Re: Flat Audio - Motorola
I've discovered that the RKR1225 / Specta series radio RSS setting allows you to select "post" or "pre" limiting for the TX audio path for flat inputs on the accessory port.?
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Not familiar with the spectrum radios. Where is the cap? In series with the TX audio input to the transmitter?
?
Also worth noting, and I've found a ton of conflicting information on the site regarding flat TX audio with these radios, you must use pin 5 on the accessory port for TX audio if you expect to have flat audio. Pin 2 is commonly suggested to be used for speech or normal audio from a controller. However, the audio out of the transmitter is pre-emph'd regardless of the "TX Flat Audio Input" setting. I mistakenly thought that setting it to post (not "pre) meant no pre-emphassis on any TX input on the accessory port. This is not the case. If you use pin 2 it's Pre-emph'd period!.?
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I've moved over to using pin 5 with the RSS External Accessory menu item "TX Flat Audio Input" set to "pre". Not seeing any overshoot or excessive deviation at higher frequencies. I'll double-check again today.
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Thanks for your suggestion!
?
Jim? ??
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Re: Sinclair 2037 multicouplers with 220 kHz spacing
Yes, reduce the notch depth of the 144.61 c2037. ?If you do want to tx on the 144.39, then you will need at least 2 Q cans on the 144.39 equipment side and 3 Q cans on the 144.61 to notch out each others carrier and noise. I have no idea on the isolation requirements of those radios at 220 kHz separation. Don¡¯t forget to do an intermod analysis because the 2 unknown to us high band pairs.?
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Re: Flat Audio - Motorola
The flat IOs are for data use....to use the tx flat input for voice, it needs to be limited and filtered externally to prevent overshoot of deviation and bandwidth on squelch noise / noisy signals. I?use the circuit in the SCT110/410 Spectrum transmitters....change the 0.0047 cap on the input to a 4.7uf for no preemphasis..simple ckt and works excellent
Chris WB5ITT?
Sorry,? I found "External Accessories" in the menu. Within the configuration window, I found "Rx Audio Output" was set to "De-emphasized". I changed it to "Flat" and that provided flat audio from the RKR1225 to the controller. I'm still a little foggy on what the EIA/Flat setting does. According to the help menu, it says EIA processes the TX and RX audio and restricts it to 300Hz -3KHz. and conversely, when "FLAT" is selected, there is no processing and limiting can be bypassed. Looking a bit closer. Looks like that may only be valid on pin 5 of the accessory connector and not pin 2. I'm using pin 2, and the transmit audio is being pre-emph'd!? Argh!
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Jim
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Re: Flat Audio - Motorola
Sorry,? I found "External Accessories" in the menu. Within the configuration window, I found "Rx Audio Output" was set to "De-emphasized". I changed it to "Flat" and that provided flat audio from the RKR1225 to the controller. I'm still a little foggy on what the EIA/Flat setting does. According to the help menu, it says EIA processes the TX and RX audio and restricts it to 300Hz -3KHz. and conversely, when "FLAT" is selected, there is no processing and limiting can be bypassed. Looking a bit closer. Looks like that may only be valid on pin 5 of the accessory connector and not pin 2. I'm using pin 2, and the transmit audio is being pre-emph'd!? Argh!
?
Jim
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Re: Flat Audio - Motorola
Privileged info Mick
Might cost a nickel of two
Are you prepared?
queue in THE GREEN DOOR by Jim Lowe 1956
John VK4JKL
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On 22/05/2025 9:57 am, Teton Amateur Radio Repeater Association (TARRA) wrote: But that doesn't tell what you found.
Mick - W7CAT
----- Original Message -----
From: "AA7CL via groups.io"
To: [email protected]
Sent: Wednesday, May 21, 2025 05:24:56 PM
Subject: Re: [repeater-builder] Flat Audio - Motorola
> Ahhhhh, I found it!
>
> Thanks all!
>
> Jim
>
>
> >
>
>
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Re: Flat Audio - Motorola
But that doesn't tell what you found.
Mick - W7CAT
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Show quoted text
----- Original Message ----- From: "AA7CL via groups.io" To: [email protected]Sent: Wednesday, May 21, 2025 05:24:56 PM Subject: Re: [repeater-builder] Flat Audio - Motorola Ahhhhh, I found it!
Thanks all!
Jim
-- Untitled Document
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Re: Flat Audio - Motorola
Ahhhhh, I found it!
?
?
Thanks all!
?
Jim
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Re: Flat Audio - Motorola
The "FLAT/EIA" setting is a Radio Wide Configuration feature. Each channel has provisions for bandwidth and deviation, but nothing for De-emphasis/pre-emphasis.
?
?
Jim
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Re: Flat Audio - Motorola
Here is some info from my notes:
You have to set each channel to flat audio (I cannot confirm this at the moment)
Make sure you set in accessories TX
Flat to Pre limiter for best response. Good luck.
Andy
IIRC, there are a few boxes you have to correctly set the audio.?? I ran into the same issue first time I did an R1225.
Andy
On Wed, May 21, 2025 at 1:41?PM Teton Amateur Radio Repeater Association (TARRA) via <tarra= [email protected]> wrote: He did say "the "flat audio" check box enabled in the RSS software.".
Mick - W7CAT
----- Original Message -----
From: "wj9jrg via "
To: [email protected]
Sent: Wednesday, May 21, 2025 11:00:47 AM
Subject: Re: [repeater-builder] Flat Audio - Motorola
?> You have to change it in CPS. Show the screenshots from CPS, then we can
?> help.
?>
?> Thanks
?>
?> Andy
?> WJ9J
?>
?> On Wed, May 21, 2025 at 12:39?PM AA7CL via >
[email protected]> wrote:
?>
?> > Good Day All,
?> >
?> > Just reaching out to see if anyone has had any issues with Motorola
?> > RKR1225 repeaters not producing flat audio on pin 11 of the
accessory port
?> > with the "flat audio" check box enabled in the RSS software.
?> >
?> > We have 9 of these repeaters and due to audio quality issues, I
want to
?> > switch the repeaters and links to flat audio. I have struggled with
?> > emphasis and de-emphasis filter paths. Some in the controller, some
are
?> > enabled/disabled in the radios themselves. I have tried to
eliminate it
?> > all by going flat audio. However, the audio links from some of the
sites
?> > are still muddy.
?> >
?> > Using a backup repeater I have, I started investigating the issue.
I have
?> > eliminated the de-emph filters on the controller and enabled flat
audio in
?> > the RKR and Astro Spectra (used for the links) for both TX/RX.
However, on
?> > the RKR1225, injecting a signal set for 3KHz deviation to the
receiver, and
?> > varying the tone, the audio level coming from pin 11 on the RKR1225
is 4V
?> > PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off
at higher
?> > freqs. I would expect the opposite?? Switching back to "EIA" in the
RKR
?> > doesn't seem to change anything. Again, I'm checking the level
right at pin
?> > 11 - no controllers in line. Is this some impedance issue? Perhaps a
?> > switching issue inside the RKR1225? Today, going to check the output
?> > impedance spec and see if I can load it to see what difference it
makes.
?> > May try another RKR1225 also.
?> >
?> > I've confirmed the modulation of the SM is flat across those
frequencies.
?> >
?> > Thoughts and ideas are appreciated!
?> >
?> > Jim
?> >
?> >
?> >
?>
?>
?>
?>
?>
?>
--
Untitled Document
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Re: Flat Audio - Motorola
IIRC, there are a few boxes you have to correctly set the audio.?? I ran into the same issue first time I did an R1225.
Andy On Wed, May 21, 2025 at 1:41?PM Teton Amateur Radio Repeater Association (TARRA) via <tarra= [email protected]> wrote:
He did say "the "flat audio" check box enabled in the RSS software.".
Mick - W7CAT
----- Original Message -----
From: "wj9jrg via "
To: [email protected]
Sent: Wednesday, May 21, 2025 11:00:47 AM
Subject: Re: [repeater-builder] Flat Audio - Motorola
?> You have to change it in CPS. Show the screenshots from CPS, then we can
?> help.
?>
?> Thanks
?>
?> Andy
?> WJ9J
?>
?> On Wed, May 21, 2025 at 12:39?PM AA7CL via >
[email protected]> wrote:
?>
?> > Good Day All,
?> >
?> > Just reaching out to see if anyone has had any issues with Motorola
?> > RKR1225 repeaters not producing flat audio on pin 11 of the
accessory port
?> > with the "flat audio" check box enabled in the RSS software.
?> >
?> > We have 9 of these repeaters and due to audio quality issues, I
want to
?> > switch the repeaters and links to flat audio. I have struggled with
?> > emphasis and de-emphasis filter paths. Some in the controller, some
are
?> > enabled/disabled in the radios themselves. I have tried to
eliminate it
?> > all by going flat audio. However, the audio links from some of the
sites
?> > are still muddy.
?> >
?> > Using a backup repeater I have, I started investigating the issue.
I have
?> > eliminated the de-emph filters on the controller and enabled flat
audio in
?> > the RKR and Astro Spectra (used for the links) for both TX/RX.
However, on
?> > the RKR1225, injecting a signal set for 3KHz deviation to the
receiver, and
?> > varying the tone, the audio level coming from pin 11 on the RKR1225
is 4V
?> > PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off
at higher
?> > freqs. I would expect the opposite?? Switching back to "EIA" in the
RKR
?> > doesn't seem to change anything. Again, I'm checking the level
right at pin
?> > 11 - no controllers in line. Is this some impedance issue? Perhaps a
?> > switching issue inside the RKR1225? Today, going to check the output
?> > impedance spec and see if I can load it to see what difference it
makes.
?> > May try another RKR1225 also.
?> >
?> > I've confirmed the modulation of the SM is flat across those
frequencies.
?> >
?> > Thoughts and ideas are appreciated!
?> >
?> > Jim
?> >
?> >
?> >
?>
?>
?>
?>
?>
?>
--
Untitled Document
|
Re: Sinclair 2037 multicouplers with 220 kHz spacing
I didnt explain it very well.
?
In order of appearance from the antenna:
?
1. 144.610 rx? ? ? ? ? ? ? ? ? ? ?c2037
2. highband vhf rx? ? ? ? ? ? c2037
3. 145.210 tx? ? ? ? ? ? ? ? ? ? ?c2037
4. highband vhf tx? ? ? ? ? ? c2037
5. proposed 144.39 rx/tx? c2037
6. highband vhf duplexer Q2330E
?
"The notch depth should be reduced to narrow the width of the notch. If I remember correctly, the notch should be adjusted to 15dB. "
?
If I read your suggestion correctly, It could help to reduce the width of the 144.610 notch via adjustment of the coupling loop?? It should all become clearer when I finish cabling the spare cans to emulate the 144.610 in the next few days.? fwiw, the rptr radios are TKR/NXR, aprs will be cdm-1250
?
?
?
?
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Re: Flat Audio - Motorola
He did say "the "flat audio" check box enabled in the RSS software.".
Mick - W7CAT
toggle quoted message
Show quoted text
----- Original Message ----- From: "wj9jrg via groups.io" To: [email protected]Sent: Wednesday, May 21, 2025 11:00:47 AM Subject: Re: [repeater-builder] Flat Audio - Motorola You have to change it in CPS. Show the screenshots from CPS, then we can
help.
Thanks
Andy
WJ9J
On Wed, May 21, 2025 at 12:39?PM AA7CL via groups.io > [email protected]> wrote:
Good Day All,
Just reaching out to see if anyone has had any issues with Motorola
RKR1225 repeaters not producing flat audio on pin 11 of the
accessory port with the "flat audio" check box enabled in the RSS software.
We have 9 of these repeaters and due to audio quality issues, I
want to switch the repeaters and links to flat audio. I have struggled with
emphasis and de-emphasis filter paths. Some in the controller, some
are enabled/disabled in the radios themselves. I have tried to
eliminate it all by going flat audio. However, the audio links from some of the
sites are still muddy.
Using a backup repeater I have, I started investigating the issue.
I have eliminated the de-emph filters on the controller and enabled flat
audio in the RKR and Astro Spectra (used for the links) for both TX/RX.
However, on the RKR1225, injecting a signal set for 3KHz deviation to the
receiver, and varying the tone, the audio level coming from pin 11 on the RKR1225
is 4V PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off
at higher freqs. I would expect the opposite?? Switching back to "EIA" in the
RKR doesn't seem to change anything. Again, I'm checking the level
right at pin 11 - no controllers in line. Is this some impedance issue? Perhaps a
switching issue inside the RKR1225? Today, going to check the output
impedance spec and see if I can load it to see what difference it
makes. May try another RKR1225 also.
I've confirmed the modulation of the SM is flat across those
frequencies.
Thoughts and ideas are appreciated!
Jim
-- Untitled Document
|
Re: Flat Audio - Motorola
You have to change it in CPS.?? Show the screenshots from CPS, then we can help.
Thanks
Andy WJ9J
Good Day All,
?
Just reaching out to see if anyone has had any issues with Motorola RKR1225 repeaters not producing flat audio on pin 11 of the accessory port with the "flat audio" check box enabled in the RSS software.
?
We have 9 of these repeaters and due to audio quality issues, I want to switch the repeaters and links to flat audio. I have struggled with emphasis and de-emphasis filter paths. Some in the controller, some are enabled/disabled in the radios themselves.? I have tried to eliminate it all by going flat audio. However, the audio links from some of the sites are still muddy.
?
Using a backup repeater I have, I started investigating the issue. I have eliminated the de-emph filters on the controller and enabled flat audio in the RKR and Astro Spectra (used for the links) for both TX/RX. However, on the RKR1225, injecting a signal set for 3KHz deviation to the receiver, and varying the tone, the audio level coming from pin 11 on the RKR1225 is 4V PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off at higher freqs. I would expect the opposite?? Switching back to "EIA" in the RKR doesn't seem to change anything. Again, I'm checking the level right at pin 11 - no controllers in line. Is this some impedance issue? Perhaps a switching issue inside the RKR1225? Today, going to check the output impedance spec and see if I can load it to see what difference it makes. May try another RKR1225 also.
?
I've confirmed the modulation of the SM is flat across those frequencies.
?
Thoughts and ideas are appreciated!
?
Jim
|
Good Day All,
?
Just reaching out to see if anyone has had any issues with Motorola RKR1225 repeaters not producing flat audio on pin 11 of the accessory port with the "flat audio" check box enabled in the RSS software.
?
We have 9 of these repeaters and due to audio quality issues, I want to switch the repeaters and links to flat audio. I have struggled with emphasis and de-emphasis filter paths. Some in the controller, some are enabled/disabled in the radios themselves.? I have tried to eliminate it all by going flat audio. However, the audio links from some of the sites are still muddy.
?
Using a backup repeater I have, I started investigating the issue. I have eliminated the de-emph filters on the controller and enabled flat audio in the RKR and Astro Spectra (used for the links) for both TX/RX. However, on the RKR1225, injecting a signal set for 3KHz deviation to the receiver, and varying the tone, the audio level coming from pin 11 on the RKR1225 is 4V PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off at higher freqs. I would expect the opposite?? Switching back to "EIA" in the RKR doesn't seem to change anything. Again, I'm checking the level right at pin 11 - no controllers in line. Is this some impedance issue? Perhaps a switching issue inside the RKR1225? Today, going to check the output impedance spec and see if I can load it to see what difference it makes. May try another RKR1225 also.
?
I've confirmed the modulation of the SM is flat across those frequencies.
?
Thoughts and ideas are appreciated!
?
Jim
|
Re: DB-224-E antenna sources?
Ya I had seen that one and it was tempting, 6-7 hour drive for me.
Kory
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On 2025-05-21 11:27, W?SVH via groups.io wrote:
If your near Kentucky, there is one listed on Fleabay.
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micor mobile / GE Mastr II Mobile wanted
All,
I am looking for 1-2 Micor Mobiles and/or 1-2 GE Mastr II mobiles potentioally a station if the price is right and its close etc.
I am looking for 100-110w radios, on UHF 450-470mhz.? Please email me offlist at dwisdom@...
Thanks
--Don
KD7WKF
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Re: DB-224-E antenna sources?
If your near Kentucky, there is one listed on Fleabay.
|
Repeaterbuilder has the diagrams for other cables. Can't you use that schematic? or do you need the pinout of the mike connector?
Joe. K1ike
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On 5/21/2025 10:51 AM, Chris Boone WB5ITT via groups.io wrote: Due to my former company keeping my Kenwood programming cables, I'm kind of stuck right now. I've got two tk790s I need to reprogram the frequencies and I know that front panel programming won't allow me to do that. I've got an old microphone with the connector and want to make up my own programming kpg 43 but I can't find the schematic anywhere. Don't be a smart ass and tell me to go buy one, as some people have previously done in other post. I don't have time! I know transmit and receive data is carried on one pin but how do you interface that to a FTDI? Resistors or is a xstr needed? I have searched everywhere and can't find the damn schematic for this thing. I know I used to have it but I lost it on an old hard drive.
TIA
Chris WB5ITT
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That's it!! Tnx John!!
Chris WB5ITT?
Chris, I think that Rob Riggs had something here
On Wed, May 21, 2025 at 2:52?PM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: Due to my former company keeping my Kenwood programming cables, I'm kind of stuck right now. I've got two tk790s I need to reprogram the frequencies and I know that front panel programming won't allow me to do that. I've got an old microphone with the connector and want to make up my own programming kpg 43 but I can't find the schematic anywhere. Don't be a smart ass and tell me to go buy one, as some people have previously done in other post. I don't have time! I know transmit and receive data is carried on one pin but how do you interface that to a FTDI? Resistors or is a xstr needed? I have searched everywhere and can't find the damn schematic for this thing. I know I used to have it but I lost it on an old hard drive.
?
TIA
Chris WB5ITT?
--
John Kreno
The line separating good and evil passes not through states, nor between classes, nor between political parties either¡ªbut right through every human heart¡ªand through all human hearts. This line shifts. Inside us, it oscillates with the years. And even within hearts overwhelmed by evil, one small bridgehead of good is retained. And even in the best of all hearts, there remains ¡ an unuprooted small corner of evil. - Aleksandr Solzhenitsyn
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Chris, I think that Rob Riggs had something here
On Wed, May 21, 2025 at 2:52?PM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: Due to my former company keeping my Kenwood programming cables, I'm kind of stuck right now. I've got two tk790s I need to reprogram the frequencies and I know that front panel programming won't allow me to do that. I've got an old microphone with the connector and want to make up my own programming kpg 43 but I can't find the schematic anywhere. Don't be a smart ass and tell me to go buy one, as some people have previously done in other post. I don't have time! I know transmit and receive data is carried on one pin but how do you interface that to a FTDI? Resistors or is a xstr needed? I have searched everywhere and can't find the damn schematic for this thing. I know I used to have it but I lost it on an old hard drive.
?
TIA
Chris WB5ITT?
-- John Kreno
The line separating good and evil passes not through states, nor between classes, nor between political parties either¡ªbut right through every human heart¡ªand through all human hearts. This line shifts. Inside us, it oscillates with the years. And even within hearts overwhelmed by evil, one small bridgehead of good is retained. And even in the best of all hearts, there remains ¡ an unuprooted small corner of evil. - Aleksandr Solzhenitsyn
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Chris Boone WB5ITT
W?SVH