20-04-2012, 03:52 PM
Thanks for your input Al and the time to do your block diagram, I have noted the frequency multiplier idea and the DBM's, I did a bit with DBM's years ago when messing around with direct conversion receivers using the old SBL1 device.
I agree, working out the osc freq. with respect to potential strong image transmissions would be the key to most of this, obviously there is a trade off and a limit with such relatively simple designs and fully realize the limitations. However I would like to stick to the 500 khz tuning if poss as when coupled to a suitable reduction drive the tuning should feel about right, having said that if I chose to go the 1 mhz route I can always add a low value vairiable capacitor across the main gang for fine tuning.
Lawrence.
I agree, working out the osc freq. with respect to potential strong image transmissions would be the key to most of this, obviously there is a trade off and a limit with such relatively simple designs and fully realize the limitations. However I would like to stick to the 500 khz tuning if poss as when coupled to a suitable reduction drive the tuning should feel about right, having said that if I chose to go the 1 mhz route I can always add a low value vairiable capacitor across the main gang for fine tuning.
Lawrence.
