[Drake] Re: SW-4A Accessory Socket (Garey Barrell)

[telegrapher at att.net]

Of which i think RME was most noteable.  In the event you need one of these, i have either one or two of them at my disposal, can't remember how many boxes there are any more.

Larry
W0OGH


-------------- Original message from Garey Barrell : -------------- 

> Ron - 
> 
> Jim was mistaken about the audio amp part. The connections are B+, 
> Fil, Ant and Ground. These connections are the same on all of the 2 and 
> 4 Series receivers. 
> 
> There were Preselectors, and in fact they are still being offered by 
> several manufacturers. Essentially a preamplifier combined with a 
> tunable, relatively narrow filter. They were originally added to older, 
> single conversion receivers to give a little more (hopefully low noise) 
> gain on the higher bands, and additional front end selectivity to combat 
> images. Kind of like the front end of a Drake receiver! :-) 
> 
> Preamps were also fairly popular, since many older receivers rapidly ran 
> out of sensitivity on 15 and 10M. 
> 
> The 2A/2B used this connector for the 2-LF Low Frequency Converter, but 
> was normally used for the accessory 100 kHz calibrator. The 4-LF was 
> for the 4 Series receivers. 
> 
> The same connections were also usable for VHF/UHF converters. 
> 
> Back in the "Old Days", similar external power connectors were used for 
> 100 kHz calibrators, electronic T-R switches, preselectors, preamps, 
> converters, etc., etc. 
> 
> 73, Garey - K4OAH 
> Atlanta 
> 
> 
> Ron Wagner wrote: 
> 
> > Jim, Gary, 
> > Were not things call pre-selectors popular around the time of the 
> > SW-4A? The things that were an antenna preamp and tuner kind of 
> > thing. Sounds like the exact fit to run a tube voltage wise, and the 
> > antenna input would be for the output of the preamp/tuner. Not sure 
> > what the audio input would be for though. 
> > 
> >> 
> >>> It didn't need it, since it goes down to 200kc out of the box. BTW, the 
> >>> socket taps the 120vdc, 6.3vac lines and the antenna input and input 
> >>> to the 
> >>> audio amp. 
> >>> Jim 
> >>> WA8SDF 
> >> 
> > 
> > 73, 
> > Ron 
> > 
> > ============================================================ 
> > Amateur Radio Station: WD8SBB - Ron and KB8NRP - Joann 
> > ============================================================ 
> > 
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