[ARC5] AN/ARC-12, A.R.C. Type 12, Other Things.

[Tim]

Hi Guys - Some APR-1 & APR-4 info I have found:
The TN-17 Tuner covers 74-320 mc and includes 2 type 955 acorn tubes for a
mixer and local oscillator function.  With the TN-17, sensitivity is
200-700 microvolts (in the 140-200 mc range) to produce a half-scale meter
reading.  The 300-1000 mc Tuner uses a 1N21 mixer diode "front end".
Apparently plenty adequate for hearing an multi-kilowatt ERP radar aimed at
you over a LOS path....

The tuners seem to be pretty much interchangeable between the APR-1 and
4....
Here's a little research I did on the APR-1 system, plus some usage
observation around here:
http://www.n6cc.com/an-apr-1-apr-4-radar-comm-surveillance-receiver

It works great!
Tim
N6CC

On Thu, Oct 8, 2020 at 10:14 AM Roy Morgan <k1lky68 at gmail.com> wrote:

>
> > On Oct 4, 2020, at 5:08 PM, Mike Morrow <kk5f at earthlink.net> wrote:
> >
> > Hi Dave,
> >
> > I didn't mean my post as a correction, just a lead-in for remarks on the
> AN/ARC-60 and its CV-431A.  For many years I assumed that it must be pretty
> deaf with only a 1N82 diode mixer as its entire UHF front end.
>
> At least some of the plug-ins for the APR-4 and APR-4Y use diode mixers.
> Perhaps the lowest frequency ones use a tube, not sure at all.
>
> I wonder what their sensitivity was/is.  I may still have a few of the
> antennas from the APR-4 system.  They are silver plated.  I assume they
> were covered by a fiberglas housing on the aircraft (EA-1’s at least).
>
> Roy
>
> Roy Morgan
> K1LKY since 1958
> k1lky68 at gmail.com
>
>
>
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20201008/92d787f8/attachment.html>