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Re: VHF Range 2 Quantar

 

That looks very useful mike.? Do you have a part number for it?
Re: Motorola Quantar 5MHz Reference Ultra High Stability Oscillator CLN1477A

 

Yes, but a $100 eBay GPSDO plugged into a stock Quantar is cheaper and more accurate.?
Re: Motorola R100 eeproms or lack of them

 

And my final comment, the R-100 repeater was not very reliable and was plagued with power supply problems. Of the two I had here both had failed power supplies when I put them in storage and when I retrieved them many years later neither would transmit or receive. Both went in the trash can.?
Re: Motorola R100 eeproms or lack of them

 

To add, the R-100 programming software runs on DOS and does not use the old RIB interface, its a simple to make serial type cable.?
Re: Motorola R100 eeproms or lack of them

 

I had a couple of R-100 repeaters and they appear to have specific designed tx and rx boards and not from any mobile I've seen. The repeater is also programmed by software and not EEPROMS, I have the software somewhere and maybe even a programming cable but its been a good 30yrs since I've worked on one.?
Kenwood NXR-800 Repeaters For Sale

 

I have several of these very cool, high spec, 1U repeaters available. If you are looking to get into NXDN or just want a high quality repeater this is something to consider. They will easily program into the ham band but will need some VCO tweaking. I can do that for you if you provide RX and TX frequencies. These are only 5W units although a power module swap could make this into a 25W-50W unit. $500 including shipping to lower 48. Thanks!

NXR-800-2.jpg
NXR-800-3.jpg
NXR-800-4.png
NXR-800-1.jpg

Re: Motorola R100 eeproms or lack of them

 

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The R-1801 is a suitcase programmer. ?

The R-100 is a small Motorola repeater built from 2 modified mobiles. ?
See:?


I believe the OP is looking for a piece of software that can program a new EEPROM to replace a bad one. ?(A piece of software that I wish I had)

Hope that helps,

Will


On Mar 21, 2025, at 7:38?PM, MILLIN SEE via groups.io <motorolarentals@...> wrote:

?I believe that R100 is a suitcase Programmer


----- Original Message -----
From: Pienari via groups.io <ssb27.2020@...>
To: [email protected]
Sent: Fri, 21 Mar 2025 12:42:44 -0600 (MDT)
Subject: [repeater-builder] Motorola R100 eeproms or lack of them

Hi.
Have anyone make-cp.exe for R100 ?.
Motorola Quantar 5MHz Reference Ultra High Stability Oscillator CLN1477A

 

Are the subject modules of any value for HAM use on VHF Analog Quantar repeaters?
?
?
Re: Motorola R100 eeproms or lack of them

 

I believe that R100 is a suitcase Programmer

----- Original Message -----
From: Pienari via groups.io <ssb27.2020@...>
To: [email protected]
Sent: Fri, 21 Mar 2025 12:42:44 -0600 (MDT)
Subject: [repeater-builder] Motorola R100 eeproms or lack of them

Hi.
Have anyone make-cp.exe for R100 ?.
Motorola R100 eeproms or lack of them

 

Hi.
Have anyone make-cp.exe for R100 ?.
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

Thank you!!!

Mick - W7CAT

----- Original Message -----
From: "Bob KK6RQ via groups.io"
To: [email protected]
Sent: Friday, March 21, 2025 03:46:42 AM
Subject: Re: [repeater-builder] Testing a WACOM WP-678-R2 with a Nanovna-F

Don't conflate "diplexer" (those solid metal box fixed-filters that
let you put a dualband radio with separate VHF/UHF ports to a single dualband antenna or vice-versa) with a "duplexer" (what you're trying to tune for your repeater)




--
Untitled Document
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

If your checking through loss of the pass and the notch is accidently too close in frequency it will add more insertion loss. Just make sure the notch is set at the correct offset before measuring overall insertion loss.?
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

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You're welcome, Don.

One clarification....
The WACOM series of duplexers generally were provided with variable capacitors with enough range to allow the filter to be configured with the notch either above or below the pass frequency.? In other words - each side of the duplexer can be configured for LPHR or HPLR.

One comment....
1.35 dB insertion loss per cavity seems suspect.? I would have expected it to be 0.5 dB, resulting in a total cabled loss of around 1.4 dB or less.? You didn't mention what your total cabled parameters ended up being - so you may want to let us know.

Kevin W3KKC

On 3/20/2025 11:02 PM, Don Roden wrote:

Thanks Kevin,
This was a diplexer that was on my 443 repeater.? ?I bought the repeater/diplexer as a package years ago.
It always had a 25% reflected out of the transmitter.? ? I had been looking at some broadcast FM filters with notches, and before I put the Nanovna up, I thought this would be a good time to look at the WACOM.? The S11 looked horrible.. not at all as I expected.? ?I purchased the repeater years before the Nanovna was introduced.
?
I found that the capacitors? were on the wrong frequency side of the notch? ( all these years ) .... After I saw the effects of the capacitor, it took a few back and fourths to get the null and the broad peak separated by 5Mhz .? ?By the way, the Nanovna-F was calibrated nuts-on on both 443Mhz and 448Mhz.? ? -1.35 and -21.25? were the single cavity readings.
Combined, there was some minor tweaking that had both notches aligned and both rejects aligned.? ? I tightened everything up and the notches stayed on frequency.
Back in-line and zero reflected on the transmitter. Great !!? ?I'm looking forward to seeing a much improved range on the repeater.? ? Thanks Again Kevin
Don W4DNR? ? WA4NPL/R? 443Mhz
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

Don't conflate "diplexer" (those solid metal box fixed-filters that let you put a dualband radio with separate VHF/UHF ports to a single dualband antenna or vice-versa) with a "duplexer" (what you're trying to tune for your repeater)
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

Thanks Kevin,
This was a diplexer that was on my 443 repeater.? ?I bought the repeater/diplexer as a package years ago.
It always had a 25% reflected out of the transmitter.? ? I had been looking at some broadcast FM filters with notches, and before I put the Nanovna up, I thought this would be a good time to look at the WACOM.? The S11 looked horrible.. not at all as I expected.? ?I purchased the repeater years before the Nanovna was introduced.
?
I found that the capacitors? were on the wrong frequency side of the notch? ( all these years ) .... After I saw the effects of the capacitor, it took a few back and fourths to get the null and the broad peak separated by 5Mhz .? ?By the way, the Nanovna-F was calibrated nuts-on on both 443Mhz and 448Mhz.? ? -1.35 and -21.25? were the single cavity readings.
Combined, there was some minor tweaking that had both notches aligned and both rejects aligned.? ? I tightened everything up and the notches stayed on frequency.
Back in-line and zero reflected on the transmitter. Great !!? ?I'm looking forward to seeing a much improved range on the repeater.? ? Thanks Again Kevin
Don W4DNR? ? WA4NPL/R? 443Mhz
Re: Does anyone have a manual or schematic for the Helper Instruments PS 250

 

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Mike,

I found that page on rptrbldr also.

Its not much but better than nuthin.

Thanks for the bit of history. I didn't know that before.

I have one of the Helper millivoltmeters. It sure works well for me.

Sure are a lot for sale on Ebay without the probe. Fortunately I got one at a reasonable price with the probe.

Did you see that design for a homebuilt probe? Somewhere here on rptrbldr I think.

thanks again.

--
73s
Brian
w7fdd
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

On Mar 20, 2025, at 10:26?PM, pu5aom.t via groups.io <pu5aom.t@...> wrote:

?
Hello,
What would a 3 dB pad be?
<— 3dB fixed attenuator.
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

Hello, Chris Boone WB5ITT!
?
Is the service monitor better than a NANO VNA for cavity tuning?
?
?
Na quarta-feira, 19 de mar?o de 2025 às 17h16, Chris Boone WB5ITT escreveu:

monitor de servi?o
Re: Testing a WACOM WP-678-R2 with a Nanovna-F

 

Hello,
What would a 3 dB pad be?
?
?
On Wed, Mar 19, 2025 at 05:16 PM, Chris Boone WB5ITT wrote:

3db pads
Re: VHF Range 2 Quantar

 

Its nice to have the Quantar channel selector module when programming a bunch of frequencies to test.?
?
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