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Hi,
Rik.
I have
built Jim's phasemeter and used it on 137 kHz. It seems to work fine on 475
kHz also, although it seems more sensitive on 475kHz. You could take the DC
output from the phasemeter and feed it back up the coax to the shack for a
remote indication. Or you could use the output of the phasemeter to control the
motor directly. I think that Marcus has some arrangement like
this.
73,
Dave G3WCB IO91RM
I had a look at the M0BMU LF tuning meter and will built it.
Does anyone used it on 475/500 kHz? Maybe the transformers need to be
adapted but that should be no real problem.
73, Rik ON7YD - OR7T
Oh yes, or, a phase meter (M0BMU) and a battery operated variometer
motor. Without an additional cable to the shack. Then the SWR meter in the
shack confirms that everything is fine. 73, Stefan Am 08.11.2013
19:40, schrieb pat:
Hi All,
A suggestion: battery operated
tuning device at antenna end and "wireless" link back to shack. Wireless can
operate at a non-interfering frequncy
(HF/VHF/UHF/Optical).
73
On 08/11/13
16:09, Stefan Schäfer wrote:
Hi Rik,
Am 08.11.2013 16:06, schrieb Rik
Strobbe:
Hi Stefan,
remote tuning of
the loading should be done by optimizing SWR
(at the TX), not for maximum RF current.
If one keeps that in mind there is no
problem. ...which is in agreement with what i
said.
But once you have matched your antenna to 50 Ohm on resonance and
you can only vary the reactive part of the antennas impedance (after doing
QSY), then you will get the maximum antenna current at best SWR (assuming
that Rrad+Rloss is constant which is not to far from reality).
I am not sure if I will keep
the remote variometer tuning. It needs some
extra wires to the loading coil and
I am not sure how long the small DC
motor will function properly with all the rain
and frost coming up. Here it holds since more
than 2 years for LF now..
73, Stefan
--
73 de pat g4gvw
es gd dx
qth nr Felixstowe
East Coast UK
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