Re: [Repeater-Builder] need app note MC145158 for R100

[Burt Lang]

Do you by chance have an AN- number?  in the 1980s I used to 
subscribe to all the Motorola documents and still have most of them in a 
box.

Burt  VE2BMQ>>>

Barry Buelow wrote:
> Hello
> 
> Does anyone have a copy of the Motorola App NOtes for PLL from about
> 15+ years ago?  I'm looking for some info on the R100 PLL.  I have a
> data sheet but the App Notes had much more useful info.
> 
> I'd take a scanned pdf, paper, whatever..
> 
> Thanks,
> Barry  w0iy
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 

RE: [Repeater-Builder] Re: UHF 4 cavity duplexer DB4076W-A

[Jim Sheldon]

For everyone's information, I'm posting a scanned picture of a hand drawn 
schematic with measured cable lengths on the DB4076W-A I just sold to a member 
of the group.  The frequencies the duplexer is currently tuned to are 463.4 on 
the low side and 468.4 on the high side.  Cable lengths are indicated on the 
drawing.  The picture will be in the Files directory of the group and titled 
DB4076WA.jpg ..
 
Jim Sheldon
W0EB


  _  

From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of 
[EMAIL PROTECTED]
Sent: Sunday, April 01, 2007 5:00 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: UHF 4 cavity duplexer DB4076W-A




I've been trying to find out the lengths of the DB4076 UHF Duplexer cables for 
several years, too. I have several DB4076s without cables that I plan to build 
up with RG-142 as soon as I find out the lengths. I have the original 
tuning/instruction pamphlet from DB Products, which shows the interconnect 
diagram of the cans and "T" adapter, but no cable lengths.

I've emailed several people over the years that have them for sale asking them 
to measure the lengths, and several promised to measure and get back to me but 
never followed through. Every time I see some DB4076s for sale at Dayton, I'm 
always tempted to ask the seller if I can take off the cables and measure them. 
But I never go to Dayton equipped with a tape measure!

Larry




-Original Message- 
From: Bon & Hal 
Sent: Apr 1, 2007 12:08 PM 
To: Repeater-Builder@yahoogroups.com 
Subject: Re: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A 





Thanks for the reply and suggestion.  I'll see what I can learn.
 
HEB

- Original Message - 
From: Jim Sheldon   
To: Repeater-Builder@  yahoogroups.com 
Sent: Saturday, March 31, 2007 7:47 PM
Subject: RE: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A




Unfortunately I don't.  You might do a google search on DB Products - they have 
been acquired by another company and you might be able to get the info from 
them.
 
Jim


  _  

From: Repeater-Builder@  
yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Bon & Hal
Sent: Friday, March 30, 2007 8:02 PM
To: Repeater-Builder@  yahoogroups.com
Subject: Re: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A





Do you have access to a spec sheet with the cable lengths for such a duplexer?  
I too have one that I need to get tuned down into the ham band.  Thanks and 
good luck with the effort to sell.
 
'73
KA9MXW
 

- Original Message - 
From: Jim Sheldon - W0EB   
To: Repeater-Builder@  yahoogroups.com 
Sent: Friday, March 30, 2007 9:29 AM
Subject: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A


Anyone building a UHF repeater, I have a DB Products DB4076W-A rack
mount duplexer that was just taken out of commercial service. The
repeater was replaced with a new Icom that had a built-in duplexer.

It's a 4 cavity bandpass/band reject duplexer and is listed for 450 to
470. I've seen many of these in amateur service so I'm pretty sure it
can be tuned down to 440 without too much trouble. 

This one's in decent shape with only a few scratches and all the
double shielded cavity interconnect cables and connectors are intact.

Asking $300 shipped anywhere in the US.

Anyone interested please contact me off list to [EMAIL PROTECTED] 
 

thanks,

Jim Sheldon - W0EB
Wichita, KS













 

Re: [Repeater-Builder] BPL Obsoleted by More Powerful and Efficient Technology

[Ronny Julian]

Shame they didn't take out an April ad in QST.  "Google competes with 
BPL"!! 

That is one on the best 4/1 jokes I've ever heard!


Don Kupferschmidt wrote:

> Gentlemen,
>  
> Although not entirely related to repeater building, take a look at this:
>  
> Introducing Google TiSP (BETA), our new FREE in-home wireless 
> broadband service.
> Sign up today and we'll send you your TiSP self-installation kit, 
> which includes setup guide,
> fiber-optic cable, spindle, wireless router and installation CD.
>  
> They claim the following -
>  
>
> *TiSP in-home wireless broadband is:*
>
>*
>
>   Free, fast and highly reliable
>
>*
>
>   Easy to install -- takes just minutes
>
>*
>
>   Vacuum-sealed to prevent water damage
>
> http://www.google.com/tisp/ 
>  
> But being April 1st, I wonder if this "Cinderella offer" is going to 
> turn into a "Pumpkin" at  GMT.
>  
> Don, KD9PT
>  
> PS:  Credit is given to the PWF group, in which this story originated 
> from (and I am a member of).
>  
>  
>  
>  
>  
>  
>  
>
>  
>
>  

[Repeater-Builder] need app note MC145158 for R100

[Barry Buelow]

Hello

Does anyone have a copy of the Motorola App NOtes for PLL from about
15+ years ago?  I'm looking for some info on the R100 PLL.  I have a
data sheet but the App Notes had much more useful info.

I'd take a scanned pdf, paper, whatever..

Thanks,
Barry  w0iy

RE: [Repeater-Builder] Need bandpass specs on EMR Model 6557/SNA

[Gary Schafer]

If you can't find the info from EMR you can look at most anyone's 7" cavity
specs and they will be very similar. Sinclair should have that info on their
web site.

73
Gary  K4FMX

> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of Gran Clark
> Sent: Sunday, April 01, 2007 9:18 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Need bandpass specs on EMR Model 6557/SNA
> 
> Hi All
> 
> Need bandpass cavity specs on EMR Model 6557/SNA
> 
> This is a single box 7"X 7" X 12".  With a single nob adjustment and
> and two  "N"  connectors on the top end.
> 
> Didn't DB products purchase EMR or part of their product line?
> 
> Gran
> 
> K6RIF
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 

Re: [Repeater-Builder] 2 Micor Uhf receivers to trade

[va2dq]

Mark
thanks for your reply,
i received 3 response yet 
i am looking for low split vhf receiver,in my 147 mhz zone 
i am working on modifying and old pager unit based 
on micor repeaater
it received in uhf and retx in vhf on 141??? mhz
i dont have any parts here but i have a big manual
red is his color from motorola

73/s gervais ve2ckn
bic,quebec

  - Original Message - 
  From: N9WYS 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Wednesday, March 28, 2007 10:51 PM
  Subject: RE: [Repeater-Builder] 2 Micor Uhf receivers to trade


  Gervais,

  Is the receiver you're looking for low band or high band VHF? I have a low
  band VHF receiver (39 MHz) that I'd gladly exchange for your UHF ones... I'm
  using a SpectraTAC system with remote UHF receivers, so I can always use
  receiver boards on UHF.

  73 de Mark - N9WYS

  -Original Message-
  From: Repeater-Builder@yahoogroups.com On Behalf Of gervais

  hi all

  i have 2 Uhf Micor Receivers that i just dismantle from a Micor
  Repeater,

  there were in the 414.6250 mhz

  i think the parts number is TLE8821ABR or ADR ,,,it is badly stamped on
  the board,the channel element are there

  i would trade them for 1 Vhf receiver TLD8272B

  you can find me here at the group or via packet at

  VE2CKN @VE2RXY.#EQC.QC.CAN.NOAM

  73/s

  gervais,ve2ckn



   

RE: [Repeater-Builder] measuring coax for duplexer

[Gary Schafer]

Cables between cavities include the length of the coupling loops in the
cavities. They are measured from the bottom of one loop, the cable, to the
bottom of the loop in the next cavity. You need to figure the velocity
factor of the cable and the velocity factor of each loop separately as the
cable has a specific velocity factor and the loop will have a velocity
factor of air.

The cables that go to the T are measured from the bottom of the loop again
as above to the center of the T connector.

A notch cavity will provide about 30 to 35 db of notch depth. Each
interconnecting cable provides an additional 10 db or so of notch depth when
its length is right. Don't forget that the transmit side cables are tuned to
the receive frequency just like the transmit notches are.

The cable on the transmit side to the T provides a high impedance at the
receive frequency because the notch in the transmit cavity is a short
circuit at the receive frequency. That reflects a high impedance or open
circuit at the center of the T connector thru the quarter wave length at the
receive frequency.

The cable on the receive side provides a high impedance at the transmit
frequency at the T because the notch in the receive cavity is tuned to the
transmit frequency and provides a short there. The quarter wave length cable
reflects that short to a high impedance or open circuit at the T to the
transmit frequency. Ideally you could disconnect the receive cable at the T
and it should not effect the transmit power flow to the antenna.

When the transmit energy gets to the T connector it sees a high impedance
going to the receiver and a lower impedance (50 ohms) going out to the
antenna line so it takes that path.

When a receive signal comes in it sees a high impedance in the transmit path
at the T and a low impedance (50 ohms) to the receiver path.

The cables that connect to the T connector are necessary to provide
transmitter/receiver isolation so power flows in the right direction. If
they were not properly tuned there would be a lot of suck out of transmit
power and receive energy going to the wrong path.

The same thing is done on a transmit combiner where each transmitter has a
pass band cavity (it could be done with notch cavities instead). The cavity
isolation between transmitters needs to be around 10 db on each side in
order to provide the isolation so that the power goes to the antenna and not
to the other transmitter. So the other transmitter must be 10 db down on the
skirt of the opposite transmitters pass band skirt. You can think of these
cavities as switches. The same type of thing goes on at the T connection of
a duplexer.

73
Gary  K4FMX


> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of w6nct
> Sent: Sunday, April 01, 2007 7:26 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] measuring coax for duplexer
> 
> PRIMARY CONCERN:  I am in the process of building a 70cm repeater and
> need to know how to measure and test the physical and electrical
> length of the short coax cables linking the (band-pass/notch) duplexer
> cavities.
> 
> I read somewhere that these cables should be an odd multiple of 1/4
> wavelength at the operational frequency.  In my case, a 1/4 wave cable
> won't easily reach between cavities; so I am using one that is
> approximately 3/4 wavelength.
> 
> QUESTION #1:  Due to the Tx/Rx split, I would expect these cable
> lengths might need to be different between the Tx cavities and the Rx
> cavities, assuming that I can make the cables this close to a target
> length.  However, I am now wondering how much this small of a
> difference might matter.  Should I be concerned about this small of a
> difference in the cable lengths (i.e., approximately 0.2")?
> 
> 
> QUESTION #2:  My next problem came when I tried calculating the
> "physical length" for these cables.  I did the calculations for my
> operational frequency on the test pair, even trying to allow for the
> velocity factor (Vf = 0.695) for the RG-400 cable; but I'm not sure
> where to measure the cable length with respect to the type-N
> connectors.  At 70cm even a 1/4" will impact the effective wavelength
> of these jumper cables; so this measurement seems relativel critical.
> 
> CALCULATIONS:
>   wavelength(ft) = 983.6 / [frequency(MHz) * Vf]
> 
>   for 3/4 wavelength cables,...
> Tx @ 446.860MHz (L = 3 * 4.5893" = 13.7679")
> Rx @ 441.860MHz (L = 3 * 4.6413" = 13.9239")
> 
> If I install the type-N connector on one end of a 14" piece of RG-400,
> at what point should I measure and cut it for the other type-N connector?
> 
> 
> QUESTION #3:  When I prototyped up a couple cables, I tried to confirm
> that I was in the right ball-park for their length.  I tried measuring
> their electrical using my MFJ-269 analyzer.
> 
> For reference, I set the analyzer for a 270 degree (i.e., 3/4
> wavelength) cable length, and tried to measure the electrical c

RE: [Repeater-Builder] Need bandpass specs on EMR Model 6557/SNA

[Eric Lemmon]

Gran,

Contact EMR for this information, at 

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Gran Clark
Sent: Sunday, April 01, 2007 6:18 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Need bandpass specs on EMR Model 6557/SNA

Hi All

Need bandpass cavity specs on EMR Model 6557/SNA

This is a single box 7"X 7" X 12". With a single nob adjustment and 
and two "N" connectors on the top end.

Didn't DB products purchase EMR or part of their product line?

Gran

K6RIF

RE: [Repeater-Builder] Tuning duplexers with sweep generator?

[Gary Schafer]

Duplexers and cavities have been tuned for many years without a tracking
generator or spectrum analyzer. It is a little easier with a tracking
generator or even a spectrum analyzer and a signal generator. But you can do
the job with a signal generator that you can keep on frequency and a
receiver. It helps to have some kind of signal level meter on the receiver
but you can also just tune for quieting by riding the generator level so
that the receiver is always noisy. That way you can hear if the level goes
up or down.

Using a sweep generator works fine for tuning pass band cavities or even the
pass band part of a pass/notch type duplexer but you can't tune the notches
with a sweep generator. The reason being is that the detector is not
sensitive enough for the low signal levels that you need to work with. A
typical diode detector will only work at about -20 to -30 dbm. Even if your
sweep generator is able to put out +20 dbm that only lets you look down -40
to -50 db and the duplexer notch is going to be (hopefully) in excess of -70
db. You will never find the peak of the notch.

So just a signal generator preferably a synthesized unit so you know what
frequency it is on. You could use a tunable generator and a frequency
counter but lots of generators tend to shift frequency slightly when you
crank up the output level (high enough for the counter to see) and you will
be working with the signal attenuated down to -80 to -100 dbm most of the
time while tuning the duplexer. You can not afford to have the signal shift
around or drift while you are trying to tune things as it doesn't take much
of a frequency shift to mess up your tuning.

With a good generator tune the pass bands at the proper frequencies first.
Then tune the notches at the opposite frequencies. On the transmit cavities
you would tune the pass to the transmit frequency and then tune their
notches to the receive frequency etc.
Then tune the pass tuning at the proper frequency again now that you have
everything in the ball park. Then tune the notches again at the proper
frequencies.

ALWAYS tune the notches last. Do NOT touch the pass tuning again when you
are done with the notch tuning. Tuning the pass just slightly will throw the
notch way off.

Be sure and have a dummy load on the port of the duplexer you are not
working with and preferably 6 to 10 db pads on each of the ports that you
are working with or you may not have the same tuning when you hook it up to
your radio.

73
Gary  K4FMX


> -Original Message-
> From: Repeater-Builder@yahoogroups.com [mailto:Repeater-
> [EMAIL PROTECTED] On Behalf Of w6nct
> Sent: Sunday, April 01, 2007 7:39 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: [Repeater-Builder] Tuning duplexers with sweep generator?
> 
> 
> I was recently told (by another ham) that I could ONLY tune up my 70cm
> duplexer cavities using something called a "tracking generator".
> Unfortunately I do not have one; and judging the prices I have seem
> for things with that name on the web, I doubt that I can easily budget
> to purchase one.
> 
> For some reason, I thought that my father used to tune up resonant
> cavities using a sweep generator, oscilloscope, and a frequency
> counter; but I don't recall the exact setup he used.
> 
> I inherited his Wavetek (Model #1080, 1GHz) sweep generator,
> oscilloscope, and frequency counter.  I also have access to an
> IFR-1100 service monitor, if I need it (i.e., can be borrowed from a
> friend).
> 
> Can I tune up my 70cm duplexer cavities using the equipment I have?
> 
> If so, could someone please indicate the test setup and procedure.
> 
> Thank-you.
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 

RE: [Repeater-Builder] Tuning duplexers with sweep generator?

[Eric Lemmon]

Your informant is essentially correct.  A sweep generator is an instrument
that generates an AF or RF signal either linearly or logarithmically between
a start and an end frequency.  By itself, it is useless for tuning cavities.
However, when its sweep voltage is coupled to an oscilloscope's horizontal
input, then we have a tool to visually characterize a cavity.  A spectrum
analyzer is essentially an oscilloscope with its input filter being driven
by a sweep generator.

A tracking generator is not really a separate piece of equipment, but is
simply an output of the spectrum analyzer that can be used to excite the
unit under test.  The "tracking" in the name means that this signal
generator is synchronized exactly with the sweep of the spectrum analyzer.
Thus, the display on the analyzer is a graphic representation of the
frequency response of the unit under test.

A spectrum analyzer with a tracking generator, or better still, a vector
network analyzer, are ideal for tuning duplexers, notch and bandpass
filters, and ferrite isolators.

73, Eric Lemmon WB6FLY
 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of w6nct
Sent: Sunday, April 01, 2007 4:39 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Tuning duplexers with sweep generator?


I was recently told (by another ham) that I could ONLY tune up my 70cm
duplexer cavities using something called a "tracking generator". 
Unfortunately I do not have one; and judging the prices I have seem
for things with that name on the web, I doubt that I can easily budget
to purchase one.

For some reason, I thought that my father used to tune up resonant
cavities using a sweep generator, oscilloscope, and a frequency
counter; but I don't recall the exact setup he used.

I inherited his Wavetek (Model #1080, 1GHz) sweep generator,
oscilloscope, and frequency counter. I also have access to an
IFR-1100 service monitor, if I need it (i.e., can be borrowed from a
friend).

Can I tune up my 70cm duplexer cavities using the equipment I have?

If so, could someone please indicate the test setup and procedure.

Thank-you.

[Repeater-Builder] R2008D Service Monitor

[Tony Lelieveld]

Hi Gang,

My Motorola R2008D service monitor went "pooof" the other day, blew the 
AC fuse and let the all important smoke out of a certain part.  I have 
traced the problem to, what appears to be, a blown up RT (MOV?) on 
the "A3" power supply module.  Can anyone please supply me with a 
schematic for this module and/or a part number for the RT?

I am posting a picture of the module on the list site which shows RT1 
and , what I assume is, RT2 which is the one that the smoke escaped out 
of.

Thanks for any replies es 73.
Tony VE3DWI

[Repeater-Builder] Need bandpass specs on EMR Model 6557/SNA

[Gran Clark]

Hi All

Need bandpass cavity specs on EMR Model 6557/SNA

This is a single box 7"X 7" X 12".  With a single nob adjustment and 
and two  "N"  connectors on the top end.

Didn't DB products purchase EMR or part of their product line?

Gran

K6RIF

Re: [Repeater-Builder] License renewal

[Bob Underwood]

Don

I did mine on FCC.gov recently; I'd give the site high marks for ease of 
use. First thing you will have to do is apply for a FRN number. You will 
need a password. When that's set up, the rest is easy, just log on and 
check the boxes. I agree, I don't see any reason to go with the third 
party outfits for a ham license.


Bob U. AA6BT

Kris Kirby wrote:

On Mon, 2 Apr 2007, Don Kupferschmidt wrote:
  
Has anyone on the list used fcc.gov, been able to navigate through it, 
and successfully renewed their license?


How easy / hard is it?  Does anyone out there have a step by step 
instruction list to use as a guide?



Was "fairly" easy for me, but I've been around computers for a while. 
Once you get an FRN number for the License in question, it is mostly 
point and click, iirc. I think it didn't cost me anything to renew, and 
I got to keep my original date of licensing (which makes it very easy 
for me to remember since it's popular number combination). 
 
  

Or, is there a web site out there that can help me?



No idea, I did it on my own.

  

I'm not looking to use a 3rd party provider if I can do this alone.



I wouldn't use a 3rd party provider anyway. Unless it was a commercial 
license. There are certain hooks there that it would be best to seek 
appropriate commercial assistance with.


--
Kris Kirby <[EMAIL PROTECTED]>
"The illegal we do immediately.  The unconstitutional takes
 a bit longer." -- Henry Kissinger




 
Yahoo! Groups Links







  

[Repeater-Builder] Re: Tuning duplexers with sweep generator?

[nj902]

You can use a sweep generator and scope for swept alignment of 
filters and duplexers.  The manual for your sweeper should show the 
setup & procedure.

If you don't have the manual, try BAMA or other internet sites.

You will need an RF detector probe or preferably a detector such as 
the HP 423A or 423B crystal detectors.  These have a 50 ohm 
interface to the device you are tuning and provide a rectified 
output to drive the vertical deflection of your scope.

The scope horizontal is driven by a ramp voltage from the sweeper.  
Using the scope in X-Y display mode thereby provides a display of 
device response versus frequency.

Be aware that your display will be linear whereas a spectrum 
analyzer + tracking generator display - or a network analyzer 
display - will look like the duplexer manufacturer's spec sheet with 
a logarithmic vertical axis.

You gan also tune the duplexer using the generator in the IFR along 
with a receiver that has a receive signal level indication - even 
your repeater's receiver and a test meter showing the limiter.

-


--- In Repeater-Builder@yahoogroups.com, "w6nct" <[EMAIL PROTECTED]> wrote:

"... For some reason, I thought that my father used to tune up 
resonant cavities using a sweep generator, oscilloscope, and a 
frequency counter; but I don't recall the exact setup he used.

I inherited his Wavetek (Model #1080, 1GHz) sweep generator, 
oscilloscope, and frequency counter.  I also have access to an IFR-
1100 service monitor, if I need it (i.e., can be borrowed from a 
friend).

Can I tune up my 70cm duplexer cavities using the equipment I 
have? .."

Re: [Repeater-Builder] License renewal

[Kris Kirby]

On Mon, 2 Apr 2007, Don Kupferschmidt wrote:
> Has anyone on the list used fcc.gov, been able to navigate through it, 
> and successfully renewed their license?
> 
> How easy / hard is it?  Does anyone out there have a step by step 
> instruction list to use as a guide?

Was "fairly" easy for me, but I've been around computers for a while. 
Once you get an FRN number for the License in question, it is mostly 
point and click, iirc. I think it didn't cost me anything to renew, and 
I got to keep my original date of licensing (which makes it very easy 
for me to remember since it's popular number combination). 
 
> Or, is there a web site out there that can help me?

No idea, I did it on my own.

> I'm not looking to use a 3rd party provider if I can do this alone.

I wouldn't use a 3rd party provider anyway. Unless it was a commercial 
license. There are certain hooks there that it would be best to seek 
appropriate commercial assistance with.

--
Kris Kirby <[EMAIL PROTECTED]>
"The illegal we do immediately.  The unconstitutional takes
 a bit longer." -- Henry Kissinger

[Repeater-Builder] Re: Tuning duplexers with sweep generator?

[kb5vjy]

Greetings,

I use a Signal generator (Wavetek 3007 signal generator) and a 
Spectrum Analyzer Tektronix 7613 O scope with the 7L12 Spectrum 
Analyzer module)  Tune them up just fine here with that.


All a tracking generator is in a Spectrum Analyzer for what you are 
using it for is a signal generator.

73 de Joe KB5VJY

 --- In Repeater-Builder@yahoogroups.com, "w6nct" <[EMAIL PROTECTED]> wrote:
>
> 
> I was recently told (by another ham) that I could ONLY tune up my 
70cm
> duplexer cavities using something called a "tracking generator". 
> Unfortunately I do not have one; and judging the prices I have seem
> for things with that name on the web, I doubt that I can easily 
budget
> to purchase one.
> 
> For some reason, I thought that my father used to tune up resonant
> cavities using a sweep generator, oscilloscope, and a frequency
> counter; but I don't recall the exact setup he used.
> 
> I inherited his Wavetek (Model #1080, 1GHz) sweep generator,
> oscilloscope, and frequency counter.  I also have access to an
> IFR-1100 service monitor, if I need it (i.e., can be borrowed from 
a
> friend).
> 
> Can I tune up my 70cm duplexer cavities using the equipment I have?
> 
> If so, could someone please indicate the test setup and procedure.
> 
> Thank-you.
>

[Repeater-Builder] Tuning duplexers with sweep generator?

[w6nct]

I was recently told (by another ham) that I could ONLY tune up my 70cm
duplexer cavities using something called a "tracking generator". 
Unfortunately I do not have one; and judging the prices I have seem
for things with that name on the web, I doubt that I can easily budget
to purchase one.

For some reason, I thought that my father used to tune up resonant
cavities using a sweep generator, oscilloscope, and a frequency
counter; but I don't recall the exact setup he used.

I inherited his Wavetek (Model #1080, 1GHz) sweep generator,
oscilloscope, and frequency counter.  I also have access to an
IFR-1100 service monitor, if I need it (i.e., can be borrowed from a
friend).

Can I tune up my 70cm duplexer cavities using the equipment I have?

If so, could someone please indicate the test setup and procedure.

Thank-you.

Re: [Repeater-Builder] License renewal

[Steven Samuel Bosshard \(NU5D\)]

IF you are a member of the ARRL they can help you and there is no charge.  
www.arrl.org 73, Steve NU5D - Hope my sons will be so thoughtful when the time 
comes.  sb

[Repeater-Builder] measuring coax for duplexer

[w6nct]

PRIMARY CONCERN:  I am in the process of building a 70cm repeater and
need to know how to measure and test the physical and electrical
length of the short coax cables linking the (band-pass/notch) duplexer
cavities.  

I read somewhere that these cables should be an odd multiple of 1/4
wavelength at the operational frequency.  In my case, a 1/4 wave cable
won't easily reach between cavities; so I am using one that is
approximately 3/4 wavelength.  

QUESTION #1:  Due to the Tx/Rx split, I would expect these cable
lengths might need to be different between the Tx cavities and the Rx
cavities, assuming that I can make the cables this close to a target
length.  However, I am now wondering how much this small of a
difference might matter.  Should I be concerned about this small of a
difference in the cable lengths (i.e., approximately 0.2")?


QUESTION #2:  My next problem came when I tried calculating the
"physical length" for these cables.  I did the calculations for my
operational frequency on the test pair, even trying to allow for the
velocity factor (Vf = 0.695) for the RG-400 cable; but I'm not sure
where to measure the cable length with respect to the type-N
connectors.  At 70cm even a 1/4" will impact the effective wavelength
of these jumper cables; so this measurement seems relativel critical.

CALCULATIONS:
  wavelength(ft) = 983.6 / [frequency(MHz) * Vf]

  for 3/4 wavelength cables,...
Tx @ 446.860MHz (L = 3 * 4.5893" = 13.7679")
Rx @ 441.860MHz (L = 3 * 4.6413" = 13.9239")   

If I install the type-N connector on one end of a 14" piece of RG-400,
at what point should I measure and cut it for the other type-N connector?


QUESTION #3:  When I prototyped up a couple cables, I tried to confirm
that I was in the right ball-park for their length.  I tried measuring
their electrical using my MFJ-269 analyzer.

For reference, I set the analyzer for a 270 degree (i.e., 3/4
wavelength) cable length, and tried to measure the electrical cable
length of the initial (approximately 14" long) cables; before I cut
and installed the second type-N connectors.  Adjusting the frequency
even closer, I came out with a resonant frequency (i.e., lowest SWR)
at around 420 MHz, presumably indicating that the cables were long. 
The analyzer also indicated a 1.2' length for the initial setting of
270 degrees; which seemed about right.  Assuming a target frequency at
around 444 MHz (i.e., mid-way between Tx and Rx frequencies for test
case), a 420 MHz resonance would indicated that the cables should be
cut down to approximately 95% of their length.  If this is correct, I
should cut the cables down to somewhere around (14" * 0.95) 13.3". 
This seemed quite a bit shorter than the caculated length (around
13.8" (+/- 0.1")); so wanted to validate my test methodology as well.
 Am I doing this correctly?


Thank-you in advance for your assistance.

[Repeater-Builder] License renewal

[Don Kupferschmidt]

Hi to all list members,

I need to renew my father's amateur radio license shortly.

Has anyone on the list used fcc.gov, been able to navigate through it, and 
successfully renewed their license?

How easy / hard is it?  Does anyone out there have a step by step instruction 
list to use as a guide?

Or, is there a web site out there that can help me?

I'm not looking to use a 3rd party provider if I can do this alone.

TIA to all who reply.

Don, KD9PT

Re: [Repeater-Builder] Re: wanted ISD1420p Voice chip

[DCFluX]

We got you in there for 4 Bob.

These are avalible free of charge, I just want an envelope so I don't have
to fight at the post office.

Yeah, ISD seemed to stop caring when they got bought out by Winbond. I
switched to a seperate company my self as I am not impressed with the
precision of the chips and the way they have to be programmed.

[Repeater-Builder] SIXTH ANNUAL LAS VEGAS VoIP CONFERENCE

[Nevada Amateur Radio Repeaters, Inc.]

SIXTH ANNUAL LAS VEGAS VoIP CONFERENCE 

 

Meet on Friday April 13,  2007 at 6 PM for ad hoc dinner at Rio’s São Paulo
Cafe Program all day Saturday and half day-Sunday April 15, 2007 starting at
7:30 AM.  .

 

Everyone is welcome!!  See the following URLs for more information and
Registration Form.

 

 http://www.narri.org/Annual_IRLP_Conference.html  , 

 http://www.narri.org/IRLP_Conference_Details.html

 http://www.narri.org/IRLP_Conference_Registration_Form.html 

 

 SLEEPING ROOMS  

 

No more sleeping rooms at special rate at Imperial Palace.  Use
www.hotels.com   or other means to check
availability and rates elsewhere.

 

ATTENDIES LIST 

 

VE7LTD David

W7AOR Kent 

K6CRS Carl

N3KZS Ralph

AH6GR Randy

K6JWN Jim

N9GPY Rich

KC9HMK Millie

W9PEP Paul 

K5MES Harold 

KE7FGB Stephen

WB5EKU Don

WA0OJS Ron

WD4OXQ John

N0OBG James

KE4EPS Lu

WB2SNN Charles 

--

KC6HUR Randy

KE6PCV Marshall

K7IZA Mark

W7HTL Phil

WA6ZFT Steve

WB6NIL Jim 

 

Contact Kent W7AOR at NARRI dot ORG for information.

You may also call me on Western Reflector 9250 or 702-452-4412.

 

 

 

Re: [Repeater-Builder] BPL Obsoleted by More Powerful and Efficient Technology

[Dick]

You can download all the tech details at:  www.wefooledu.com  LOL

Dick

- Original Message - 
From: Don Kupferschmidt
To: Repeater-Builder@yahoogroups.com
Sent: 01 April, 2007 23:33
Subject: [Repeater-Builder] BPL Obsoleted by More Powerful and Efficient 
Technology


Gentlemen,

Although not entirely related to repeater building, take a look at this:

Introducing Google TiSP (BETA), our new FREE in-home wireless broadband 
service.
Sign up today and we'll send you your TiSP self-installation kit, which 
includes setup guide,
fiber-optic cable, spindle, wireless router and installation CD.

They claim the following -

TiSP in-home wireless broadband is:
Free, fast and highly reliable
Easy to install -- takes just minutes
Vacuum-sealed to prevent water damage
http://www.google.com/tisp/

But being April 1st, I wonder if this "Cinderella offer" is going to turn 
into a "Pumpkin" at  GMT.

Don, KD9PT

PS:  Credit is given to the PWF group, in which this story originated from 
(and I am a member of). 

Re: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A

[Bon & Hal]

Thanks for the reply and suggestion.  I'll see what I can learn.

HEB
  - Original Message - 
  From: Jim Sheldon 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Saturday, March 31, 2007 7:47 PM
  Subject: RE: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A



  Unfortunately I don't.  You might do a google search on DB Products - they 
have been acquired by another company and you might be able to get the info 
from them.

  Jim




From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf 
Of Bon & Hal
Sent: Friday, March 30, 2007 8:02 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A



Do you have access to a spec sheet with the cable lengths for such a 
duplexer?  I too have one that I need to get tuned down into the ham band.  
Thanks and good luck with the effort to sell.

'73
KA9MXW

  - Original Message - 
  From: Jim Sheldon - W0EB 
  To: Repeater-Builder@yahoogroups.com 
  Sent: Friday, March 30, 2007 9:29 AM
  Subject: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A


  Anyone building a UHF repeater, I have a DB Products DB4076W-A rack
  mount duplexer that was just taken out of commercial service. The
  repeater was replaced with a new Icom that had a built-in duplexer.

  It's a 4 cavity bandpass/band reject duplexer and is listed for 450 to
  470. I've seen many of these in amateur service so I'm pretty sure it
  can be tuned down to 440 without too much trouble. 

  This one's in decent shape with only a few scratches and all the
  double shielded cavity interconnect cables and connectors are intact.

  Asking $300 shipped anywhere in the US.

  Anyone interested please contact me off list to [EMAIL PROTECTED]

  thanks,

  Jim Sheldon - W0EB
  Wichita, KS





   

[Repeater-Builder] Iam after

[Steve]

Hi
Iam in the UK and Iam after a UHF duplexer suitable for
433/434 amateur band use, 1.6Mhz split.

Thanks

Steve

[Repeater-Builder] Re: wanted ISD1420p Voice chip

[Bob Buford]

Matt,

I have four (4) of the partial NHRC-2 kits here and will need the voice
chips for them.  Never dreamed they would stop making the chips.

Let me know how to reimburse you and the padded envelope will be in the mail
on Monday.

 

Thanks,

Bob W5RAB


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.24/741 - Release Date: 3/31/2007
8:54 PM
 

RE: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A

[Jim Sheldon]

Unfortunately I don't.  You might do a google search on DB Products - they
have been acquired by another company and you might be able to get the info
from them.
 
Jim


  _  

From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Bon & Hal
Sent: Friday, March 30, 2007 8:02 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A





Do you have access to a spec sheet with the cable lengths for such a
duplexer?  I too have one that I need to get tuned down into the ham band.
Thanks and good luck with the effort to sell.
 
'73
KA9MXW
 

- Original Message - 
From: Jim Sheldon - W0EB   
To: Repeater-Builder@ 
yahoogroups.com 
Sent: Friday, March 30, 2007 9:29 AM
Subject: [Repeater-Builder] FS: UHF 4 cavity duplexer DB4076W-A


Anyone building a UHF repeater, I have a DB Products DB4076W-A rack
mount duplexer that was just taken out of commercial service. The
repeater was replaced with a new Icom that had a built-in duplexer.

It's a 4 cavity bandpass/band reject duplexer and is listed for 450 to
470. I've seen many of these in amateur service so I'm pretty sure it
can be tuned down to 440 without too much trouble. 

This one's in decent shape with only a few scratches and all the
double shielded cavity interconnect cables and connectors are intact.

Asking $300 shipped anywhere in the US.

Anyone interested please contact me off list to [EMAIL PROTECTED]
 

thanks,

Jim Sheldon - W0EB
Wichita, KS





 

Re: [Repeater-Builder] wanted ISD1420p Voice chip

[George Henry]

I bought mine (for an NHRC 2) from Jameco Electronics..  very 
reasonable and very FAST shipping.

George, KA3HSW / WQGJ413


- Original Message - 
From: "n3dab" <[EMAIL PROTECTED]>
To: 
Sent: Saturday, March 31, 2007 7:15 PM
Subject: [Repeater-Builder] wanted ISD1420p Voice chip


>I am looking for 2 or more ISD 1420p voice chips.  Does anyone have any
> they can part with.   Contact me on or off the group with price and
> quantity available if you can help.  TIA
>
> Doug  n3dab @ arrl . net
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>

[Repeater-Builder] BPL Obsoleted by More Powerful and Efficient Technology

[Don Kupferschmidt]

Gentlemen,

Although not entirely related to repeater building, take a look at this:

Introducing Google TiSP (BETA), our new FREE in-home wireless broadband service.
Sign up today and we'll send you your TiSP self-installation kit, which 
includes setup guide,
fiber-optic cable, spindle, wireless router and installation CD.

They claim the following -

TiSP in-home wireless broadband is:

  a.. Free, fast and highly reliable

  b.. Easy to install -- takes just minutes

  c.. Vacuum-sealed to prevent water damage

http://www.google.com/tisp/

But being April 1st, I wonder if this "Cinderella offer" is going to turn into 
a "Pumpkin" at  GMT.

Don, KD9PT

PS:  Credit is given to the PWF group, in which this story originated from (and 
I am a member of).

[Repeater-Builder] RCA 500 UHF Repeater

[kb5vjy]

Whole or Parted out... a RCA 500 Repeater... Trading for GE Mastr II 
UHF if possable.. or controllers.. or duplexers... Anything traded for 
will be used in the North Louisiana South Arkansas UHF repeater System.

For more information read my VHF Micor Trade Post.

reply here or via email to jholland at nbc10news dot net

73 de Joe KB5VJY

[Repeater-Builder] Re: Midland WR-100 Weather Receiver w/S.A.M.E. Decoder Interface "HOWTO"

[kb5vjy]

Wonderful IDEA.. I will have to try that out on my CAT-200D... Any 
idea where the COS/COR on that unit might be?

73 de Joe KB5VJY
--- In Repeater-Builder@yahoogroups.com, "crackedofn0de" <[EMAIL PROTECTED]> 
wrote:
>
> I just interfaced one of these to an Arcom RC210 controller for
> automatic announcement and broadcast of NOAA warnings in my county.  
If
> you're interested, see below URL for a photo with the hookup points. 
> This turned out to be pretty simple and works just as an expensive
> commercial rack mount weather receiver, but for about $40.
> 
> http://n0de.org/k7icu/r/wr100.html 

> 
> James K7ICU
>