I have an MMDVM_HS and am getting a 1.0-1.5% BER with a -475 offset. This is a JumboSPOT that I purchased to play with. I already have 2x DVMega.
Has anybody tried swapping the TXCO for a higher quality one to remove the offset and decrease the BER?
Regards,
Chris Andrist, KC7WSU
Decrease BER %
Re: Decrease BER %
What you have is a relatively good BER already. I wouldn't bother.
Try a little fine tuning, changes in steps of 2 or 5 might bring it down a little more. Anything 1.0 or below is fine for home use.
Andrew M1DNS, (Mod)
Try a little fine tuning, changes in steps of 2 or 5 might bring it down a little more. Anything 1.0 or below is fine for home use.
Andrew M1DNS, (Mod)
Andrew M1DNS.
Pi-star Admin Team.
Pi-star Admin Team.
Re: Decrease BER %
Hi Chris,
or the tx power could be high, if your work with the hotspot in the same room. HF is disturbing eletronic devices a little bit.
Best regards
Kai
dh3ybe
or the tx power could be high, if your work with the hotspot in the same room. HF is disturbing eletronic devices a little bit.
Best regards
Kai
dh3ybe
Re: Decrease BER %
Hi
I have during 0,2% to 0,4% in BER (green color) with RXOffset/TXOffset -300. Try to use this value.
I have during 0,2% to 0,4% in BER (green color) with RXOffset/TXOffset -300. Try to use this value.
73! Anton aka Tony
EL #2102, EL #53698, DMR #2503041, XLX937-B
Clubs: RC5C, RY3AAL, NMDXC
EL #2102, EL #53698, DMR #2503041, XLX937-B
Clubs: RC5C, RY3AAL, NMDXC
Re: Decrease BER %
Each individual hotspot can require a different offset. If you're experiencing high (greater than 1%) Bit Error Rate (BER) with your radio, you can try reducing it by adjusting the RX Offset:
- Set up Pi-Star with the MMDVMHost Configuration Mode you want to use. Be sure to apply changes.
- The best way to work on this is to have Pi-Star open in two browsers:
- Set up the first to view the Expert Editor, where you'll do the adjustments:
- Enter Expert Editor: pi-star.local/admin/expert.
- Click MMDVMHost.
- Scroll down to the Modem section and find the RXOffset setting.
- Set up the second to view the dashboard so you can view the resulting BER readings.
- Set up the first to view the Expert Editor, where you'll do the adjustments:
- The easiest thing to do is to make calls lasting a few seconds to a Parrot talkgroup or reflector.
- In the Expert Editor, adjust the RXOffset setting, make a parrot call, and observe the readings. You're aiming for a BER of less than 1%, preferably less the 0.5%.
- Begin with +/-100 offsets, and see how that affects the BER.
- Once you find the lowest BER with the +/-100-step offsets, repeat the process with +/-50-step offsets, and finally +/-10-step offsets until you find the lowest BER.
- Repeat this process in each MMDVMHost Configuration Mode in which you're experiencing high BER, until you achieve the optimal BER in each one. If you can't find a good balance for the BER between the different modes, it may be better to use different hotspots for each different mode.
73, Toshen, KE0FHS
Playing with Pi-Star (unofficial notes about setting up and using Pi-Star):
https://amateurradionotes.com/pi-star.htm
Playing with Pi-Star (unofficial notes about setting up and using Pi-Star):
https://amateurradionotes.com/pi-star.htm
Re: Decrease BER %
admin/expert/edit_mmdvmhost.php
Andrew M1DNS, (Mod)
Andrew M1DNS, (Mod)
Andrew M1DNS.
Pi-star Admin Team.
Pi-star Admin Team.
Re: Decrease BER %
Yes, it does. I have TYT MD380UV at home with nano hotspot MMDVM_HS_hat. It has (as I wrote b4) in max 0,4% BER
in maximum in minimum
73! Anton aka Tony
EL #2102, EL #53698, DMR #2503041, XLX937-B
Clubs: RC5C, RY3AAL, NMDXC
EL #2102, EL #53698, DMR #2503041, XLX937-B
Clubs: RC5C, RY3AAL, NMDXC
Re: Decrease BER %
Newbie here. If my BER% is 0.7, should I just leave it alone? Kinda like if it ain't broke, don't fix it. I've amde a few contacts now on the AmericaNet, and everyone says that I sound good. Just don't want to be a LID.