07-09-2012, 03:39 PM
(07-09-2012, 12:35 PM)Skywave Wrote: Lawrence: haven't heard much for you lately about this project: what's the latest news, please?
Al. / Sept. 07, 2012 //
Wel.....It's like this.....I'm on concrete duty, big time.... Yesterday and today I have mixed and laid approx 5 tons of stuff, I have about another 6 tons to do but have run out of three quarter to dust until Monday, we can only get a 7 ton gross lorry up the track, the waggon carries about 4 1/2 tons max so will need another delivery after the one on Monday, I am doing the floor in the new log shed/car garage plus a concrete raft for my Landrover garage to be and also the footings and floor for our proposed extension which will be the radio room! The Regenerodyne still lives, I have not fired it up for about three weeks as I have an R1155 on the bench at the moment and pondering wether or not to do a refurb or leave it 'till I have less house DIY to do, I am tempted to leave the R1155 until I have more time as I don't want to rush the refurb.
The Regenerodyne as last developed is now running a lashup on chassis VFO, this works fine, the plan is to use that and also have it switchable as a straight amp for an RF Sig Gen input. I have not done anything since on the harmonic generator idea though I am not discounting the idea completely, neither have I as regard to using switched Xtals for the dedicated amature bands. As you know the HG idea does work but the mixer drive output is low compared to a purpose built VFO, I thought the VFO I rigged up might drift to much but it seems fine as far as valve VFO's go, I checked it at 10 Mhz on WWV and it was no worse than say a Hallicrafters, HRO etc, obviousely it needs refining it's a tuned anode job with grid feedback winding. When the time comes I might have a go with a Colpitts, that will reduce the VFO tuning per range but for amature SSB reception it does not really matter as the band ranges are fairly narrow anyway.
Whichever way, with various combinations of osc/mixer drive I still intend for it to cover from the bottom end of Top Band up to and including 10 meters. Probably go for homebrew plug in coils a la HRO, Eddy 358x etc, audio output will be included but PSU and speaker will be seperate for stability reasons (heat/vibration etc)
So there we go....What's your latest project Al?
Lawrence.
