Hi Jim, I use my SDR-1000 (with PA) on digi modes and CW just as you do. Here is my setup.
I discovered that buffers are all critically important when trying to get the shortest T/R time (and consequently the smallest disturbance on the waterfall. You didn't mention your audio system, but I will assume it is the Delta-44. Set your hardware DMA buffers to 128 or 64 if you can. Set your PowerSDR AUDIO and DSP buffers to 512 or lower if you can get away with it. If you are using ASIO4ALL and some other sound system, turn the double buffering off. As for AGC, I keep it as l-o-n-g as possible so that it will glide through the T/R transition. I quickly learned that in order to copy Digital SSTV I had to set my PowerSDR console VAC sample rate to 48000, but my actual VAC speeds are all 11025=low and 48000=high with BPS low=8 and high=24. The Stream Format Limit is Cable Format. I haven't tried to transmit yet. I am still very confused about all the SSTV acronyms and jargon. It all works like magic with Phil N8VB vCOM 2.26 and CAT from MixW. I am very pleased with the setup and totally amazed how far the PowerSDR and associated third party code has come in such a short time. GL and keep your info flowing along, see you on MFSK, Olivia, or PSK31/63 ;-) 72/73 de ken n9vv Jim Dunstan wrote: > Hi, > > I have my SDR-1000 (1W version) working on all HF bands on RTTY and PSK (my > favourite modes) using Virtual Comports, Virtual Audio Cables, and Mix-W > with complete reliability. This setup in turn drives an all-band tube > linear amplifier with (15-20 milliwatts) which in turn delivers a cool > 20-50 watts of power to my antenna. I am using a small intermediate PC > type relay in the SDR-1000 to key the clunkier relays in the linear (I > intend to replace these one of these days) and all relays are paralleled > with appropriate diodes to prevent voltage 'clicks'. I don't mind the > audible clunks .... after all I know they are working hi. But I notice > that on the waterfall tuner on MixW that when the transmission drops off > and receive comes on there is a visible 'click' on the waterfall. There is > no problem with the waterfall or system stablility ... just a 'click' . > > Any suggestions on where to look and what solutions may be possible to > 'soften' the 'click' on the 'waterfall' during transition from transmit to > receive. It almost sounds/looks like an RF click .... now I feed the > system into an excellent antenna with little or no SWR which is up on a > tower well away from the operating position. The amplifier is well > shielded and is completely stable and i am using the time delay built into > the X2 external switch. It is like the relays themselves are causing the > click. > > I would expect the waterfall to stop when the system goes to transmit and > start again when it goes to receive and there would be a nice clean break > at both ends without that little 'flash' on the screen when it comes back > on. It seems to me that the SDR, Linear, Software, Computer, and > interconnections are involved in the switching process. > > Oh well .... maybe i am just a perfectionist .... to me Ham Radio should be > split 50/50 between the operating position and the work bench hi. > > Any suggestions on where to look would be welcome. > > Jim, VE3CI > > > > > > _______________________________________________ > 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/ > > FlexRadio Knowledge Base: http://kb.flex-radio.com/ > > _______________________________________________ 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/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
