[Premium-Rx] Rockwell HF-2050

[Walter Salmaniw]

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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