[Premium-Rx] Rockwell HF-2050

[Clemens Ostergaard]

I think the confusion among some may arise from the fact that the
front panel of the HF-2050 is marked as if ISB can be selected.

This was probably because it was a common panel for three variants of
the receiver: R-5099/U, R-5099A/U and R-5104/GRC-508. Only the
R-5099A/U was to be supplied with an IF/Audio3 board that gave ISB
capability (646-6196-001) The other two had no ISB, their card being
numbered 646-6196-002.

Charles may be right (or the engineer he is quoting) that none of the
ISB were made. As Walt says, however, a few were made with the
preselector port (also a feature of the 5099A) and I seem to have one
of them. I got it from Walt, of course, to whom I would defer in any
discussion of this very pleasing receiver.

Did the R-5104, with supposedly beige-coloured front panel, ever
materialise, I wonder?

Best,

Clemens S.Ostergaard
Aarhus, Denmark

On Tue, Aug 16, 2011 at 7:32 AM, Walter Salmaniw <canswl at gmail.com> wrote:
> I've owned at least 8 2050s over the years, and have seen many times that
> number.  Never have seen any with ISB, and a few rare ones with the
> Preselector board installed.  Most don't.  Most have only 30 memories, while
> a few late models have 100......Walt Salmaniw, Victoria, BC
>
> On Tue, Aug 16, 2011 at 4:36 AM, Charles P. Steinmetz <
> charles_steinmetz at lavabit.com> wrote:
>
>> Terry wrote:
>>
>> >I just acquired a beautiful Rockwell Collins  HF-2050 (serial #E4-is
>> >this right?)
>>
>> To my knowledge, HF-2050 serial numbers are all in the form yy-xxxx,
>> where "yy" is the last two digits of the year of production, such as
>> 86, and "xxxx" is a four-digit serial number in that year's production.
>>
>> >what do I have to do to get my headphones to work and cut out the speaker?
>>
>> The 2050 does not have internal switching on the headphone jack.  You
>> need to do that externally.
>>
>> >Also not sure if I have ISB.
>>
>> I was told by an engineer who worked on the project that there are no
>> 2050s with ISB, because the contract was cancelled before any ISB
>> units were produced.  I have also heard claims from owners who
>> believe their radios have ISB, but so far nobody has been able to
>> show me one that has the ISB circuitry.  (I have, however, seen units
>> that had been kludged by owners or former owners to supply Channel A
>> audio to both the Channel A and Channel B audio amplifiers in ISB
>> mode.)  So, I do not know for certain if there are any 2050s in
>> captivity with ISB, but I'm inclined to believe the engineer I spoke with.
>>
>> Best regards,
>>
>> Charles
>>
>>
>>
>>
>>
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