Sounds like you have it about right Michael! On 01/08/15 11:36, Michael Carey wrote: > Hi David, > > I get virtually the same results with the microphone connector as I do > with the ACC connector. Other things like TBW (transmit bandwidth) are > disabled with you enable the Data mode but I'm sure there is still > processing/DSP in the audio path... the IC-7100 is that kind of radio. > > It appears to be working pretty good, but I'm just not confident on the > output power. The only thing that seems to be consistent and may be > what I follow... is the PA current indication. > It doesn't jump around all over the place and shows a nice steady 5-6A > which would be about right for 20-25W RF output. > > I've tried a different RX radio (TS-140S) just to see if that would make > a difference... but no. > > Michael. > VK5ZEA > > On 1/08/2015 8:19 AM, David Rowe wrote: >> 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 >> > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >
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