Re: [Flexradio] SDR-1000 RF Gain Question
NZ8J wrote: I downloaded Power SDR 1.6.2 a few .wav files and have been playing around with it for a few days. I have the D44 sound card installed and am really impressed with what I'm hearing from the wav files. I do have a couple questions however that I hope someone could answer. I'm assuming that since I am listening to the .wav files instead of signals off the air, things like the AGC and Preamp are not operational when listening to wav files? The AGC is operational, preamp setting is not. reason I'm asking is I like to work CW on the low bands and with the band noise usually encountered there I normally reduce the RF gain and/or use the attenuator to help reduce the band noise. Will changing the preamp setting accomplish the same thing? If not, is there any way to reduce the band noise as you can using an RF gain control on other radios? Download and use 1.6.3 SVN from the svn server. RF gain is now on the front panel rather than an internal setting. Eric and I had no idea how often people use that control. Thanks in advance for any information 73 Tim NZ8J Bob N4HY -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat. - Einstein ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] sdr and rf
Mike, I use the SDR with the Delta 44 Beringer 602mixerto drive a Henry 4K Ultra on 20 meters with no RF problem. However, the first time I tried it on 40 meters I had a problem. I solved the problem by disconnecting the other rigs from the mixer (I had a FT-1000D FT-847 hooked to the mixer). Turns outRF was getting into the mixer from the FT-1000D. I must have had about 50 lbs of ferrite chokes on all the SDR lines. Today I have none. Try disconnecting everything from the Beringer 802 except for the mic inputand line to the Delta 44 breakout box. Also,keep the audiolines short and watch out for resonant lengths on the audio lines. Good luck. 73, Bob K8MLM In a message dated 8/14/2005 11:20:45 P.M. Eastern Standard Time, [EMAIL PROTECTED] writes: Fellow sdrmen,Several of us are struggling with what seems to be a common problem. All using the 100w sdr with the Delta 44 and breakout box.The ssb audio is distorted seemingly by rf getting into the sound card and/or radio.I have tried many and varied ferrites, various forms of grounding, etc. Tonight, I connected to a dummy load, and monitored the audio on a separate rx - an 775dsp set to 3.6 Khz bandwidth.Speaking into the mic, as I turn the power meter from 1 to 100w, I can hear the rf in my particular set up begin to distort the audio at approx. the 20 w level. Under that, the audio is presentable. Above 20w, the rf begins to show up and distort the audio. I am using an EV RE27 mic and the Beringer 802 mixer to feed directly into the Delta 44.Several of us are working to find the route and method the rf is getting into the audio. Seems to be a common problem. If someone has found the secret, I would certainly like to compare notes.Thanks for any suggestions or assist. 73, Mike K5NU
