Re: VHF MTR2000 Poor Receive Performance
Cavity 1: -23DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch at Reject Frequency
Cavity 2 (middle cavity): -30DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch At Reject Frequency
Cavity 3 (closest to antenna port): -29DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -29DB IL/Notch at Reject Frequency The return loss of the first cavity seems off. At 0.4 dB IL I would expect the match to be around -30 dB as you saw with the other two cavities. Is that the cavity that seemed to be giving you problems before? So I found an old post on the group and found I do indeed have the high split harness. I'm hesitant to write off all of the problems you experienced to the harness unless it is damaged. And I wouldn't go any further until seeing what's up with cavity #1. Repeat the same exercise for the cavities on the transmit side. --- Jeff WN3A -- This email has been checked for viruses by Avast antivirus software. www.avast.com
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Re: Quintron Corporation / Glenayre 70cm pager transmitter & Power Supply. Need info.
The boards look like those made by Aerotron. A definite blast from the past of the late 1970's version I used to maintain for hospitals in 160 mhz at multiple sites in NYC and CT. There were lots of them around on all bands and yes they were dirty.
For a real blast these were used with REACH pagers for the hospital paging. A 5 year LiOn battery life with sleep mode.
The ones I worked on were hi power 250 watt, and unfortunately I don't have any documentation from them. You might try looking at some Aerotron radio books of that era.
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Re: Quintron Corporation / Glenayre 70cm pager transmitter & Power Supply. Need info.
Yes, this series (QT6700??) were bad about intermod even with a
good band pass band reject on them. I ended up figuring it was
mixing in the exciter. It could come in if there was any spot on
the cover that was not making perfect RF seal (they never did) or
even coming in on the leads coming into the back of the
transmitter if it was strong enough. The pins on the board that
held the channel elements would corrode and bad about causing
intermod problems.
If you are only using the PA, you should have a lot fewer
problems. I might still have a spare PC somewhere in the junk.
Also a quiet site without all of the IMTS, paging, and other
constant on high power stations will be a great help!
On 11/1/2022 9:05 AM, Burt K6OQK wrote:
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I may be wrong here, but I recall a lot of problems on Mt. Wilson,
and other sites, to broadcast 940 MHz STL's as well as VHF radios
from Quintron paging transmitters.? As I recall, it was when drive
was removed from them that they would oscillate in the final
stage.? The cure was to remove the amplifier's voltage when they
were supposed to be off rather than leaving the amplifiers powered
up and simply removing drive.
Burt, K6OQK
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Re: Connecting Yaesu DR2X Repeater to Raspberry Pi/Allstar?
Is anyone still making outboard CTCSS encode and/or decode boards? CommSpec?
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On 11/1/2022 10:16 AM, Larry Macionski via groups.io wrote: On Mon, Oct 31, 2022 at 03:25 PM, Kevin Custer wrote:
The SC-50 and CT-30 are discontinued because the encoder/decoder IC in no
longer available.
Well, a year ago I codgered up substitution an Arduino Nano ($5) for the CTCSS encoder the DR2X requires if in the remote mode.
I have the "script" you down load to the Aurduino and it outputs a PL tone.? I'd have to do some digging to find my notes but If anyone is interested it's pretty simple. The output pin of the Arduino simply needs a capacitor coupled to a potientiometer then the wiper capacitively coupled to the to the CTCSS input pin and set the level.. The sine wave resulting doen't look bad at all..
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Re: Connecting Yaesu DR2X Repeater to Raspberry Pi/Allstar?
On Mon, Oct 31, 2022 at 03:25 PM, Kevin Custer wrote:
The SC-50 and CT-30 are discontinued because the encoder/decoder IC in no longer available.
Well, a year ago I codgered up substitution an Arduino Nano ($5) for the CTCSS encoder the DR2X requires if in the remote mode. I have the "script" you down load to the Aurduino and it outputs a PL tone.? I'd have to do some digging to find my notes but If anyone is interested it's pretty simple. The output pin of the Arduino simply needs a capacitor coupled to a potientiometer then the wiper capacitively coupled to the to the CTCSS input pin and set the level.. The sine wave resulting doen't look bad at all..
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I can't answer myself, but I know you will need to be more specific. What radio? What software?
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On 11/1/2022 9:27 AM, SCOTT READ wrote: What do I need to do in the motorola programming software and Windows 7 to config the RIM-Maxtrac wit work with Winlink or Vara FM.
_._,_._,_
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Groups.io Links:
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Re: Quintron Corporation / Glenayre 70cm pager transmitter & Power Supply. Need info.
I may be wrong here, but I recall a lot of problems on Mt. Wilson, and other sites, to broadcast 940 MHz STL's as well as VHF radios from Quintron paging transmitters.? As I recall, it was when drive was removed from them that they would oscillate in the final stage.? The cure was to remove the amplifier's voltage when they were supposed to be off rather than leaving the amplifiers powered up and simply removing drive.
Burt, K6OQK
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What do I need to do in the motorola programming software and Windows 7 to config the RIM-Maxtrac wit work with Winlink or Vara FM.
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Are there any CSI-32 controller folks on here??? I have the manual but the factory reset is not working.
--
-
Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
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Quintron Corporation / Glenayre 70cm pager transmitter & Power Supply. Need info.
Hi folks, I have a 45w and a 90w 70cm? transmitter and power supply and need manual or any info. See pics. Google showed install and setup manual for much later (Jan 93) VHF advanced version, but I think too different. QT-4500 series QT-6506 series. I am only using the last stages of RF section being driven with a? CDM750. It's got a huge fan cooled heat sink to support 100% duty paging service. Running at about 80w and 75 watts out of the duplexer should stay cool. Any thoughts are appreciated. Frank N6CES
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Re: VHF MTR2000 Poor Receive Performance
That's great news!
On Monday, October 31, 2022, 04:53:56 PM CDT, Jared Smudde <computerwhiz02@...> wrote:
Cavity 1: -23DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch at Reject Frequency
Cavity 2 (middle cavity): -30DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch At Reject Frequency
Cavity 3 (closest to antenna port): -29DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -29DB IL/Notch at Reject Frequency
So I found an old post on the group and found I do indeed have the high split harness. My harness is roughly 12.5 inches center to center of the Tee connectors. So I took 3 Amphenol tees and found some 14 inch RG400 jumpers and cabled it up and got 1.6DB of IL and was getting well over 105DB notch. No weird behavior like I was getting earlier with the high insertion loss and only 2 of the notch screws working. Look like I need a new harness and I should be good to go?
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Re: VHF MTR2000 Poor Receive Performance
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Re: VHF MTR2000 Poor Receive Performance
Cavity 1: -23DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch at Reject Frequency
Cavity 2 (middle cavity): -30DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -30DB IL/Notch At Reject Frequency
Cavity 3 (closest to antenna port): -29DB Return Loss at Pass Frequency, 0.4DB IL at Pass Frequency, -29DB IL/Notch at Reject Frequency
So I found an old post on the group and found I do indeed have the high split harness. My harness is roughly 12.5 inches center to center of the Tee connectors. So I took 3 Amphenol tees and found some 14 inch RG400 jumpers and cabled it up and got 1.6DB of IL and was getting well over 105DB notch. No weird behavior like I was getting earlier with the high insertion loss and only 2 of the notch screws working. Look like I need a new harness and I should be good to go?
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Re: Connecting Yaesu DR2X Repeater to Raspberry Pi/Allstar?
On 10/31/2022 10:32 AM, Chris Smart
wrote:
Someone asked me yesterday how to connect
an Allstar node to a yaesu DR2X repeater, and mentioned they
would like something plug-and-play. Is the best option?
That page mentions the DR1X. Will it work
as well with the 2X?
?
Do we also need
?
Thank you in advance for any suggestions.
?
73,
Chris
"Best" is subjective.?
The problem with that solution currently is some of the required
products are unavailable.? The SC-50 and CT-30 are discontinued
because the encoder/decoder IC in no longer available.
Many folks are using "just" a RA-DR1X interface by itself with good
results since the issues that MABEL corrected are no longer an issue
with more recent firmware.
Kevin W3KKC
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On 2022-10-31 3:10 p.m., Jeff DePolo WN3A wrote: Looks small enough to be UHF. I can verify when I get home tonight. That would be great! Thanks Jeff. Tedd, VE3TJD
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Jeff, I've attached a picture of the loop. From the connector
to the end of the loop is 1.25" and about 1/2" wide. Looks small enough to be UHF. I can verify when I get home tonight. --- Jeff WN3A -- This email has been checked for viruses by Avast antivirus software. www.avast.com
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Re: VHF MTR2000 Poor Receive Performance
No, this doesn¡¯t sound right at all.? There is either something very wrong with one or more of the cavities, the harness, or test equipment. ? Do this as a sanity check. ? Take the three cavities on the receive side and disconnect them from the harness. ?Confirm (using the VNA S11, tee, and a quality load) that each has maximum return loss at the desired pass frequency; adjust the pass tuning if necessary.? Then set the notch (S21) to the transmit frequency using the trimmer cap (do not re-adjust pass).? Write down the return loss, insertion loss at pass freq, and insertion loss at reject freq for each of the three.? Report back those nine values. ? THEN, using three standard tees and two reasonable lengths of quality coax, connect those three cavities together (i.e. do not use the original harness).? Report back what the insertion loss and return loss are at the pass frequency (don¡¯t care about the notch depth since we know the cables aren¡¯t going to be optimum length). ? Is there any indication that the harness is not original?? A pic is worth a thousand words. ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ? ?
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From: [email protected] <[email protected]> On Behalf Of Jared Smudde
Sent: Monday, October 31, 2022 11:42 AM
To: [email protected]
Subject: Re: [repeater-builder] VHF MTR2000 Poor Receive Performance? I went ahead and tried to work on the receive/high pass side. All 3 cavities were already at their best return loss from when I was working on it the other day. So I went ahead and tuned the notches to a 600KHz split and rotated the loops to get 0.4DB IL per cavity and adjusted the notches back to 600KHz and got 31DB out of the notches. When I called the receive side together, I had almost 7db of insertion loss at the receiver frequency and the notch was way off of where it should have been. Using the notch screws on the 2 cavities closest to the antenna port, I was able to adjust the notch to where it belongs and was getting 90db of notch. However, when I adjusted the 3rd notch screw on the cavity where the receiver connects, all that did was adjust the insertion loss on the pass. I adjusted it to 1.45db of IL and 90db of notch.
Is that right though? I would have expected the 3rd notch screw to also adjust the notch and not the insertion loss on the pass.
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Re: Somewhat OT... imaging a hard drive...
You can do the same thing with version 7.?? ebay item 144675644126
On Mon, Oct 31, 2022 at 2:25 PM M M < wa6ilq@...> wrote: Andy WJ9J wrote:
> For the OP, what was the issue with using Ghost 8 anyway?? It can boot into DOS and backup to any CD / DVD or flash.
Nothing - except that I can't find a copy of Ghost 8.
Jim Aspinwall wrote:
?
>? Just made up two legacy dual-boot DOS and XP laptops for a regional radio shop to keep up service for legacy rigs.?
Which laptop did you use?
I've been using two CF-series Toughbooks for radio programming just because they have a hardware serial port.?
Solves a lot of USB to serial issues.?? I have a CF-27 (288mhz) that boots to MS-DOS (or Win98SE), and a CF30 with 32 bit Win7,
There's a CF29 on the shelf to back up the CF-30.
> Then ask me about USB-RS-232 adapters...
I've had friends that don't have hardware serial ports switch to Mark Dunkle's FTDI cables...
that one step solved a LOT of their radio programming issues.? ()
And for USB debugging situations I pull out a serial adapter with an FTDI chip and individual LEDs for TX and RX ...
Something like this:?
Mike WA6ILQ
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Re: Somewhat OT... imaging a hard drive...
Andy WJ9J wrote:
> For the OP, what was the issue with using Ghost 8 anyway?? It can boot into DOS and backup to any CD / DVD or flash.
Nothing - except that I can't find a copy of Ghost 8.
Jim Aspinwall wrote:
?
>? Just made up two legacy dual-boot DOS and XP laptops for a regional radio shop to keep up service for legacy rigs.?
Which laptop did you use?
I've been using two CF-series Toughbooks for radio programming just because they have a hardware serial port.?
Solves a lot of USB to serial issues.?? I have a CF-27 (288mhz) that boots to MS-DOS (or Win98SE), and a CF30 with 32 bit Win7,
There's a CF29 on the shelf to back up the CF-30.
> Then ask me about USB-RS-232 adapters...
I've had friends that don't have hardware serial ports switch to Mark Dunkle's FTDI cables...
that one step solved a LOT of their radio programming issues.? ()
And for USB debugging situations I pull out a serial adapter with an FTDI chip and individual LEDs for TX and RX ...
Something like this:? https://www.ebay.com/itm/394119149646
Mike WA6ILQ
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Re: Connecting Yaesu DR2X Repeater to Raspberry Pi/Allstar?
Thanks Dean. ? ? ? ? 73, Chris ? ?
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From: [email protected] <[email protected]> On Behalf Of Dean Martinson
Sent: October 31, 2022 1:56 PM
To: [email protected]
Subject: Re: [repeater-builder] Connecting Yaesu DR2X Repeater to Raspberry Pi/Allstar?? Masters Communication Cable is also on his site as where to get it. ? On Mon, Oct 31, 2022, 9:32 AM Chris Smart <ve3rwj@...> wrote: Someone asked me yesterday how to connect an Allstar node to a yaesu DR2X repeater, and mentioned they would like something plug-and-play. Is the best option? That page mentions the DR1X. Will it work as well with the 2X? ? Do we also need ? Thank you in advance for any suggestions. ? 73, Chris ? ?
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Don Clark
Larry Macionski
Burt K6OQK
SCOTT READ - KM6RFB
Karl Shoemaker
Jared Smudde
Kevin Custer