[Hammarlund] Hammarlund radios

[Richard Knoppow]

----- Original Message ----- 
From: "Lloyd Godsey" <kk7iz at cox.net>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, December 13, 2011 11:03 AM
Subject: [Hammarlund] Hammarlund radios


> Here is what's in my shop:
> Polished face  no tag BC-794
>
> Pair of R-270/FRR 1250 kc ->  40 mc receivers one is 
> tagged BC-779, other
> BC-794
>    was going to put together an R-270/FRR diversity unit 
> but no time.
>
> SP-400X Was told the fancy knobs were special order. ????
>
> Have power supplies for all
> All are available for right price.
> see at
> http://img.photobucket.com/albums/v618/skyrider28/IMG_7924.jpg
> http://img.photobucket.com/albums/v618/skyrider28/IMG_7925.jpg
> http://img.photobucket.com/albums/v618/skyrider28/IMG_7930.jpg
>
> Thanx
> Lloyd Godsey KK7IZ
> kk7iz at cox.net
> 480-620-7145
> http://www.lloydsdipsydumpster.com/
> http://antiqueradioarchives.com/
> Skype: lloyd.godsey
>
      Hammarlund made three versions of the SP-200 series 
for the military:
BC-779 traded the two lowest frequency bands (540 to 1250khz 
and 1250 to 2.5khz) for 100 to 200 khz and 200 to 400khz for 
aviation use, and had continuous coverage from 2.5mhz to 
20mhz.
BC-794 was the standard version with continuous coverage 
from 540khz to 20mhz
BC-2004 was the extended range version with continuous 
coverage from 540khz to 40mhz. This receiver also had 
shunt-fed RF stages instead of the series fed ones in the 
other receivers to improve the selectivity of the RF in 
order to reduce image response on the higher bands. Other 
circuitry is identical among the three.
     Two versions at least of the power supply were 
available, a rack mount standard version and another for 
mains supplies down to 25hz. The latter is very heavy 
because it has a larger transformer and chokes in it.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com