Good morning,
I am using a Motorola CDM1250 for my node. I am using the DMK URI. I am wondering if is necessarry change de JU551 switch to position B as is recommended to be able to use this radio properly.
Thank you for your assistance.
Al
W4RAM
There are no physical jumpers in the CDM series (750/1250/1550) of radios.
The GM300 is the radio that has the JU551; it controls de-emphasis.
Mike
···
On Mon, Jan 7, 2019 at 11:25 AM w4ram@outlook.com <w4ram@outlook.com> wrote:
Good morning,
I am using a Motorola CDM1250 for my node. I am using the DMK URI. I am wondering if is necessarry change de JU551 switch to position B as is recommended to be able to use this radio properly.
Thank you for your assistance.
Al
W4RAM
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Mike is correct. This is all controlled in the cps.
Corey n3fe
···
On Mon, Jan 7, 2019 at 2:33 PM Mike Lee ksixmju@gmail.com wrote:
There are no physical jumpers in the CDM series (750/1250/1550) of radios.
The GM300 is the radio that has the JU551; it controls de-emphasis.
Mike
On Mon, Jan 7, 2019 at 11:25 AM w4ram@outlook.com w4ram@outlook.com wrote:
Good morning,
I am using a Motorola CDM1250 for my node. I am using the DMK URI. I am wondering if is necessarry change de JU551 switch to position B as is recommended to be able to use this radio properly.
Thank you for your assistance.
Al
W4RAM
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CDMs are stupid simple to connect to a URI. Just need discriminator rx audio, ground, xmit flat audio, and ptt. IIRC, rear connector pins 3, 5, 7, 11 (check the multitude of online sites for the specifics, but this is what I recall)
set up radio in CPS to send the right signals to the right pins, turn off pre/deemphasis in radio, do all the rest (COS, pl decode/encode, de/preemphasis, etc) in asterisk.
log in, radio-tune-menu to set levels and squelch, you are good to go.
Take longer to wire the cable up than to get the sw working, in my experience.
Simplest and fastest way.
···
On Jan 7, 2019, at 14:40, Corey Dean n3fe@repeater.net wrote:
Mike is correct. This is all controlled in the cps.
Corey n3fe
On Mon, Jan 7, 2019 at 2:33 PM Mike Lee ksixmju@gmail.com wrote:
There are no physical jumpers in the CDM series (750/1250/1550) of radios.
The GM300 is the radio that has the JU551; it controls de-emphasis.
Mike
On Mon, Jan 7, 2019 at 11:25 AM w4ram@outlook.com w4ram@outlook.com wrote:
Good morning,
I am using a Motorola CDM1250 for my node. I am using the DMK URI. I am wondering if is necessarry change de JU551 switch to position B as is recommended to be able to use this radio properly.
Thank you for your assistance.
Al
W4RAM
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DMs are stupid simple to connect to a URI. Just need discriminator rx
audio, ground, xmit flat audio, and ptt. IIRC, rear connector pins 3, 5,
7, 11 (check the multitude of online sites for the specifics, but this is
what I recall)set up radio in CPS to send the right signals to the right pins, turn off
pre/deemphasis in radio, do all the rest (COS, pl decode/encode,
de/preemphasis, etc) in asterisk.
I have some example codeplugs for transmit and receive radios. I built a test
node a couple months back for dev use and used CDMs. I will put them up on
the wiki <https://wiki.allstarlink.org> once I get the uploader working for
cpg files.
Some pics of the repeater:
Note, I put in two DE-9's for connecting to the audio interface, one is simple
usb, the other is usbradio.
I did run into one issue on the CDM, as the transmit CDM was a UHF 2 that I
brought down to cover 440-517 MHz (from 450-527). The deviation response vs
modulation frequency (modulation balance) was way off, even after aligning to
the Motorola standard.
What I found was motorola says to use a 80 Hz and a 3000 Hz at the same level
to align the balance in tuner. The issue is by 3000 Hz the radio is already
rolling off, and this distorts the modulation balance. The solution i found
was to align it using 80 and 2500 Hz. This makes the radio look like a known
good radio.
Made a little graph of it here if anyone is interested.
Again, OT here and likely not applicable unless you're needing to completely
re-align the radio due to moving the frequency.
Take longer to wire the cable up than to get the sw working, in my
experience.
Verification of perfection is what takes the longest.
73's
···
On 1/7/19 9:39 PM, Bryan D. Boyle wrote:
--
Bryan Fields
727-409-1194 - Voice
http://bryanfields.net
which takes even LESS time…
···
On Jan 8, 2019, at 12:27, Scott Zimmerman n3xcc@repeater-builder.com wrote:
Take longer to wire the cable up than to get the sw working, in my experience.
That’s why I made a radio interface that plugs directly into the back of the radio.Check out the RIM_Maxtrac: http://www.repeater-builder.com/products/usb-rim-lite.html
Scott
Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531On 1/7/2019 9:39 PM, Bryan D. Boyle wrote:
CDMs are stupid simple to connect to a URI. Just need discriminator rx audio, ground, xmit flat audio, and ptt. IIRC, rear connector pins 3, 5, 7, 11 (check the multitude of online sites for the specifics, but this is what I recall)
set up radio in CPS to send the right signals to the right pins, turn off pre/deemphasis in radio, do all the rest (COS, pl decode/encode, de/preemphasis, etc) in asterisk.
log in, radio-tune-menu to set levels and squelch, you are good to go.
Take longer to wire the cable up than to get the sw working, in my experience.
Simplest and fastest way.Bryan
Sent from my iPhone 6S…No electrons were harmed in the sending of this message.
On Jan 7, 2019, at 14:40, Corey Dean <n3fe@repeater.net mailto:n3fe@repeater.net> wrote:Mike is correct. This is all controlled in the cps.
Corey n3fe
On Mon, Jan 7, 2019 at 2:33 PM Mike Lee <ksixmju@gmail.com mailto:ksixmju@gmail.com> wrote:
There are no physical jumpers in the CDM series (750/1250/1550) of radios. The GM300 is the radio that has the JU551; it controls de-emphasis. Mike On Mon, Jan 7, 2019 at 11:25 AM w4ram@outlook.com <mailto:w4ram@outlook.com> <w4ram@outlook.com <mailto:w4ram@outlook.com>> wrote: > > Good morning, > > I am using a Motorola CDM1250 for my node. I am using the DMK URI. I am wondering if is necessarry change de JU551 switch to position B as is recommended to be able to use this radio properly. > > Thank you for your assistance. > > Al > W4RAM > _______________________________________________ > App_rpt-users mailing list > App_rpt-users@lists.allstarlink.org <mailto:App_rpt-users@lists.allstarlink.org> > [http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users](http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users) > > To unsubscribe from this list please visit [http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users](http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users) and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button" > You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. _______________________________________________ App_rpt-users mailing list App_rpt-users@lists.allstarlink.org <mailto:App_rpt-users@lists.allstarlink.org> [http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users](http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users) To unsubscribe from this list please visit [http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users](http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users) and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button" You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
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