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jury rigged vhf receiver
JIMMIE wrote:
I was wanting to listen to VHF/UHF SSB. All of my present UHF/VHF radios are FM. I was thinking of rigging up a simple downconverter using a mini circuit mixer and my HP signal generator as the local oscilator that I can connect in front of my HF rig. I have an antenna mounted pre- amp that I think should suffice for my front end. Any foreseeable problems short of keying my transmitter while it is connected. Jimmie For best performance these mixers require a constant impedance at all three ports (usually 50 ohms). The preamp will provide this for the RF input and the output of your HP signal generator should have a 50 ohm selectable output. You may need to add an attenuator between the generator and the mixer if the HP does not provide a 50 ohm termination using a variable output. You will need to set the oscillator injection level to the mixers required 7dbm drive level for best conversion "gain". The output should go through a bandpass filter covering the IF frequency you are down converting to and provide a 50 ohm impedance. A duplexer network here is a good idea (provides a 50 ohm termination at the IF frequency and a low impedance (short) to ground to out of IF signals). |
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