[Hammarlund] Ronald McDonald's SP-600

[Richard Knoppow]

      Your picture came through.  BTW, there is a handbook for the NR 
set on BAMA.  Hammarlund made a nearly identical set as the JX-17. Set 
up to run from an external IFO. Handbook for that also available at 
BAMA. One list says the JX-17 was made in greater quantities than any 
other. This is the one with red knobs. I have one. A later mod installed 
a pot for gain trimming in place of the dial lock. This is a necessity 
for diversity.

On 3/7/2026 7:11 AM, D LAST_NAME_SHORT: T wrote:
> Forgot this list doesn't take photos...for those interested, any suggestions where to upload my attachment?
> k0dan
> 
>> On 03/07/2026 9:05 AM CST D LAST_NAME_SHORT: T via Hammarlund <hammarlund at mailman.qth.net> wrote:
>>
>>   
>> I believe Northern Electric modified stock SP600's under govt contract (Cold War) for the Navy? The mod was specifically for diversity RTTY reception.
>>
>> I've had the model in the photo for a decade or more...it is a gem and pleasure to use. Of course I'm using it as a straightforward general purpose receiver (500 kHz thru 56 mHz). No product detector but it copies sideband fine using RF gain and volume controls.
>>
>> I am thinning out my boatanchor collection, and this receiver is available for those who wish to add it to theirs.
>>
>> 73,
>> Dan
>> K0DAN
>> Kansas City
>>
>>> On 03/06/2026 9:41 PM CST Jacques Fortin <jacques.f at videotron.ca> wrote:
>>>
>>>   
>>> Northern Electric ?
>>> OMG, why ?
>>> I worked for the company when it became Nortel.
>>> You do not want to know what happened with...
>>>
>>> 73, Jacques, VE2JFE in Montreal
>>>
>>> Perhaps Northern Electric. The built SP600 fro diversity use. The JX-17 version of the SP-600 was very similar. AFAIK these were painted in standard SP-600 colors.  It's possible fairly large lots of receivers might have been finished in custom colors for some customers.Sent from my GalaxyRichard KnoppowLos angelesWB6KBL
>>>
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-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998