Several of my friends are into restoring and driving historic military vehicles. They often outfit their vehicles with period radio gear, commonly using wideband FM in the 30-70 mHz range.
I thought they'd appreciate a way to receive broadcast band FM radio in their trucks without having to drag along a (non-authentic) boombox.
I'd like to build a downconverter to translate FM-BCB to the mil frequecy range. The small, battery operated circuit would contain an 88-108 mHz filter/RF pre-amp, 50 mHz oscillator, mixer circuit, and 30-60 mHz output filter/amp. Inserted in the receive antenna line, all the operator would have to do is subtract "50" from the desired FM BCB radio frequency and set his military radio to that. OK, it's not stereo or even high fi, but it's better than listening to the tarp flap while winging down the road in your M715 truck!
I'm a digital guy, and I am hoping some RF guru could come up with a quick schematic with LC values. I figured I'd make a few for some friends, but, who knows, there may be a market out there?
Thanks,
Rusty
I thought they'd appreciate a way to receive broadcast band FM radio in their trucks without having to drag along a (non-authentic) boombox.
I'd like to build a downconverter to translate FM-BCB to the mil frequecy range. The small, battery operated circuit would contain an 88-108 mHz filter/RF pre-amp, 50 mHz oscillator, mixer circuit, and 30-60 mHz output filter/amp. Inserted in the receive antenna line, all the operator would have to do is subtract "50" from the desired FM BCB radio frequency and set his military radio to that. OK, it's not stereo or even high fi, but it's better than listening to the tarp flap while winging down the road in your M715 truck!
I'm a digital guy, and I am hoping some RF guru could come up with a quick schematic with LC values. I figured I'd make a few for some friends, but, who knows, there may be a market out there?
Thanks,
Rusty