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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!weretis.net!feeder8.news.weretis.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: liz@poppyrecords.invalid.invalid (Liz Tuddenham) Newsgroups: sci.electronics.design Subject: Re: Valve frequency multipliers Date: Sat, 1 Feb 2025 15:30:40 +0000 Organization: Poppy Records Lines: 32 Message-ID: <1r73049.n6vab21clqsl6N%liz@poppyrecords.invalid.invalid> References: <1r71194.rtliy6v9cf4N%liz@poppyrecords.invalid.invalid> <619spjhdpharvtkl5jgrl01ksup7v2fc9m@4ax.com> X-Trace: individual.net 13XFrDD3/lCZaA6Dze6IcAC81HSufALh4pQHvviR8WK8uxxZ/M X-Orig-Path: liz Cancel-Lock: sha1:8GxTo24qUby8NMAdYdTbQl670w4= sha256:cc+dd8MyCHuaHRivRkDUR8bWHPAfOwk+8wBjOpmD2qg= User-Agent: MacSOUP/2.4.6 Bytes: 1928 legg wrote: [...] > > I'd be more selective of the crystal frequency. Two triplers might get > you there with a lot less grief. I regret to say I think you are right :-( Quintuplers just don't seem to work in those circuits so I have placed an order for a 16.656 Mc/s crystal, which will triple-triple to 149.904 Mc/s. That will mean bringing the VFO down to a range of 3.904 to 5.904 Mc/s, which should be relatively easy. Revised block diagram at: http://www.poppyrecords.co.uk/other/Transceiver/BlockDiag6a.gif It will make image rejection in the second receiving mixer a little more difficult The transmitting mixer is intended to be balanced, so rejecting 149.904 Mc/s instead of 150.000 Mc/s from the output will not be any more difficult but I may require an extra tuned circuit in the later part of the transmitting chain to reduce the level of image frequency. I just hope the new crystal will work in the same circuit as the old one and I won't have all the hassle of redesigning it. -- ~ Liz Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk