Re: {Collins} Antenna tuner question



Here's the link to the PDF file for Reflections III.

www.w3pga.org/Antenna%20Books/Reflections%20III.pdf

Jim - N0EKO

On Wed, Oct 11, 2017 at 12:53 PM, Roy Morgan via Collins <
collins@xxxxxxxxxxxxx> wrote:

> Jim,
>
> It is the 180L-2 or 180L-3, depending on whether the thing is equipped with
> the antenna changeover relay or not.  (Yes, the 180L-2 and 180L-3 differ in
> that the L-3, I think, has the antenna relay).
>
> One problem with these things is that they require 24/28 volts to run most
> things in there (2 amps) but also need 115 volts 400 cycles to run the
> phase detection system that is essential for it to operate.  This voltage
> needs to be of low  power only, it is not used as far as I remember to run
> anything but the detection circuitry.  60 cycle power will not do the job!
> The web site shown below indicates 15 watts.
>
> The antenna relays are more than somewhat fragile, as is the vacuum
> capacitor that is in there.  Dropping one of these quite heavy boxes is
> both a danger to your toes, but also a danger to the relay and the variable
> capacitor.  If your tuner rattles with broken glass, and it is the
> capacitor, give up all hope of getting it to run.
>
> Note that they are meant to operate in aircraft, so at altitude the
> breakdown voltage requirements of the various parts influenced the design a
> lot.  So... you may well be able to manage more power at normal human
> altitudes than it was meant to handle at altitude.
>
> Note also, the antenna it was meant to tune was quite short electrically
> (at least for much of the HF frequency range - 45 to 100 feet) compared to
> what a ham operator may have.  Just the same, if you can get one running,
> I'd expect you wold be quite impressed with its performance.
>
> These may have been used with the ART-13 transmitter, I'm not sure.  There
> is an indication they were used with the 618S-1 and 618S-4 transceivers.
>
> You can read a moderate amount about this magical box at:
>
>  http://g3ynh.info/atu/180L3/man.html
>
> That site includes a circuit diagram but neither the text shown nor the
> diagram tell the name of the manual they are from!
> A request to the Collins list in 2008 brought no responses.  I am sure
> there is or was a manual for these, but a quick web search brings no other
> good results.
>
> Note: tuning an antenna AT the antenna feed point with a remote antenna
> tuner, is simply NOT required. Search for and read (if you can) Reflections
> III for full details.
> Buy one for $183 on Amazon at
> https://www.google.com/search?q=refkectuinss+III&oq=
> refkectuinss+III&aqs=chrome..69i57j0l5.4191j0j4&sourceid=chrome&ie=UTF-8
> or search the web for the PDF version I was able to find some time ago (not
> easily just now).
>
> I"d be glad to learn of a source for the military manual for the 180L-2 and
> 180L-3.
>
>
> --
> Regards,
> Roy
>
> Roy Morgan
> k1lky since 1958
>
> -----Original Message-----
> From: Collins [mailto:collins-bounces+jonesjames=imonmail.com@
> listserve.com]
> On Behalf Of Jim Pruitt via Collins
> Sent: Wednesday, October 11, 2017 12:41 AM
> To: collins@xxxxxxxxxxxxx
> Subject: {Collins} Antenna tuner question
>
> Can someone tell me the Collins model number of the antenna tuners that
> used a motorized roller drum with silver plated ribbon
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