Modifying Vintage PMR Coils
I am 'considering' modifying a 40+ years old Burndept BE439 UHF PMR handset for 70cm.
Luckily I was given diagrams of the set with notes that suggest an extra turn is required on the first local oscillator. Details enclosed.
This sounds simple but . . .
1. The board has to be removed from the mother board and the through plating for the earth connection has a nasty habit of lifting - but it can be done.
2. I have NO idea what gauge the coil wire is and I may cause more damage in carrying out this process.
I wondered if it would be much easier to simply tag another capacitor across the coil and bring the resonance down that way?
It sounds too easy to me and I suppose there would be some kind of trade off to the Q of the circuit and cause other issues?
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