[ARC5] Re: Harmonic "suppression" in ARC-5s

[Bob Macklin]

If you us an unmodified ARC-5 Tx with the kind of antenna they were designed
to be used with they will work just fine.

OTOH:

If you want to use an ARC-5 Tx with a better antenna then the conversion
articles are where to start.

My first Novice transmitter in 1957 was a 40M 6AG7/807 link coupled design
from an early 50's ARRL handbook. I did not have a LPF and I did not get TVI
complaints.

Operating an ARC-5 Tx in it's original configuration is different from
operating them in typical ham service.

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

----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: <ARC5 at mailman.qth.net>; "Bob Macklin" <macklinbob at msn.com>
Sent: Sunday, December 14, 2008 7:51 PM
Subject: Re: Harmonic "suppression" in ARC-5s


> On 14 Dec 2008 at 19:04, Bob Macklin wrote:
>
> > Neither way is correct for an ARC-5 Tx as designed.
>
> Of course not: but that isn't the point, nor the answer to my
> question.
>
> Again:
>
> what might be the difference, in your opinion, in the amount
> of harmonics transmitted between:
>
> 1) maxing out the link, and setting the loading to zero, and
>
> 2) tapping the antenna directly to the plate coil?
>
> Remember, I'm (obviously) really, really stupid and am
> asking for your expert advice...
>
> And here's a related question:
>
> We think that the antenna impedance for the ARC-5s in
> normal use was somewhere in the vicinty of 5 to 12 ohms.
>
> So, what was the plate impedance, that is, the impedance
> at the plate connection of a pair of 1625s, under normal
> conditions of voltage, current, and frequency?
>
> > > Perhaps you would be so kind as to tell me what difference
> > > there might be, in your opinion, in harmonic output
> > > between:
> > >
> > > 1) maxing out the link and reducing the loading coil to zero,
> > > and,
> > >
> > > 2) simply tapping your antenna directly to the plate tank
> > > coil?
>
> Ken Gordon W7EKB
>