|Subject:||Re: [TenTec] First DSP IF Corsair II?|
|Date:||Sat, 4 Dec 2004 17:53:15 -0500|
Really NEAT!! Ham radio is alive and well at Duane's QTH. Congrats
on the 'playing'...could be very interesting!|
Tom - W4BQF
----- Original Message ----- From: "Duane Grotophorst" <email@example.com>
Sent: Saturday, December 04, 2004 5:02 PM
Subject: [TenTec] First DSP IF Corsair II?
I don't know if any one else has done this before but I have created a DSP IF Corsair II, well sort of. The experimental lash-up that I'm playing with took all of 15 minutes to setup and get going. All that I did was connect the antenna input of the Flex Radio SDR-1000 through a capacitor/tap to connector #73 of the Xtal Filter Board (81252). This is the RX output side of the 9 MHz 1st IF filter of the Corsair II. This first IF filter then essentially becomes a 2.4 kHz roofing filter for my little experiment, sort of like an Orion :). The SDR-1000 was then tuned to 8.999800 MHz to hear the IF signal coming through the Corsair II I 9 MHz IF filter. Tuning around the bands is accomplished with the Corsair II's VFO, the SDR-1000 is run in USB mode for all bands except 17M which is opposite, this is necessary for the same reason you must use SB-R to operate SSB on that band normally. With the SDR-1000 tuned to 8.999800 MHz the frequency display of the Corsair II is exactly on when the audio pitch of the RX signal is correct in both receivers. Since I'm only tapping the 9Mhz signal off of the RX path of the Corsair II I can actually listen to both the Corsair II and SDR-1000 simultaneously; so making performance comparisons is easy.
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