Hi Michael, SNR sounds similar to what I get from my IC7200. I think yr close.
Only issue with using the data connector is levels. The SM1000 output is attenuated quite a lot down to typical mic levels (see SM1000 page for specs). So maybe check the levels are compatible. Cheers, David On 01/08/15 08:09, Michael Carey wrote: > Thanks for the info David, > > I'm hoping to find others who are using the SM1000 and FreeDV with the > Icom IC-7100 radio and compare what we've done. > > I am flying a bit blind with setting the power levels. I'm presuming > that both the radio power output meter and my external wattmeter don't > "like" the FDMDV modulation to give a true power output indication. I > set the radio power output at 25% (once again presuming that 100% is > 100W! :-) ), I increase drive so that ALC just indicates and I get > around 3-5 W showing on the power output meter... but it's not steady, > jumping around all over the place. > > I'm modulating via the ACC connector on the back of the transceiver, the > IC-7100 has Data mode which when selected allows you to take audio from > different places... in my case the ACC connector. This also turns off > compression and other trickery that might mess with a data transmission. > > I'm using a Kenwood TS-50, SignaLink (non USB version) and a Cmedia > sound card in my shack PC to decode the IC-7100. > > I get 0 BER, SNR of 17, but the spectrum display looks a little lumpy. > I can fiddle with the output of the SM1000 over a fair range with very > little change in the displayed signal and received audio. The scatter > diagram also doesn't look as nice as I've seen others. The dots are > most certainly grouped together, but not as tight as I would have liked. > > I'm hoping to get more time in the shack this weekend to experiment a > bit more. > > 73 > > Michael. > VK5ZEA > > On 26/07/2015 7:19 AM, David Rowe wrote: >> Hi Michael, >> >> FB on getting your SM1000 up on the air - lets have a QSO some time! >> >> Adjusting so your ALC just moves, and 20-25 watts average power for a >> 100W PEP rig is a useful rule of thumb for FreeDV 1600. The classic >> "rookie mistake" is overdriving the SSB tx, which causes clipping and a >> poor bit error rate at the receiver. Make sure any speech compression >> is off too. >> >> The best way to adjust your tx drive is monitor the SNR of the signal >> using a 2nd rx and the FreeDV GUI program. For example when I tx with >> my IC7200, I have a FT817 nearby with no antenna and the RF gain wound >> down. I feed the rx audio into my laptop and monitor the scatter >> diagram and SNR. Incidentally, with my IC7200 I can't seem to get >> better than 20dB, perhaps due to it's sharp tx filtering. >> >> I have a video that demonstrates this (and explains scatter plots): >> >> http://www.rowetel.com/blog/?p=3109 >> >> Cheers, >> >> David >> >> On 25/07/15 23:05, Michael Carey wrote: >>> Hi Everybody, >>> >>> I've been building up a set of SM1000 cables for a few of my different >>> HF radios. The main radio I use at home is an Icom IC-7100. >>> I understand you set the input level to the radio so the AGC indication >>> barely moves and make sure you don't stress the output stage too much... >>> I've settled on around 30W output. >>> >>> I find that the AGC indication on my IC-7100 tends to jump around a >>> little when transmitting the FDMDV signal. >>> Can I use the test tone to set the transmit level and be confident that >>> this is OK for FDMDV? >>> >>> 73 >>> >>> Michael. >>> VK5ZEA >>> >>> ------------------------------------------------------------------------------ >>> _______________________________________________ >>> Freetel-codec2 mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >>> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Freetel-codec2 mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
