OpenGD-77 for the Baofeng DM-1801

VK3KYY
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Re: OpenGD-77 for the Baofeng DM-1801

Post by VK3KYY » Sat Mar 07, 2020 8:37 pm

Thanks

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kd2lh
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Hotspot Re: OpenGD-77 for the Baofeng DM-1801

Post by kd2lh » Sat Mar 07, 2020 8:41 pm

I've loaded the DM-1801 firmware, and have it programmed using the OpenGD77 CPS.

Here's a photo of it operating in HotSpot mode:
IMG_0177-1s.jpg
IMG_0177-1s.jpg (69.1 KiB) Viewed 539 times
I noticed open squelch and hi RF noise levels (especially on VHF) when I first loaded the software and programmed it.
Last edited by kd2lh on Sat Mar 07, 2020 9:22 pm, edited 1 time in total.

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kd2lh
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Re: OpenGD-77 for the Baofeng DM-1801

Post by kd2lh » Sat Mar 07, 2020 8:56 pm

Also...

CAST is working correctly.

The CWID is working, but the tone sound volume is very low and there is white noise on the FM signal transmitted.

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Re: OpenGD-77 for the Baofeng DM-1801

Post by VK3KYY » Sat Mar 07, 2020 9:51 pm

kd2lh wrote:
Sat Mar 07, 2020 8:56 pm
Also...

CAST is working correctly.

The CWID is working, but the tone sound volume is very low and there is white noise on the FM signal transmitted.
Can you check the DTMF tone volume on FM, as I think the CWID uses the DTMF tone generator.

If those tones are also weak, its possibly because the calibration is incorrect, and you should look at the Analog Tx deviation section in the calibration.

You could also try increasing those values in the calibration and see if it helps.

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kd2lh
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Re: OpenGD-77 for the Baofeng DM-1801

Post by kd2lh » Sun Mar 08, 2020 1:26 am

Yes. All analog audio is low and there is loud hiss. Here's the calibration in the radio:
DM-1801_Calibration-UHF.jpg
DM-1801_Calibration-UHF.jpg (68.21 KiB) Viewed 514 times
What would be reasonable levels for deviation and audio?

IF changed under the experimental OpenGD77 CPS, can I restore the original firmware if needed and have accurate calibration settings?

Marc

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Re: OpenGD-77 for the Baofeng DM-1801

Post by VK3KYY » Sun Mar 08, 2020 2:36 am

kd2lh wrote:
Sun Mar 08, 2020 1:26 am
Yes. All analog audio is low and there is loud hiss. Here's the calibration in the radio:

DM-1801_Calibration-UHF.jpg

What would be reasonable levels for deviation and audio?

IF changed under the experimental OpenGD77 CPS, can I restore the original firmware if needed and have accurate calibration settings?

Marc
Those values look normal for the FM tone modulation settings.

You can restore the original firmware, and it should work (after you've restored a Baofeng codeplug - assuming you changed the codeplug), because all I do is make a copy of the calibration to address 0xF000 , so that I don't need to make a separate version of the CPS for the GD-77 and the DM-1801

And the address I used (0xF000) is AFIK not used by either the GD-77 or the 1801 official firmware.

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kd2lh
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Re: OpenGD-77 for the Baofeng DM-1801

Post by kd2lh » Sun Mar 08, 2020 2:14 pm

Then the "Overall Gain" for those areas may be low at "39"?

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Re: OpenGD-77 for the Baofeng DM-1801

Post by kd2lh » Sun Mar 08, 2020 4:17 pm

I think I figured out the low CWID audio level.

viewtopic.php?f=17&t=726&p=6467#p6467

What is the FM channel bandwidth used while sending the ID? Is it 12.5 khz or 25 khz?

Marc KD2LH

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Re: OpenGD-77 for the Baofeng DM-1801

Post by Kg4tda » Sun Apr 26, 2020 12:40 am

THAT ANYONE KNOWS WHERE ON THE TOP ORANGE BUTTON> FILTTERS:CTCSS DONT SEE
DCS OPTION

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Re: OpenGD-77 for the Baofeng DM-1801

Post by VK3KYY » Sun Apr 26, 2020 1:08 am

Kg4tda wrote:
Sun Apr 26, 2020 12:40 am
THAT ANYONE KNOWS WHERE ON THE TOP ORANGE BUTTON> FILTTERS:CTCSS DONT SEE
DCS OPTION
DCS is still in development.

See viewtopic.php?f=4&t=135&p=7557&hilit=DCS#p7557

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