label on top cover reads: " Mobile Communications" and has a "AGT" 
logo.  Probably installed by the service shop.

The Rcvr is fed thru the SO239 on the front of the Chasis, the Xmtr 
is fed out a SO239 on the left rear of the heat sink casting and the 
recess for it was part of the casting process.

This repeater appears to function with the standard control head and 
cable, though I don't have the original but have had it bench tested 
for operation.

TIA for any and all help

Doug   N3DAB 









 
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RE: [Repeater-Builder] GM300 programing question

[N9WYS]

Have you tried using MoSlo to slow down
the clock speed of the processor?  This is a trick I learned from the local
MSS rep here in Chicago.

 

Mark – N9WYS

 









From: Repeater-Builder@yahoogroups.com 
Sent: Saturday, March 25, 2006
11:05 AM
To: Repeater-Builder@yahoogroups.com;
[EMAIL PROTECTED]
Subject: [Repeater-Builder] GM300
programing question



 



I use a number of UHF Maxtracs for GR300
type operations, links what have you.  I have had no problems programming
the little buggers with a pentium 1 233 computer (maybe its a little fast of a
computer)

 

-  snip  -



















  




  
  
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Re: [Repeater-Builder] Simple ID unit

[Dexter McIntyre W4DEX]

Someone suggested an ID board listed on eBay.  I was looking for a cheap 
versatile ID board for a microwave beacon so I bought the kit.  It 
arrived promptly and I assembled it this morning.  It took maybe one 
half hour to install the components on the board and have it connected 
to the computer for programming.

I'm very pleased with the quality of the circuit board, the kit's 
documentation and it's total shipped price of $23.25.

An eBay search for   ID-O-Matic Repeater IDbrings up this item.

Thanks to whoever it was that led me to buy this ID board.

Dexter,
W4DEX




 
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Re: [Repeater-Builder] Info wanted on Mitrek VHF rptr.

[N8BQN]

>From his description, I'd almost expect to find "WHAC" engraved on the case ..
LOL!!

trying "AGT canada" in Google got 629,000 hits...  ummm ~ no thanks.
Sounds like a challenge !
Good Luck.


Eric Lemmon wrote:
I looked up the your model number in my cross-reference manual, without finding
a listing.  Perhaps one of the list's Mitrek specialists can provide some
insight into this unusual radio...?

>
> On the ID plate:   Prim. Pwr. 12v   Motorola Canada Ltd.
> Doc. No.   109191038X
>  MITREK Type JJA   Watt 2-10
> Mod. No.   MX23JJA1106BAZ
> Ser. No.   533PKN1018
> Motorola Inc. Made in USA
>
> Label on top cover reads: " Mobile Communications" and has a "AGT" logo.
> Probably installed by the service shop.
> Doug   N3DAB





 
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[Repeater-Builder] Re: GM300 programing question

[Gary]

It could be a multitude of problems, as a few have already stated. 
However, if it is RSS that is DOS based, you are playing roulette 
with your radios if you are using a computer faster than a 486/25.
Slower is better, yet. I happen to use a 486/25 laptop. There is 
usually an abundance of 486/xx laptops on Ebay that you can pick up 
for a song! Makes a great portable programming platform. I would 
stay away from moslow, and/or any kind of DOS emulator, etc. IMHO. 
Slow computer with DOS ver. 6.22.

Gary

--- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote:
>
> Hi All!  OK, its silly question time!
>  
> Background:
>  
> I use a number of UHF Maxtracs for GR300 type operations, links 
what have  
> you.  I have had no problems programming the little buggers with a 
pentium  1 
> 233 computer (maybe its a little fast of a computer)
>  
> I recent pick up a few UHF GM300's.  The 1st radio I was able to  
read, 
> change, program all 8 modes with no problems.  I did some on air  
QSO's.  All was 
> well except I programmed a friends repeater wrong. went  back 
in changed 
> the FREQ, saved it back to the radio, it beeped at me like  normal 
but now it is 
> now DOA no TX/RX.  The radio powers up, I  can go thought all 8 
modes (it 
> originally had only 2) but no TX or RX.
>  
> I rebooted the computer, reread the radio (all 8 new modes were 
there)  
> programmed it again, beeped like normal. still dead!   
GRR! 
>  
> Yes, I'm aware that Maxtrac and GM300 software is different.  I'm  
aware of 
> the speed issues, hence the concern that the pent 1 233mhz being 
a  little 
> fast, but I've had no problems with the Maxtracs.  The radios are  
beeping like 
> normal at the end of the reads/programing, and I'm not getting 
any  error codes.
>  
> Any ideas?
> Brian
>








 
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[Repeater-Builder] mystery board...

[Mike Perryman K5JMP]

Hi folks,
I have a mystery board for which I can find no reference.  It is aTLB4390B2,
about 2.5 inches square.  
For the Moto Guru's the 84 number is 84C84  87IKDI  DAB
Anybody got a clue?

73
Mike
K5JMP
www.k5jmp.us





 
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<>

Re: [Repeater-Builder] mystery board...

[N8BQN]

The "B" sez it's lo-band ...
what kind of box did it come from?  (err.. cardboard ?)  ;-)



Mike Perryman K5JMP wrote:

> I have a mystery board for which I can find no reference.  It is aTLB4390B2,
> about 2.5 inches square.
> For the Moto Guru's the 84 number is 84C84  87IKDI  DAB
> Anybody got a clue?





 
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RE: [Repeater-Builder] mystery board...

[Mike Perryman K5JMP]

Yup,
Been floating around so long that I can't seem to remember where it came
from...
I am a confirmed low-band nut... this link holds the proof!

73
Mike
K5JMP
www.k5jmp.us
"There's no band, like low band"

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of
[EMAIL PROTECTED]
Sent: Saturday, March 25, 2006 7:07 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] mystery board...



The "B" sez it's lo-band ...
what kind of box did it come from?  (err.. cardboard ?)  ;-)



Mike Perryman K5JMP wrote:

> I have a mystery board for which I can find no reference.  It is
aTLB4390B2,
> about 2.5 inches square.
> For the Moto Guru's the 84 number is 84C84  87IKDI  DAB
> Anybody got a clue?






Yahoo! Groups Links












 
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RE: [Repeater-Builder] mystery board...

[n . mckie]

  A low-band something ... TLB tells you that. 

  What did you get it out of? 

  Neil - WA6KLA 


 Original Message 
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] mystery board...
Date: Sat, 25 Mar 2006 18:23:29 -0500

>Hi folks,
>I have a mystery board for which I can find no reference.  It is
>aTLB4390B2,
>about 2.5 inches square.  
>For the Moto Guru's the 84 number is 84C84  87IKDI  DAB
>Anybody got a clue?
>
>73
>Mike
>K5JMP
>www.k5jmp.us
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 






 
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RE: [Repeater-Builder] mystery board...

[Mike Perryman K5JMP]

A cardboard box that I haven't opened in about 5 yrs  !

mike

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of
[EMAIL PROTECTED]
Sent: Saturday, March 25, 2006 7:12 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] mystery board...



  A low-band something ... TLB tells you that. 

  What did you get it out of? 

  Neil - WA6KLA 


 Original Message 
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] mystery board...
Date: Sat, 25 Mar 2006 18:23:29 -0500

>Hi folks,
>I have a mystery board for which I can find no reference.  It is
>aTLB4390B2,
>about 2.5 inches square.  
>For the Moto Guru's the 84 number is 84C84  87IKDI  DAB
>Anybody got a clue?
>
>73
>Mike
>K5JMP
>www.k5jmp.us
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 






 
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[Repeater-Builder] NEW - ICS Basic repeater controller partial Kits

[brian_martens_ics]

Hi All

FYI

I am happy to announce that the Basic repeater controller is now
avaiable in a partial kit form.  It will include the Basic PCB, a
programmed microcontroller, a DTMF decoding chip, a 0 ohm resistor and
a copy of the manual on CD.  The Basic manual now includes a detailed
parts list (see the website) to help with assembly.  The new Basic
repeater controller kit sells for $24.95.

Thanks and 73
Brian
ka9pmm
ICS
www.ics-ctrl.com







 
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[Repeater-Builder] 5-Pin Accessory Connectors for MaxTrac and Radius Mobiles

[Eric Lemmon]

One source for the 5-pin accessory connectors used on some MaxTrac and
Radius mobile radios is the Molex/Waldom ".156 KK Housings & Terminals 5
circuit" kits sold in a blister pack as part number WMLX-204.  The package
contains three #09-50-3051 female housings and 16 #08-50-0106 crimp-on
terminals.

There are three little tangs that must be cut off before the plug will fit,
but this can be done in seconds with a sharp nipper or X-acto knife.

The housing is available without the locking tangs as #09-50-7051:
http://www.molex.com/product/pcb/2139.html
The cut sheet for the terminals is found here:
http://www.molex.com/product/pcb/2478.html
I found both parts available at Mouser Electronics:
http://www.mouser.com/catalog/625/1068.pdf

73, Eric Lemmon WB6FLY







 
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[Repeater-Builder] Re: Info wanted on Mitrek VHF rptr.

[skipp025]

Motorola used the Mitrek Casting for many other projects 
like the mentioned and Loran C receivers. They were quite 
up to special projects using a quiver of tried and true 
equipment models. 

The color of the PC Board (red vs green), the style and 
circuit design can tell you a lot about it. Many of the 
special projects were made in Texas. 

If I saw a picture of it, I could probably tell you more 
about it.  If it was a special production, the agency 
or company for which it was made would now/might be the 
only source for the manual, which was supplied as an 
"as built" with the equipment. 

If you don't know who it was made for... a search of the 
frequencies off the channel elements might give you a clue. 

cheers, 
skipp 
skipp025 at yahoo.com 

> "n3dab" <[EMAIL PROTECTED]> wrote:
>
> 73's  to the Group
> 
> The following info appears on a MITREK VHF Mobile repeater.  This is 
> a factory (Motorola) built product, NOT an after market modified 
> mobile radio.   Can anyone provide any information or documentation 
> on this repeater ?  Local searches thru Motorola shops have produced 
> nothing.
> 
> On the ID plate:   Prim. Pwr. 12v   Motorola Canada Ltd.
> Doc. No.   109191038X
>  MITREK Type JJA   Watt 2-10
> Mod. No.   MX23JJA1106BAZ 
> Ser. No.   533PKN1018
> Motorola Inc. Made in USA
> 
> On chasis behind handle:HUD1052CPR
> On the PC bd. near Rcvr.elements:   HLD4082BPR
> On frame near Tx elements:  HLD1002BPR
> On Controller/PL bd.:   TKN9539BAZ
> On PA bd.:  HLD4124APR   and   TLD5591BAZ
> 
> Label on top cover reads: " Mobile Communications" and has a "AGT" 
> logo.  Probably installed by the service shop.
> 
> The Rcvr is fed thru the SO239 on the front of the Chasis, the Xmtr 
> is fed out a SO239 on the left rear of the heat sink casting and the 
> recess for it was part of the casting process.
> 
> This repeater appears to function with the standard control head and 
> cable, though I don't have the original but have had it bench tested 
> for operation.
> 
> TIA for any and all help
> 
> Doug   N3DAB
>







 
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[Repeater-Builder] OT: Dayton Fleamarket space prices?

[Paul Finch]

Hello,

I know this is off-topic but I don't know where to ask this question.  I
have sent a email to the Hamfest folks by the way, who knows if they will
respond.

Has anyone looked at the space price listed on their website?  It is a
graduated price scheme, the more spaces you buy the more it costs you!  The
price for 3 spaces is almost twice what 2 spaces costs!

Why do they do that?  They seem to me to be the highest priced Hamfest,
anyway this price scheme is just strange!  Who is getting rich there?
Somebody must be!

Paul







 
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Re: [Repeater-Builder] OT: Dayton Fleamarket space prices?

[mch]

As I've told a number of people - it looks like they are trying to run it
into the ground. It's not dying fast enough for someone...

When you have THREE CARS in an entire section (the west one - farthest
from the arena) on Sunday, that says something.

I understand getting a reply from the committee is like pulling teeth this
year. In past years, confirmations were received the year before. I know
people who are STILL waiting on space confirmations and we're within two
months.

Joe M.

> Hello,
>
> I know this is off-topic but I don't know where to ask this question.  I
> have sent a email to the Hamfest folks by the way, who knows if they will
> respond.
>
> Has anyone looked at the space price listed on their website?  It is a
> graduated price scheme, the more spaces you buy the more it costs you!
> The
> price for 3 spaces is almost twice what 2 spaces costs!
>
> Why do they do that?  They seem to me to be the highest priced Hamfest,
> anyway this price scheme is just strange!  Who is getting rich there?
> Somebody must be!
>
> Paul
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>





 
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RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?

[Paul Finch]

Joe,

Wow, this is weird, I got your reply BEFORE I got the message back from me!
Wonder what's up with that!  I heard something about the owners of the arena
want to discontinue the Hamvention and sell the property or something like
that.  That was two years ago the last time I was at Dayton.

One other thing, our local club here in Azle, Texas is working on our
Hamfest for this year.  I think the tables are about $10.00 and all
tailgating and fleamarket areas can and may be inside this year!  Something
is wrong with these prices.

I was going to make the trip this year since I have inherited a now bankrupt
two way shop, don't know now.  I guess I will but I really don't like it!

Paul


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Saturday, March 25, 2006 10:10 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] OT: Dayton Fleamarket space prices?


As I've told a number of people - it looks like they are trying to run it
into the ground. It's not dying fast enough for someone...

When you have THREE CARS in an entire section (the west one - farthest
from the arena) on Sunday, that says something.

I understand getting a reply from the committee is like pulling teeth this
year. In past years, confirmations were received the year before. I know
people who are STILL waiting on space confirmations and we're within two
months.

Joe M.

> Hello,
>
> I know this is off-topic but I don't know where to ask this question.  I
> have sent a email to the Hamfest folks by the way, who knows if they will
> respond.
>
> Has anyone looked at the space price listed on their website?  It is a
> graduated price scheme, the more spaces you buy the more it costs you!
> The
> price for 3 spaces is almost twice what 2 spaces costs!
>
> Why do they do that?  They seem to me to be the highest priced Hamfest,
> anyway this price scheme is just strange!  Who is getting rich there?
> Somebody must be!
>
> Paul
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>






Yahoo! Groups Links














 
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[Repeater-Builder] Re: Dayton Hamvention and other Amateur Flea Markets/Events

[skipp025]

Re: Dayton Hamvention and other Amateur Flea Markets/Events 

> As I've told a number of people - it looks like they 
> are trying to run it into the ground. 

Why would you say that?  As someone semi in the know about 
the Previous 5 to 10 Dayton Flea Markets I've mentioned 
some of the issues in play right here on the group. They're 
trying like he11 to make people happy and go the extra 
mile at Dayton. 

In case you haven't noticed, the larger ham radio flea 
markets in general have been smaller in size. I can see 
clearly see the smaller size of/at many of the long time 
Amateur Events I attend each year. 

Right about the time Nextel and Cell Phones started a 
trek to kill off Land Mobile Radio... all the old time 
Two-Way Dealers went out of business or retired (sold 
out their 800 freqs to Nextel).  So you don't see nearly 
the number of old time two way shop types at the flea 
markets because we/they seem to be a much smaller number. 

I'm happy to report that smart persons doing LMR (Land 
Mobile Radio ... aka commercial two-way radio) and 
providing true radio service are holding up fairly well. 

> It's not dying fast enough for someone...

Actually attendance in general was up over some 
previous years 

> When you have THREE CARS in an entire section (the 
> west one - farthest from the arena) on Sunday, that 
> says something.

Yes it does... there are far fewer people doing two-way 
radio as a business.  One of the first years I was there 
all those sections had non-stop Surplus Radio Dealers 
dumping 800MHz trunking radios by the truck load.  If 
no one buys radios that are useless, the dealers don't 
come back.  Also the weather was pretty bad for 2 years 
straight.  Pouring rain for two of the three days... 

The only trouble last year was Mendelsons trying to 
strong-arm their own space deal at the last minute. 
His last minute strong arm tatic didn't work like he 
thought it would... 

> I understand getting a reply from the committee is 
> like pulling teeth this year. In past years, 
> confirmations were received the year before. I know
> people who are STILL waiting on space confirmations 
> and we're within two months.

I believe the Committee is not who you're supposed to 
contact... more like the Flea Market Chairman/contact?

This year is a new Flea Market Chairman.  Last years 
Chairman my good friend Tom is just an email away. If 
you hang out here I'll send him your comments and get an 
answer.  Wait for a follow up post in the next day or 
two (from me). 

chow for now... 
skipp 

Back to punching the clown...  I mean trying to program 
a 2 watt Pyramid Vehicle Repeater. 









 
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RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?

[Richard]

At the Hamfest that takes place during our EmCommWest ,
admission and space rent is free! It is small compared to the others, but
the price is right.

Richard, N7TGB



-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of Paul Finch
Sent: Saturday, March 25, 2006 8:27 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?


Joe,

Wow, this is weird, I got your reply BEFORE I got the message back from me!
Wonder what's up with that!  I heard something about the owners of the arena
want to discontinue the Hamvention and sell the property or something like
that.  That was two years ago the last time I was at Dayton.

One other thing, our local club here in Azle, Texas is working on our
Hamfest for this year.  I think the tables are about $10.00 and all
tailgating and fleamarket areas can and may be inside this year!  Something
is wrong with these prices.

I was going to make the trip this year since I have inherited a now bankrupt
two way shop, don't know now.  I guess I will but I really don't like it!

Paul


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
Sent: Saturday, March 25, 2006 10:10 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] OT: Dayton Fleamarket space prices?


As I've told a number of people - it looks like they are trying to run it
into the ground. It's not dying fast enough for someone...

When you have THREE CARS in an entire section (the west one - farthest
from the arena) on Sunday, that says something.

I understand getting a reply from the committee is like pulling teeth this
year. In past years, confirmations were received the year before. I know
people who are STILL waiting on space confirmations and we're within two
months.

Joe M.

> Hello,
>
> I know this is off-topic but I don't know where to ask this question.  I
> have sent a email to the Hamfest folks by the way, who knows if they will
> respond.
>
> Has anyone looked at the space price listed on their website?  It is a
> graduated price scheme, the more spaces you buy the more it costs you!
> The
> price for 3 spaces is almost twice what 2 spaces costs!
>
> Why do they do that?  They seem to me to be the highest priced Hamfest,
> anyway this price scheme is just strange!  Who is getting rich there?
> Somebody must be!
>
> Paul
>
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>






Yahoo! Groups Links















Yahoo! Groups Links
















 
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RE: [Repeater-Builder] Info wanted on Mitrek VHF rptr.

[Eric Lemmon]

Doug,

I suspect that your full-duplex radio was used in a mobile telephone system
by Alberta Government Telephones (AGT), which later changed its name to
TELUS.  If there's no selective call decoder in it, or loose wiring
suggesting that one was connected, it might have used multiple PL tones for
simple selection.  Just a thought...

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of n3dab
Sent: Saturday, March 25, 2006 8:46 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Info wanted on Mitrek VHF rptr.

73's  to the Group

The following info appears on a MITREK VHF Mobile repeater.  This is 
a factory (Motorola) built product, NOT an after market modified 
mobile radio.   Can anyone provide any information or documentation 
on this repeater ?  Local searches thru Motorola shops have produced 
nothing.

On the ID plate:   Prim. Pwr. 12v   Motorola Canada Ltd.
Doc. No.   109191038X
 MITREK Type JJA   Watt 2-10
Mod. No.   MX23JJA1106BAZ 
Ser. No.   533PKN1018
Motorola Inc. Made in USA

On chasis behind handle:HUD1052CPR
On the PC bd. near Rcvr.elements:   HLD4082BPR
On frame near Tx elements:  HLD1002BPR
On Controller/PL bd.:   TKN9539BAZ
On PA bd.:  HLD4124APR   and   TLD5591BAZ

Label on top cover reads: " Mobile Communications" and has a "AGT" 
logo.  Probably installed by the service shop.

The Rcvr is fed thru the SO239 on the front of the Chasis, the Xmtr 
is fed out a SO239 on the left rear of the heat sink casting and the 
recess for it was part of the casting process.

This repeater appears to function with the standard control head and 
cable, though I don't have the original but have had it bench tested 
for operation.

TIA for any and all help

Doug   N3DAB 









 
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[Repeater-Builder] Re: Two-Way Radio Shop

[skipp025]

> "Paul Finch" <[EMAIL PROTECTED]> wrote:
> I was going to make the trip this year since I have 
> inherited a now bankrupt two way shop, don't know 
> now.  I guess I will but I really don't like it! 
> Paul

What caused the shop to go bankrupt..? 

Someone once told me not to try and make serious money 
in Ham Radio (for a number of now obvious reasons). A 
number of the flea market spaces are held by people 
trying to make a living fliping radios, used computers 
and surplus electronics.  Don't forget the bootleg 
computer programs... 

In case anyone hasn't noticed there's a serious 
glut of used electronics and dead cars in the US. 

The people now going to Dayton... are there for some of 
the better reasons renewed.  To have fun, meet people, 
see new products, meet up with friends, sell a few used 
things in the parking lot, selling some new products in 
the parking lot as well as getting the word out about 
new products.   F

Not to mention the brauts and fine seating in the 
ice rink... 

cheers, 
skipp 








 
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[Repeater-Builder] AGT = IMTS ?

[skipp025]

Would the Alberta Gov Telephones system be something like 
an IMTS (system) operation?  

Cute to think Motorola came out with something later than 
the Pulsar for IMTS... or was there a UHF/VHF Privacy Plus 
IMTS Phone?  

skipp 

> "Eric Lemmon" <[EMAIL PROTECTED]> wrote:
> I suspect that your full-duplex radio was used in a mobile 
> telephone system by Alberta Government Telephones (AGT), 
> which later changed its name to TELUS.  If there's no 
> selective call decoder in it, or loose wiring suggesting 
> that one was connected, it might have used multiple PL tones for
> simple selection.  Just a thought...
> 
> 73, Eric Lemmon WB6FLY
> 








 
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RE: [Repeater-Builder] AGT = IMTS ?

[Eric Lemmon]

Skipp,

I'm just grasping at straws.  The IMTS is a lot more complex than a simple
duplex system that might have been used internally by AGT rather than by
subscribers.  Back in the late 60's, I used a half-duplex GE Pacer (!) radio
in an MTS system for a couple of years after IMTS became available.  It
would have been better to use a full-duplex radio, but this is what I had at
the time.  The Pacer was an all-tube radio, except for the transistorized
power supply.  It had a mechanical decoder made by Secode.  To make a call,
I had to key the handset for a few seconds, and wait for the mobile operator
to respond.  That was not much more sophisticated than a magneto telephone!
I eventually got kicked off the system because there were only a handful of
people using the manual MTS- everyone was scrambling to get on the IMTS
bandwagon.  Ah, yes... Those were the good old days!

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of skipp025
Sent: Saturday, March 25, 2006 9:01 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] AGT = IMTS ?

Would the Alberta Gov Telephones system be something like 
an IMTS (system) operation?  

Cute to think Motorola came out with something later than 
the Pulsar for IMTS... or was there a UHF/VHF Privacy Plus 
IMTS Phone?  

skipp 

> "Eric Lemmon" <[EMAIL PROTECTED]> wrote:
> I suspect that your full-duplex radio was used in a mobile 
> telephone system by Alberta Government Telephones (AGT), 
> which later changed its name to TELUS.  If there's no 
> selective call decoder in it, or loose wiring suggesting 
> that one was connected, it might have used multiple PL tones for
> simple selection.  Just a thought...
> 
> 73, Eric Lemmon WB6FLY
> 








 
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RE: [SPAM] [Repeater-Builder] Re: Two-Way Radio Shop

[Mike Perryman K5JMP]

Brautwerst, brotchen and beer..  yummies!!  Makes me think of my time in
Germany...
Oh yeah, was in the signal corps..  Army MARS and all that...  does that
count?  
73
Mike
K5JMP
www.k5jmp.us


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] Behalf Of skipp025
Sent: Saturday, March 25, 2006 11:57 PM
To: Repeater-Builder@yahoogroups.com
Subject: [SPAM] [Repeater-Builder] Re: Two-Way Radio Shop



> "Paul Finch" <[EMAIL PROTECTED]> wrote:
> I was going to make the trip this year since I have
> inherited a now bankrupt two way shop, don't know
> now.  I guess I will but I really don't like it!
> Paul

What caused the shop to go bankrupt..?

Someone once told me not to try and make serious money
in Ham Radio (for a number of now obvious reasons). A
number of the flea market spaces are held by people
trying to make a living fliping radios, used computers
and surplus electronics.  Don't forget the bootleg
computer programs...

In case anyone hasn't noticed there's a serious
glut of used electronics and dead cars in the US.

The people now going to Dayton... are there for some of
the better reasons renewed.  To have fun, meet people,
see new products, meet up with friends, sell a few used
things in the parking lot, selling some new products in
the parking lot as well as getting the word out about
new products.   F

Not to mention the brauts and fine seating in the
ice rink...

cheers,
skipp









Yahoo! Groups Links













 
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[Repeater-Builder] The Good Old Days

[Paul Yonge]

Around the 1970s, I had an RCC repeater on 152.12/158.58 MHz in  
Central New York that I used both for paging with Pageboys and Bell &  
Howell pagers and for mobile service to a handful of users.  Most of  
the RCCs owned telephone answering bureaus so we already had "mobile  
operators" who patched calls through our answering switchboards. For  
the small operations that many of us had, it was more of a hobby and  
a convenience to our telephone answering subscribers. Our transceiver  
was a big old RCA (500?) that withstood lots of lightning storms and  
only required a change of its single tube once a year. The days were  
old, good, and a lot of fun. (And I had to sell my little 250-station  
magneto telephone company before I could start the RCC because of the  
separate eligibility requirements for landline and non-landline  
channels.)

Paul Yonge   W2ARK
MIDLAKES REPEATER


On Mar 26, 2006, at 12:24 AM, Eric Lemmon wrote:

> To make a call, I had to key the handset for a few seconds, and  
> wait for the mobile operator
> to respond.  That was not much more sophisticated than a magneto  
> telephone!
> I eventually got kicked off the system because there were only a  
> handful of
> people using the manual MTS- everyone was scrambling to get on the  
> IMTS
> bandwagon.  Ah, yes... Those were the good old days.






 
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Re: [Repeater-Builder] OT: Dayton Fleamarket space prices?

[STeve Andre']

On Saturday 25 March 2006 23:08, Paul Finch wrote:
> Hello,
>
> I know this is off-topic but I don't know where to ask this question.  I
> have sent a email to the Hamfest folks by the way, who knows if they will
> respond.
>
> Has anyone looked at the space price listed on their website?  It is a
> graduated price scheme, the more spaces you buy the more it costs you!  The
> price for 3 spaces is almost twice what 2 spaces costs!
>
> Why do they do that?  They seem to me to be the highest priced Hamfest,
> anyway this price scheme is just strange!  Who is getting rich there?
> Somebody must be!
>
> Paul

I strongly suspect that the price ramp up is to encourage more smaller
spaces and thus increase the diversity of equipment.  I can remember
when friends had real problems getting into the flea market.  I'm pretty
sure there were a lot of double and triple space sellers say 10 years ago.

If you think that this doesn't make sense, you should be emailing the
people there.  Looking at the web site it seems that 
[EMAIL PROTECTED] and [EMAIL PROTECTED] would be good
places to direct your feelings.

--STeve Andre'
wb8wsf  en82




 
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RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?

[n . mckie]

  The originator of the now emcommwest fleamarket used to be fun. 
 One year, I bought a whole series of RCA tube manuals for about 
 $5 for the entire box.  

  Another trip, I bought a roll of half inch Helaix for cheap. 

  The fleamarket used to be held in Reno - but unattached to another 
 event.  I don't have a clue as how well it is doing now. 

  Neil - WA6KLA 


 Original Message 
From: [EMAIL PROTECTED]
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?
Date: Sat, 25 Mar 2006 20:42:23 -0800

>At the Hamfest that takes place during our EmCommWest
>,
>admission and space rent is free! It is small compared to the others,
>but
>the price is right.
>
>Richard, N7TGB
>
>
>
>-Original Message-
>From: Repeater-Builder@yahoogroups.com
>[mailto:[EMAIL PROTECTED] Behalf Of Paul Finch
>Sent: Saturday, March 25, 2006 8:27 PM
>To: Repeater-Builder@yahoogroups.com
>Subject: RE: [Repeater-Builder] OT: Dayton Fleamarket space prices?
>
>
>Joe,
>
>Wow, this is weird, I got your reply BEFORE I got the message back
>from me!
>Wonder what's up with that!  I heard something about the owners of
>the arena
>want to discontinue the Hamvention and sell the property or something
>like
>that.  That was two years ago the last time I was at Dayton.
>
>One other thing, our local club here in Azle, Texas is working on our
>Hamfest for this year.  I think the tables are about $10.00 and all
>tailgating and fleamarket areas can and may be inside this year! 
>Something
>is wrong with these prices.
>
>I was going to make the trip this year since I have inherited a now
>bankrupt
>two way shop, don't know now.  I guess I will but I really don't like
>it!
>
>Paul
>
>
>-Original Message-
>From: Repeater-Builder@yahoogroups.com
>[mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED]
>Sent: Saturday, March 25, 2006 10:10 PM
>To: Repeater-Builder@yahoogroups.com
>Subject: Re: [Repeater-Builder] OT: Dayton Fleamarket space prices?
>
>
>As I've told a number of people - it looks like they are trying to
>run it
>into the ground. It's not dying fast enough for someone...
>
>When you have THREE CARS in an entire section (the west one -
>farthest
>from the arena) on Sunday, that says something.
>
>I understand getting a reply from the committee is like pulling teeth
>this
>year. In past years, confirmations were received the year before. I
>know
>people who are STILL waiting on space confirmations and we're within
>two
>months.
>
>Joe M.
>
>> Hello,
>>
>> I know this is off-topic but I don't know where to ask this
>question.  I
>> have sent a email to the Hamfest folks by the way, who knows if
>they will
>> respond.
>>
>> Has anyone looked at the space price listed on their website?  It
>is a
>> graduated price scheme, the more spaces you buy the more it costs
>you!
>> The
>> price for 3 spaces is almost twice what 2 spaces costs!
>>
>> Why do they do that?  They seem to me to be the highest priced
>Hamfest,
>> anyway this price scheme is just strange!  Who is getting rich
>there?
>> Somebody must be!
>>
>> Paul
>>
>>
>>
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>






 
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[Repeater-Builder] Re: VXR-5000

[Michael Antoine]

 
  Mike, I don't have any info on either the CWID 51B or the VXR-5000, 
I talked to CSC today on thier 800 line, $17.00 for a manual and 
$32.00 for a new call sign PROMM, I have a VXR-5000 Service Manual
somewhere but I can't find the @#$%&* thing, this is typical of me 
lately, My wife tells I'm just getting OLD !!

 Thanks for your efforts,

  Mike A  N1KTD

-
-- In Repeater-Builder@yahoogroups.com, Mike Morris WA6ILQ 
<[EMAIL PROTECTED]> wrote:
>
> At 11:30 AM 03/24/06, you wrote:
> 
> 
> >  Anyone can tell me a simple way to tune a small
> >  6 cavity duplexer on 448 - 443 for a VXR-5000
> >  Vertex repeater, never done one before.
> 
> This group has a lot of readers all across the USA,
> and in many places in the world, and if you say
> where in 1-land you are there is a much better
> chance of someone popping up and saying "I'm
> 25 minutes south of you, come on over".  Or
> something like that.
> 
> >  It's a
> >  Vertex Model DXU "B" series duplexer that I purchase
> >  with the VXR-5000, this is the same repeater that I'm
> >  looking CSC CWID 51B information about, still can't
> >  find my manual to do the pinout,
> 
> Pinout of the VXR, or pinout of the CSC ??
> 
> Mike WA6ILQ
>











 
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RE: [Repeater-Builder] VXR-5000

[[EMAIL PROTECTED]]

  Thanks Eric,

  I don't own a Spectrum Analyzer but I talked to friend at a
  two way shop and he is willing to help a Ham out with showing me
  how and using his equipment, there are still nice people out there
  thank heavens,

  73's for now

  Mike A   N1KTD







 
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[Repeater-Builder] Re: Carrier Operated Relay (COR)

[Zakaria Dahili]

Just to tell the group that "skipp" has provided me with the much 
needed info on the above, Thank You very much. Although I have not 
tried it yet but I am sure it is a very reliable piece of 
information.
Best Regards to all.
Zak (9M2ZC) 

--- In Repeater-Builder@yahoogroups.com, "Zakaria Dahili" 
<[EMAIL PROTECTED]> wrote:
>
> Hi Skipp,
> I just want to take from the speaker output of the RX radio, and 
> feed it to the COR cicuit so that I could activate the PTT on the 
> transmit radio, could you help me with the circuit?
> 
> I prefer to use Motorola GP300
> 
> Thanks
> 9M2ZC
> --- In Repeater-Builder@yahoogroups.com, "skipp025"  
> wrote:
> >
> > Do you plan to open the radios up to add the cor 
> > circuit?  ...Or would/do you want to just use 
> > speaker audio output for (cor & repeat audio) 
> > everything?  Both methods are quite possible... 
> > using the speaker audio out is semi quirky but 
> > very easy to do. 
> > 
> > cheers,
> > skipp 
> > 
> > 
> > > "Zakaria Dahili"  wrote:
> > > HI All, I am new here. Can somebody help me with the circuit 
to 
> build 
> > > the above. What I have in mind is to use 2 Motorola handies 
and 
> > > convert it into a small repeater. I also need the circuit 
which 
> has a 
> > > delay "tail" of about 1.5 secs. Thanks. - de 9M2ZC
> > >
> >
>











 
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[Repeater-Builder] Re: Adding Bandpass Can to Duplexer

[Harold Farrenkopf]

Not exactly right.

The length of the cable between the pass cavity and a notch or pass
reject cavity has to be 1/4 wave length including the length of the
loop in the bandpass cavity and that is why the cable lengths are
different for different cavity brands that have different loop sizes.

If the length of that cable is too short for the mounting arrangement,
then add 1/2 wavelength (in cable) to that short cable.

With a Network analyser, one can see that the length is optimised by
viewing the effects of different cable lengths with respect to the
effect of the total return loss, insertion loss, the bandpass response
(whether it adds properly as opposed to having 2 pass bumps with a dip
in the middle like a camel) and the effect of the individual tuning of
the cavities.  With the proper length cable, one can tune the cavities
individually and when placed together, the tuning is not effected. 
With the wrong lengths, the tuning of the cavities is affected.

I am not familiar with those products mentioned but in Sinclair top
mounted loops between a Q can and a Pass can, the length is 3 to 4"
similar to the feedthrough harness end connection length.

Life is easier with a Network Analyser.

Harold


--- In Repeater-Builder@yahoogroups.com, "Coy Hilton" <[EMAIL PROTECTED]> wrote:
>
> Dwayne, you are right... The cable length Mst be 1/4 electrical wave 
> length to come out right just like the ones on your exesisting 
> duplexer. This is shorter than the calculated wavelength in free 
> space because the RF propegates slower in coax than free space. You 
> have to determine the velocity factor of the cabel that you are 
> using between the duplexer and the cavity and then use it to 
> determine the correct length. Cut the cable as exactly as possible 
> to that length THEN put the connectors on it. 
> 
> I have added a bandpass and and an additoinal reject filter to the 
> receive side of my Duplexer and it works very well. I use a preamp 
> to make up for all the loss.
> 
> Good luck
> AC0Y  
> 
> --- In Repeater-Builder@yahoogroups.com, "ldgelectronics" 
>  wrote:
> >
> > Bob,
> > 
> > I think you got it right on. Placing in random lengths of cables 
> (out 
> > of the junk drawer) between the band pass and the duplexer got 
> > different results. 
> > 
> > Re-reading the VE2AZX duplexer theory paper on the Repeater-
> Builder 
> > web site verified that the cable should be shorter than a 1/4 
> > wavelength.
> > 
> > It seems it's pretty random on what the proper length should be 
> > depending on the can used. The PD-1173 can used a shorter jumper 
> than 
> > a DB-4001 can. This is probably where the right angle connector 
> trick 
> > would come into play.
> > 
> > Thanks for you input, that really helped track it down.
> > 
> > Dwayne Kincaid
> > WD8OYG
> > 
> > 
> > >
> > > I think the length of coax you use between that BP
> > > filter and the rest of the duplexer is critical.
> > > 
> > > I have a 900 MHz duplexer that has a BP filter and a
> > > BP/BR filter on each side. The BP filter gives me 25dB
> > > attenuation 25 MHz away, and the BP/BR gives me about
> > > 45dB. But when connected together with what seems to
> > > be a 1/2 wavelength coax, I get 90dB attenuation. The
> > > whole is greater than the sum of its parts, somehow.
> > > 
> > > I'd suggest trying a piece of coax that's the same
> > > length as what's being used now, which might be 1/4 or
> > > 1/2 wavelength, to couple your BP filter to the
> > > duplexer.
> > > 
> > > Bob M.
> > > ==
> > > --- ldgelectronics 
> > > wrote:
> > > 
> > > > This seems like a perplexing problem. Maybe someone
> > > > can point me in 
> > > > the right direction.
> > > > 
> > > > I have a TPD 1554, 4-can VHF duplexer. It provides
> > > > about 77 db of 
> > > > isolation with 1.4 db of loss. This is just about
> > > > what the spec says, 
> > > > so that all looks good.
> > > > 
> > > > I happen to have some extra PD-1173 VHF band pass
> > > > cans, so I'm 
> > > > thinking of adding a can on each side to get the
> > > > rejection up to 85 
> > > > db or so for use on a VHF repeater (Exec II base
> > > > station at 25 
> > > > watts). 
> > > > 
> > > > The bandpass can by its self shows about 0.5 db loss
> > > > and 8 db of 
> > > > rejection at 600 KHz. The curve on the spectrum
> > > > analyzer looks good 
> > > > and the return loss is very good (-40).
> > > > 
> > > > Here is where it gets messed up. I added a can on
> > > > the duplexer on the 
> > > > radio side (let's just say the RX side). The loss
> > > > goes up to 1.9 db 
> > > > as expected and the return loss is still good. But
> > > > when I go to 
> > > > measure the rejection, it now shows only 73 db. How
> > > > can this be?
> > > > 
> > > > Everything uses double sheilded cable and attenuator
> > > > pads are used on 
> > > > the input and output to the analyzer.
> > > > 
> > > > It seems like the rejection should be additive, but
> > > > for some reason 
> > > > it's not showing