Search found 934 matches
- Fri May 03, 2024 4:38 pm
- Forum: General discussions
- Topic: RD-5R won't talk to hotspot, what have I done wrong?
- Replies: 7
- Views: 351
Re: RD-5R won't talk to hotspot, what have I done wrong?
Those sort of frequency errors are not unusual and a proper DMR repeater would have no problem with them. Unfortunately most Hotspots use a receiver chip that is not really designed for TDMA and consequently is very critical on frequency. The SDR play doesn't have a very accurate frequency reference...
- Wed May 01, 2024 8:47 pm
- Forum: General discussions
- Topic: RD-5R won't talk to hotspot, what have I done wrong?
- Replies: 7
- Views: 351
Re: RD-5R won't talk to hotspot, what have I done wrong?
It may be that your two radios are on very slightly different frequencies. Most hotspots are excessively fussy about frequency. Do you have a means of comparing the transmit frequency of the two radios? A radio or SDR with a spectrum display would show the difference. You could then use the OpenGD77...
- Sun Apr 28, 2024 9:40 pm
- Forum: Off topic
- Topic: Modification of the Radioditty charger with "TP5100" card at $ 2.
- Replies: 81
- Views: 73370
Re: Modification of the Radioditty charger with "TP5100" card at $ 2.
I don't think so. The charging voltage is defined internally in the chip.
Colin G4EML
Colin G4EML
- Sun Apr 28, 2024 9:32 pm
- Forum: General discussions
- Topic: Simplex repeater possible?
- Replies: 7
- Views: 483
Re: Simplex repeater possible?
The reason the two handhelds can't hear each other is because they are both set for DCDM TS Split mode. They transmit on the selected timeslot but receive on the other one. Hence when set to transmit on TS2 they are actually receiving on TS1. As the guy says this SFR implementation is specific to An...
- Fri Apr 26, 2024 2:35 pm
- Forum: General discussions
- Topic: Simplex repeater possible?
- Replies: 7
- Views: 483
Re: Simplex repeater possible?
Yes, it is called Single Frequency Repeat and is available on high end DMR radios from the likes of Motorola and Hytera. As Daniel says it also needs DCDM support on the handhelds to differentiate the timeslots. It doesn't need a duplexer as it is single frequency. However it does need radio hardwar...
- Thu Apr 25, 2024 10:40 pm
- Forum: Baofeng DM-1701 / Retevis RT-84 specific
- Topic: DM-1701 - Shouldn't it show up as a serial port"
- Replies: 2
- Views: 566
Re: DM-1701 - Shouldn't it show up as a serial port"
You are correct.
The original firmware does not enumerate as a com port.
OpenGD77 does enumerate as a com port in normal use.
Both radios enumerate as an STM DFU device when set to download firmware. (This is defined in the radios bootloader which remains untouched by OpenGD77. )
Colin G4EML
The original firmware does not enumerate as a com port.
OpenGD77 does enumerate as a com port in normal use.
Both radios enumerate as an STM DFU device when set to download firmware. (This is defined in the radios bootloader which remains untouched by OpenGD77. )
Colin G4EML
- Thu Apr 11, 2024 9:55 pm
- Forum: TYT MD-UV380/390 / UV380/390 Plus 10W / Retevis RT-3S / Baofeng DM-1701 / DM-1701B / Retevis RT-84
- Topic: UV380 + DM-1701 Beta 2023 03 08
- Replies: 12
- Views: 3566
Re: UV380 + DM-1701 Beta 2023 03 08
Yes, as mentioned before we know the the radio can do DCDM but we don't know how to do it! As Roger said, DCDM seems to be a vendor specific feature and as such is not well documented in the ETSI DMR spec. Likewise the limited HRC6000 documentation barely mentions it. It might be possible to generat...
- Wed Apr 10, 2024 8:05 pm
- Forum: TYT MD-UV380/390 / UV380/390 Plus 10W / Retevis RT-3S / Baofeng DM-1701 / DM-1701B / Retevis RT-84
- Topic: Flat audio (9600baud G3RUH) data port from SP/MIC?
- Replies: 4
- Views: 1239
Re: Flat audio (9600baud G3RUH) data port from SP/MIC?
In theory it would be possible to have flat audio option for the radio, at least as far as the actual RF chip is concerned. However there is no control over the additional audio components in the microphone and speaker paths. So the end result may not have a flat response, especially at the low freq...
- Mon Apr 08, 2024 10:36 am
- Forum: TYT MD-9600 / Retevis RT-90
- Topic: Odd CTSS decode issue
- Replies: 10
- Views: 1938
Re: Odd CTSS decode issue
Making a recording probably wouldn't help. The tones won't be recorded. It is not unusual for CTCSS to sometimes be affected by individual voices. The transmitting radio should filter out any low frequencies in the voice before adding the CTCSS tone and likewise the receiving radio should filter out...
- Mon Apr 08, 2024 10:23 am
- Forum: TYT MD-UV380/390 / UV380/390 Plus 10W / Retevis RT-3S / Baofeng DM-1701 / DM-1701B / Retevis RT-84
- Topic: DMR not working; analog is fine
- Replies: 10
- Views: 1826
Re: DMR not working; analog is fine
Your description indicates that you are accessing the repeater OK but the content of your transmission is not being accepted. You have checked the talkgroup settings, timeslot and colour code, that only really leaves your user ID. Have you entered it correctly? Some Repeaters will only pass traffic ...