[ARC5] QST articles.

[Bob Macklin]

I was in the USAF in the mid 50's when the ARC-5/SCR-274 stuff was being
given away by MARS. FREE! Many new hams used the rigs to build their first
station. In the case of Novices they had to be converted to crystal control.

I learned about these while I was in the USAF as a radar tech. As late as
1958 we were still using a lot of WWII gear.

These transmitters were designed for use with non resonant antennas. The
fighter aircraft only had one antenna. And it was to short to be resonant
for any of these transmitters. That's why each transmitter had the tunable
inductor to set the transmitter to the antenna.

You can use the these transmitters with a 1/4 wave end fed wire. A lot of
people did.

Bob Macklin
K5MYJ
Kent (Seattle), Wa,
"Real Radios Glow in the Dark"



----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: "Bob Macklin" <macklinbob at msn.com>; <ARC5 at mailman.qth.net>
Sent: Sunday, December 14, 2008 5:10 PM
Subject: Re: [ARC5] QST articles.


> On 14 Dec 2008 at 16:33, Bob Macklin wrote:
>
> > There is NO HARMONIC suppression built into ARC-5 transmitters!
>
> OK. You're probably right. You obviously know far more
> than I do about the subject.
>
> However, if you read the links I gave you to David Stinson's
> notes on measuring harmonic rejection in the ARC-5s, you
> might come to a different conclusion.
>
> Maybe I am misinterpreting his data, but I don't think so.
>
> In any case, by reducing the loading coil to zero and
> maxing out the link coupling, you would, automatically, be
> reducing any harmonic suppression there MIGHT be there
> to zero.
>
> It has always been my contention that the more of the right
> "stuff" you can put between the harmonic generator and the
> antenna, the fewer the harmonics radiated.
>
> Remove all that, and the result is more harmonics.
>
> Make sense? It does to me.
>
> But what do I know?
>
> Nothing...
>
> Quite obviously...
>
> Ken Gordon W7EKB
>