Interesting, I'll have to get my head around triplex contesting! However, having two separate transceive and keying 'channels' within the Flex-5000 would accomplish the same thing, I think, a bit more elegantly. If Receiver 2 could be routed to ANT1, ANT2 or ANT3 as well as RX1 and RX2 this would seem to be possible. In other words, for example, assign 20M to RX1-ANT1 and 15M to RX2-ANT2 and bounce the TX and PA keying between ANT1 and ANT2 as necessary. This scenario assumes the second RX option installed.
I can't imagine SO2R or multiop contesting without quality external BPFs between the rig and the PA (and stub filters after the PA). It always helps to knock down the TX harmonics, for example, if you're trying to listen to a weak station on 28010 while you're simultaneously transmitting on say 14004. BPFs can help with broadband transmitted phase noise as well, some modern ham rigs have really dirty transmitters (not sure about Flex-Radio). 73, Bill NT1Y Message: 19 Date: Wed, 25 Apr 2007 07:10:53 -0700 (PDT) From: Lee A Crocker <[EMAIL PROTECTED]> Subject: Re: [Flexradio] Does the Flex-5000 have "SO2R in a box" capability? To: Flexradio <[email protected]> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=ascii your problem is you are lost in the land of half duplex transceivers. The flex radio is a full duplex radio. With the added receiver you have three independent processes going on all the time. In fact with the extra receiver you could receive on 20, receive on 15 and transmit on 40 simultaneously. No switching. On 20 you could transmit and receive simultaneously or on 15 you could receive and transmit simultaneously. First in my experience there is no need for bandpass filters. I use my 2 SDR-1000's at 1500W on 2 bands every day The antenna are 100ft or less apart and I have no desense on the non transmitting band. Using a DSP based radio, as long as the AD/DA channel doesn't overload the filters are 100% effective. Second you need 2 complete signal paths from antenna through amp to the radio. If you want a 20 and 15 setup from the back of the radio you need a 20M amp connected to ant 1 and a 15M amp connected to ant 2 and the amps connected to their respective antenna and key lines. Then it is merely a matter of listening on 2 bands and aiming your transmitter to what ever band you want to transmit on, just the same as any SO2R. The audio duties can be handled in software with as many right ear, left ear, both ear, side tone, combinations as you want. Side tone is just another digital process to be route. PowerSDR already has the algorithm for panning 2 receive channels across the stereo spectrum. Given the switching times you could transmit alternate words on alternate bands at 1500W all the time while listening to both bands. If you need to use the same antenna for transmit and receive a PIN switch will solve that. I use PIN switches at 1500W all the time. Full duplex with three running processes and software control of routing the audio as a digital entity, and control signals generated in software is the key and it is why the flex is such an innovation. 73 W9OY _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
