Search found 56 matches
- Thu Feb 07, 2019 11:29 am
- Forum: MMDVM_HS Hat(s)
- Topic: Low RF output
- Replies: 5
- Views: 6529
Re: Low RF output
Problem sorted... This Chinese copy MMDVM board had incorrect parts fitted in the "T" network filter. I removed the components (C27, C28, L1, L2 and C1). Then bridged directly from the junction of C4/C5 to the SMA socket side of C27. While it means the board is running without filtering an...
- Fri Feb 01, 2019 6:45 pm
- Forum: MMDVM_HS Hat(s)
- Topic: Low RF output
- Replies: 5
- Views: 6529
Re: Low RF output
Thanks Brian I’ll check on Monday, but I think it’s the correct parameter. I also have a Pi 3/DVAP. I’ll check that and see what effect the RF parameter has. It would be useful if someone with an RF millivolt meter or spectrum analyser and an MMDVM would check theirs. Maybe many have flea power leve...
- Thu Jan 31, 2019 5:19 pm
- Forum: MMDVM_HS Hat(s)
- Topic: Low RF output
- Replies: 5
- Views: 6529
Re: Low RF output
Thanks Brian
This one has an LCD display that makes access to the L/C output parts awkward.
Should the Pi-Star config alter the RF O/O on the MMDVM boards? My changes had no effect...
73 Dave
This one has an LCD display that makes access to the L/C output parts awkward.
Should the Pi-Star config alter the RF O/O on the MMDVM boards? My changes had no effect...
73 Dave
- Thu Jan 31, 2019 4:27 pm
- Forum: MMDVM_HS Hat(s)
- Topic: Low RF output
- Replies: 5
- Views: 6529
Low RF output
Checking the output power on my Spectrum Analyser, it seems very low at -35dBm. It’s one of the Chinese eBay ones and is set for 434.800 I removed the capacitor to the on-board antenna without any noticeable difference. Altering the RF output under Pi-Star Config makes no difference either. While th...
- Fri Aug 24, 2018 5:13 pm
- Forum: DVAP Dongle
- Topic: 2m DVAP Transmit Lockup Bug
- Replies: 5
- Views: 12806
Re: 2m DVAP Transmit Lockup Bug
I too use a 2m DVAP, but as far as I know have never experienced any lockup, either with Pi-Star or any other Raspberry Pi software. My DVAP is mounted directly on my R/Pi, uses the small stubby antenna, and is set to -10dBm output. I use WiFi and only have the power cable and a short (6") USB ...
- Wed Apr 25, 2018 1:35 pm
- Forum: DVAP Dongle
- Topic: A tip for new Pi-Star users
- Replies: 3
- Views: 11180
A tip for new Pi-Star users
The Windows software for the DVAP dongle, and some Raspberry Pi images, allow you to access the D-Star network with a radio on simplex set to the Dongle frequency and D-Star, ie without being specifically programmed. This doesn't work with Pi-Star. The Pi-Star image will not work unless the radio is...