I misunderstood what the original poster wanted. My Poly
specials do NOT pass DC on the center conductor. That is
what separates Poly from the rest of the crowd and makes
their suppressors superior.
Nevertheless, what the specials do (and they are essentially
bias tees) is take the RF and DC control voltages that are
common on the center conductor, separate them, protect them,
and then recombine them. All Poly's bias tee products do
that. Mine were specifically designed for ham radio
applications based on conversations I had with numerous hams
at Dayton and my own experience. The primary audience are
those who do EME or other weak signal work, where they have
a pre-amp that is line-powered.
As to Smith Industries. Based on my experience at Poly and
what I saw transpire at Times Microwave, all I can say is
that the Smith representative, who shall remain nameless,
did effect numerous changes. Maybe they were good changes
business-wise but my view of them were that they were
customer (and especially ham-radio) unfriendly--at least for
the individual customer; not for the distributors,
representatives, and big companies.
73
Bob AA0CY
-----Original Message-----
From: Jon Ogden [mailto:na9d@speakeasy.net]
Sent: Saturday, September 28, 2002 9:13 AM
To: Bob Wanderer; brewerj@squared.com;
towertalk@contesting.com
Subject: Re: [Towertalk] Supressors that pass DC control V.
I was thinking about this again this morning while laying in
bed waking up
(no idea why - I guess I just have a twisted mind!).
The original poster wanted a suppressor that would pass DC
through the
center conductor. You say that Polyphaser has done this.
That may be true,
but there's another problem. In virtually all suppressors,
the center
conductor is somehow DC connected to ground as well.
Therefore, even if you
find a suppressor that is DC coupled, you still can't pass
DC on it! The
only thing that would work is just a straight gas discharge
tube to ground.
But then you don't get any of the beneficial benefit of
draining static off
the center conductor, etc. So putting a bias tee on the
antenna side of the
suppressor is really the way to go here, IMHO.
Secondly, about Smiths buying PolyPhaser and un-ham-friendly
rules - that's
too bad. I must say that Smiths does do a pretty decent job
though of
leaving companies they buy alone for the most part. I
currently sell for
two Smiths owned companies that sell RF related stuff.
While there were
changes, I am genuinely surprised at how transparent things
have continued
to run. For a "large" company, they do a pretty good job.
73,
Jon
NA9D
on 9/27/02 8:07 PM, Bob Wanderer at aa0cy@vrinter.net wrote:
> PolyPhaser does. It is a non-catalog item or "special."
I
> don't know if Poly does specials anymore. I created
several
> of these specials in, I think, 1996 or 1997. The part
> number, therefore would be 96(7)-xxxxA-(letter). The xxxx
> would be a month-day numeric. As an example, if the
> paperwork got approved on November 4, 1997 and it was the
> first one I did that day, the part number would be
> 97-1104A-A (if it were the second the last character would
> be a B and so on and so forth). See if you can get ahold
of
> either Tricia Eaton or Pat Heeren. They were around in
the
> good ole days (before Roger sold Poly to Smiths Industries
> who instituted some ham-UNfriendly rules) and I think
> they're still there. If you do get one of them, tell them
I
> suggested contacting them and you need one of the ham
radio
> specials I created.
-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)
Life Member: ARRL, NRA
Member: AMSAT, DXCC
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
|