|[AMRadio] Legal-Limit tuner advice....?|
jpl15 at panix.com
Fri Aug 18 00:52:16 EDT 2006
On Fri, 18 Aug 2006, W7QHO at aol.com wrote:
> In a message dated 1/12/06 8:31:16 AM, jpl15 at panix.com writes:
>> On Wed, 11 Jan 2006, W7QHO at aol.com wrote:
>>> Quick and dirty, just try grounding one side of your ladder-line at the
>>> end and feeding the other side off the single ended output of your ATU and
>>> see what happens. SWR figures might be better (but could also be worse).
> Did you ever try this? If so, what were the results?
Yes, I did - results not good at all, antenna would not tune and the
Transmitter complained at me bitterly... ;} I also built in a DPDT
knife switch in the feedline after the tuner - it's mainly for grounding
during t-storms, but I played around with various (semi-calculated) values
of capacitors and coils... on 10 meters the use of various paralelled
caps made improvements, but tuning became very critical, and there's
nothing much that interests me up there - I *do* like to work 20M RTTY ,
and have yet to try PSK32 into the Valiant.
I'm still gathering facts, and the Listmembers have been quite helpful -
everyone likes the Palstars, but the big Ten-Tec also has impressive
specs.... I intend on converting a broadcast transmitter for use in the
shack, so the Tuner needs to be able to withstand 100% duty-cycle at
Legal Limit. Ultimately I'll tune the feedpoint of the antenna itself,
and just run 50-ohm line from the transmitter out to the "doghouse" if you
Who just shut the rigs off after a nice AM QSO on 80....
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