[Boatanchors] Oddball 50 Kcs Homebrew Receiver

[Jim Wiley]

If I am remembering correctly, and if this is the thing I was thinking 
about,  it appeared in several handbooks in the early to mid 60's.   
Yes, it was a dual bandwidth IF strip. In fact before I became smarter, 
I actually started gathering parts for this beast, but soon enough 
"wised up" and determined that it was way too much of a project for a 
beginner.    A version of of this concept (not exactly the same of 
course) was marketed by Hammarlund as a SSB adapter for companion 
receivers.   The concept could be thought of as a HQ-110 followed by the 
SSB adapter.  I don't remember the model number of the SSB adapter, 
perhaps it was the HC-60 or something like that. The packages that had 
everything in one cabinet were the HQ-170 and HQ-180, more or less 
identical except one was ham bands only and the other was general 
coverage. Hammarlund's version used 60 kHz as the low IF, instead of 50 
kHz.   I also seem to remember that it was intended to follow a ARC-5 
type receiver.

- Jim, KL7CC



On 1/25/2016 4:10 PM, Ian Wilson wrote:
> Is this the monster with two parallel (different bandwidth) IF strips?
> Trying to recall
> the name of the QST article.
>
> 73, ian K3IMW
>
> On Mon, Jan 25, 2016 at 4:47 PM, Whitebear1122 <whitebear1122 at comcast.net>
> wrote:
>
>>> I’m trying to ID a very interesting and very strange home-brew
>> receiver..  At first I thought it was a DCS500 because of the 50 Kcs IF
>> but I don’t think so now.  This item is built in a 19” rack panel/chassis,
>> National dial on the front, handful of controls.  It has 12 Miller 1884 50
>> Kc IF transformers on a raised chassis on top of the main chassis.  It also
>> has two Miller 912-W2 oscillator coils for 1400-1600 KC on an elevated
>> chassis connected to the front panel dial so obviously the oscillator.
>>> It looks like some huge 50 Kc IF filter at a minimum.  It appears to be
>> bandswitched though, not using plug in coils, but bandswitched miniature
>> coils.
>>> I found a data sheet from JW Miller for a “High Q 50 KC stagger tuned
>> band pass coils.  It shows a schematic of a big band pass amplifier.  I’m
>> wondering if the OT made a receiver out of it with an RF front end and
>> mixer.
>>> Just wondering if this rings a bell with anyone.   I can send a picture
>> if that would help.
>>> 73, Scott WA9WFA
>>