[Elecraft] Internal tuner with random wire

[Jim Rhodes]

Sure if you have the time and supports, but if you are setting up a
temporary station for a few hours you don't want to waste operating time. A
9:1 or even 4:1 unun can get you on the air quick. Need only 1 support. A
counterpoise and a choke of some kind on the feedline does help.


On Sat, Dec 12, 2020, 23:22 Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:

> The comments are good .  But considering all the pluses and minuses,
> wouldn’t it make more sense to use a OCFD and not worry about ground rods,
> counterpoise needs, high SWR, high voltage and currents in the tuner?   A
> well designed OCFD with correct Balun plus a common mode choke at the feed
> point and another at the radio will cover 80M - 10M with much less than a
> 10:1 SWR.
>
> A matched condition exists only between the ATU input and the PA output.
> The output voltage or current can be all over the place, including inside
> the ATU circuits.   And the ATU has a 10:1 matching range of 5 ohms to 500
> ohms.  Random wires can easily be outside of this range.  Thus the ATU can
> not effectively match the load.
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to jimk0xu at gmail.com