[Hammarlund] Old Hammarlunds

[rbethman]

Actually, They went from Hammarlund to Northern Radio.  The first order 
was in 1951.

The diversity switching was done as had "eventually" done in the JX 
series.  The Northern has the two extra knobs, just not red.  The upper 
right corner on "some" Northern's is where the dataplate went - but no 
holes.

Another Northern I've seen pictures of Al Parker's work, had the 
dataplate on the left.  Once again, no holes, but the two black knobs 
instead of red.

Bob - N0DGN

On 4/12/2011 6:13 PM, WILLIAM MARX wrote:
> I haven't heard diversity mentioned often when talking about SP-600's.
>
> My Dual Diversity was converted by TMC in 1956.  There is a tag inside with the
> information.
>
> It appears to have been manufactured in 1952 from what I can tell. I guess the
> military shipped them to TMC for conversions.
>
> Bill Marx W2CQ
>
> ----- Original Message ----
> From: rbethman<rbethman at comcast.net>
> To: Hammarlund at mailman.qth.net
> Cc: Glen Zook<gzook at yahoo.com>
> Sent: Tue, April 12, 2011 4:44:16 PM
> Subject: Re: [Hammarlund] Old Hammarlunds
>
> The SP-600 J, not JX came out in 1951 with no crystals.
>
> The first diversity version was done by Northern Radio.  SP 600 J11 is
> what the dataplate has on the turret cover.
>
> They have one heck of selectivity!  One part non-crystal, then the
> remaining is a variable crystal type.
>
> Bob - N0DGN
>
> On 4/12/2011 4:00 PM, Glen Zook wrote:
>> You have to remember that many of the SP-600 receivers used by the military
>> were the JX- versions that could be crystal controlled as well as the tunable
>> feature.  Those JX- versions were usually used with crystal control for things
>> like RTTY circuits.
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
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|               AM Amateur Radio Operator    NØDGN                 |
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