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LPE 200 Synthesizer Unlocked

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kd7kdc

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#1
I have tried to program the LPE200 to the 902-927 amateur band
and the radio is saying the sythesizer is not able to lock.
Anyone have any ideas to remedy this??
 
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I investigated something along similar lines recently. I found the VCO was a limiting factor, only able to pull +/- 8 MHz from its designated bands. Since the VCO is a sealed surface mount device, it'll be very hard to modify. By all means, if you want to give it a go, let us know how you go about it.

This thread has a little more information, but its more about out of band RX only, where as you want to figure out TX side of things too: http://forums.radioreference.com/harris-ma-com-ge-ericsson-forum/195661-lpe200-out-band-rx.html

I think the TX side of things shouldn't be too hard, the RX front end would need some new ceramic bandpass filters though I would think - the existing ones are fixed & not adjustable. You might be able to modify the existing filters by adding in a little bit of ferrite in a weak glue solution (to go down in freq) or a little bit of brass (to go up in freq), I've done that to other such radios in the 450 MHz range before, but never tried it on a 900 MHz type.
 
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