yep yep yep. I have several of those little solid state audio amps. $ 5 and half a dozen caps and resistors near dc to channel 6 and unmeasurable distortion, whats not to like there?? does not get any better than those rascals. I always wonder if anyone is using several of the bigger ones in bridge as a modulator. well I know there is a TRICK to getting WINRAD to run. Do you intend to tell me and the others sometime in the near future?? or just let me continue to squawk? rx sounds good, I sort of figured it was a minimalist rx for RF and IF. every circuit, every resistor and connection one puts in there adds junk to the signal.
---- Original Message ----- From: "Brett Gazdzinski" <[email protected]> To: "Discussion of AM Radio in the Amateur Service" <[email protected]> Sent: Sunday, March 28, 2010 12:40 PM Subject: Re: [AMRadio] sdr-iq > There is a trick to getting winrad to run, but its worth it for the audio, > and changing the filters don't cause that racket, plus it does ecss which > is > real nice. > > Also, how you listen to the audio likely counts, with spectravue, audio > output is low and noisy, with winrad or sdr console its much louder and > cleaner. > With headphones off the laptop, it sounds fine, my laptop does not have a > line out, only headphone output for feeding into the Marantz amplifier, > and > does not sound that great that way. > > The sdr-iq is not great for operational use, since it has a lot of delay > in > the computer, no muting, etc. > It does make a good swl and listen only receiver for the price and size, > and > is great for spectrum analysis of signals, even your own TX signal. > > Remember, the sdr-iq is the cheapest sdr you can buy that covers 100Hz to > 30 > MHz, they could have made it a LOT better for more money. The sdr-ip is > better, and costs $3000.00 to start.... > > > The homebrew RX is a simple single conversion, 455 KHz IF no RF amp, for > 160, 80 and 40 meters. > No active stages before the mixer, just very high Q tuned circuits, the > filters (Kiwa) is right after the mixer, some IF amp stages, a low > distortion AM detector, agc, s meter, digital freq readout. > All the tubes run off 150 volts, the LO runs off 100 volts. > Its stable, accurate, quiet, has no birdies, image problems, and has very > good fidelity. > > There are a lot of simple receivers that could be made much better, add a > digital readout, and a kiwa filter board with say 6 and 8 Kc filters, and > maybe re do the detector and agc, and you would have a very good AM > receiver. > > I always wanted to try changing a 75s1 to hifi AM by adding a good filter > and a good low distortion AM detector. It would be stable, accurate, with > good AM filters, small and light, and nice looking, and still copy ssb and > cw well. > I suppose it could sound and work just as good as an R390a, sp600, and > other > massive receivers, if you feed the detectors into a nice audio amplifier, > or > build a nice hifi audio output stage, maybe using one of those 8 watt 5 > pin > audio output IC chips. > > Brett > N2DTS > > > > > > > > > > > > > ----- Original Message ----- > From: "Bernie Doran" <[email protected]> > To: "Brett Gazdzinski" <[email protected]>; "Discussion of AM > Radio in the Amateur Service" <[email protected]> > Sent: Sunday, March 28, 2010 7:39 AM > Subject: Re: [AMRadio] sdr-iq > > >> HI Brett: yep I have tried every setting that I can change. I have never >> been able to get WINRAD to run and I do have the rf-space downloads to >> run >> it. downloaded everything several times from different sources. as I >> said, the sdr filters work great, there is an anoying pop when you slide >> the width around. It is to the point that I have spent hours and hours >> fooling with it and have seen no improvement since the first 2 hours. >> sounds "OK" on SSB and its amusing to look at the splatting, residual >> carriers and poorly suppressed upper sidebands on 80, most are good but >> some really do not look good. its best use is for a bandscope, test >> equipment, or portable use, as you said. Interested in your home brew rx >> tell us what you have. >> the 390 will fed its IF to a sync det and outboard audio stage at least >> as >> a test. >> ----- Original Message ----- >> >>>> well I am going to stir the pot again with my probable final comments >>>> on >>>> my >>>> SDR-IQ. first the good, never had a panadapter or bandscope, it works >>>> great >>>> for that. The filters are very good. The issues to me are the >>>> following, >>>> it >>>> is noisy, to itself and also to a receiver on the same antenna, it >>>> lacks >>>> sensitivity, it has spurs, and the big one to me is the audio quality, >>>> a >>>> moderate strength AM signal is difficult to understand and when on my >>>> hollow >>>> state stuff it is nearly %100 copy. The present computer is a 2.2gig >>>> quad >>>> core, no performance change above a single core 1.8 gig. Numerous >>>> different audio systems confirm that it is the nature of the beast. >>>> >>>> I have read numerous articles on D-A and A-D processing and believe >>>> that >>>> 14 >>>> bit is not going to do the job that I want. I suspect 24 bit and a >>>> much >>>> higher sampling rate, 150 meg? would just about cure the audio issue >>>> for >>>> me. I am starting to believe that the glowing reports written about >>>> SDR >>>> are >>>> prepared by those that have never used an old VT receiver or have one >>>> available to run beside the sdr. My FT1000 Mark V had glowing reports >>>> and >>>> I >>>> am really disappointed with it. I have an ever deepening respect for >>>> those >>>> that designed and built the old classic receivers. Looking at noise >>>> figures >>>> and sensitivity on those old dogs places them very close to theoretical >>>> limits, pretty amazing. I have put my money where my mouth, I should, >>>> about >>>> April 10 or so have a completely reman R-390A. I was going to try the >>>> Flex >>>> 5000, but as I posted earlier they did not see fit to respond to my >>>> questions, perhaps thinking the questions were not fit to respond too. >>>> >>>> Earth hour is today, be sure to turn on all of your lights to help save >>>> the >>>> grid and generators. ! Bernie W8RPW >>>> >>>> >>>> ______________________________________________________________ >>>> Our Main Website: http://www.amfone.net >>>> AMRadio mailing list >>>> Searchable Archives: >>>> http://www.mail-archive.com/[email protected]/ >>>> List Rules (must read!): http://w5ami.net/amradiofaq.html >>>> List Home: http://mailman.qth.net/mailman/listinfo/amradio >>>> Post: [email protected] >>>> To unsubscribe, send an email to [email protected] with >>>> the word unsubscribe in the message body. >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>> >>> ______________________________________________________________ >>> Our Main Website: http://www.amfone.net >>> AMRadio mailing list >>> Searchable Archives: >>> http://www.mail-archive.com/[email protected]/ >>> List Rules (must read!): http://w5ami.net/amradiofaq.html >>> List Home: http://mailman.qth.net/mailman/listinfo/amradio >>> Post: [email protected] >>> To unsubscribe, send an email to [email protected] with >>> the word unsubscribe in the message body. >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> >> >> >> > > ______________________________________________________________ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/[email protected]/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Post: [email protected] > To unsubscribe, send an email to [email protected] with > the word unsubscribe in the message body. > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. 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