DSB 40 : Other bands
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Steve Smith
Nov 19, 2012, 10:11:35 PM11/19/12
to Minimalist_QR...@yahoogroups.com, homebrew-du...@googlegroups.com
I refer to this rig DSB 40 but there is no reason it can't be built for other bands. Most of the circuits are broadband so only the crystal, maybe the feedback capacitors in the oscillator and the LPF components would need to be changed. I probably missed something but you get my drift.
IMO, this rig would be a kick on 20. That probably is about as "fast" as the BD139 transistors will go and still make usable power but I think that the driver and final transistors out of a CB rig would allow it to make reasonable QRP power up at 28 MHz and maybe higher!
6 meters would be a real hoot but for U.S. hams the spectral purity requirements are much more stringent than they are for the HF bands so that might be an issue. Not impossible but more difficult.
If I were going to 6 I'd probably lift some transistors out of an old 30 - 50 MHz FM land mobile rig, bias them for linear amplification and go. Up that high, the receiver would probably also need some help in the form of a RX pre-amp.
73.......Steve Smith WB6TNL
IMO, this rig would be a kick on 20. That probably is about as "fast" as the BD139 transistors will go and still make usable power but I think that the driver and final transistors out of a CB rig would allow it to make reasonable QRP power up at 28 MHz and maybe higher!
6 meters would be a real hoot but for U.S. hams the spectral purity requirements are much more stringent than they are for the HF bands so that might be an issue. Not impossible but more difficult.
If I were going to 6 I'd probably lift some transistors out of an old 30 - 50 MHz FM land mobile rig, bias them for linear amplification and go. Up that high, the receiver would probably also need some help in the form of a RX pre-amp.
73.......Steve Smith WB6TNL
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