Search found 28 matches

by KG7PAR
Mon Apr 27, 2020 10:19 pm
Forum: DMR Specific Support
Topic: very high BER (~13%)
Replies: 6
Views: 1142

Re: very high BER (~13%)

I think there may be some confusion. There are 3 radios in the mix, 1) the HT (TYT UV-380) which I have measured the TX frequency of, which matches the RX (SM-50). 2) The Rx (SM-50) which I have measured the TX frequency of to check the accuracy of the oscillator. 3) The Tx (SM-50) which so far has ...
by KG7PAR
Mon Apr 27, 2020 6:01 pm
Forum: DMR Specific Support
Topic: very high BER (~13%)
Replies: 6
Views: 1142

Re: very high BER (~13%)

For the first reading on the HT, I used a cheap frequency counter. I have dug out my Agilent 53131A (225MHz capable) and used an antenna for the input. When I key the HT in analog mode, I get a reading of 146.040.0xx. Using a similar technique, I am measuring the TX frequency on the receiver (assumi...
by KG7PAR
Mon Apr 27, 2020 4:06 pm
Forum: DMR Specific Support
Topic: very high BER (~13%)
Replies: 6
Views: 1142

Re: very high BER (~13%)

Thanks good to know on the frequency adjustments, this is all new to me The HT TX is at 146.0391MHz (had to use in analog mode to keep it active long enough to get a reading), the RX is programmed for 146.040 MHz/156.7. I am not able to adjust the settings in the RX radio at the moment, waiting for ...
by KG7PAR
Mon Apr 27, 2020 1:41 am
Forum: DMR Specific Support
Topic: very high BER (~13%)
Replies: 6
Views: 1142

very high BER (~13%)

Pi-Star:4.1.0 / Dashboard:20200421 MMDVM Hardware - Custom designed board (RPI GPIO Hat style). ---Derivative of this design http://www.repeater-builder.com/products/pdfs/STM32_DVM_v3.pdf, same firmware Radios: External SM-50 RX/TX (Duplex) HT: TYT-UV380 Only trying to do DMR at the moment, just wan...
by KG7PAR
Sun Sep 22, 2019 3:06 am
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

Wow, I now understand why I couldn't get it to come out of RO mode. I also found /boot/cmdline.txt also has it in there. I will tackle this tomorrow and see how it goes. I am going to push up an image to my website soon that has my version of mmdvm (RC4 with trunk BUSTER OS) and also svxlink install...
by KG7PAR
Sat Sep 21, 2019 10:16 pm
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

back at it again, no idea why those readings are so inconsistant, I hooked up a frequency counter and the crystals are very stable within a few hertz over a period of time. I have sent one board off to a friend who is far more digital setup knowledgeable to look at as well. I am on to another challe...
by KG7PAR
Sat Sep 14, 2019 9:26 pm
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

I found a reference for those messages, but the results are a bit odd for my board https://github.com/N4IRS/MMDVM-Install/wiki/pos-centre-threshold The pos number is an indication of the detected sync word position. Ideally it should remain constant. If it increments or decrements it is a sign of ti...
by KG7PAR
Sat Sep 14, 2019 9:12 pm
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

okay forward progress (i think) starting to get debug messages when I key up the HT, any chance these mean anything to you? Note these are still with the original firmware M: 2019-09-14 21:09:22.172 MMDVMHost-20190625_Pi-Star-v4 is running M: 2019-09-14 21:09:32.388 DMR, Logged into the master succe...
by KG7PAR
Sat Sep 14, 2019 8:16 pm
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

I am giving the compiling a try now to see how it goes. I found a board bug where I needed to invert the inhibit pin, I thought it was active low so the chip has been inhibited. Got that fixed up now, getting lots of red spaghetti on this board now :-) So I got most of the way through compilation, b...
by KG7PAR
Tue Sep 10, 2019 3:17 am
Forum: Pi-Star General Support
Topic: (RPI) Changing the tty to an external device and validating functionality
Replies: 41
Views: 7853

Re: (RPI) Changing the tty to an external device and validating functionality

here is the menu option I get when I issue the help command, no "e", no shift+F The commands are: H/h Display help Q/q Quit W/w Enable/disable modem debug messages I Toggle transmit inversion i Toggle receive inversion O Increase TX DC offset level o Decrease TX DC offset level C Increase RX DC offs...