[Elecraft] T1 Remote Tuning and Power Supply

[Bill K9YEQ]

George,

I would be most interested in what you come up with?  IF you have the time
please keep me informed.

Bill
K9YEQ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of GeorgeP1111
Sent: Tuesday, November 16, 2010 11:25 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] T1 Remote Tuning and Power Supply


I am in the process of slowly reconfiguring my station for the inevitable
future move to a condo or antenna restricted area where I will have to play
the "Stealth" antenna game.  My station comprises of a Yaesu FT-817ND, W1
PWR/SWR Indicator, 3ft diameter remotely tuned home built 20m-10m Magnetic
Loop antenna, and a 80/40 meter Trapped Dipole using the T1 Tuner for fine
tuning.  I figure I can always wrap plastic flowers around the Mag Loop and
pass it off as a Christmas Wreath, but I will still want some sort of
outdoor wire using the T1 tuner for the lower bands.

I want to use the T1 at the antenna end vs the radio end as I am now.  I
know that the T1 has the ability to be remotely tuned via the port on the
side, but I want to kick it up a notch.  I'm running DC up the coax to
control the capacitor motor in my Mag Loop using the standard
inductor/capacitor configuration, and I want to follow the same plan for the
T1.  The idea is to use a push button to supply the 9v (I'll probably use a
higher voltage and reduce it at the tuner to compensate for line loss) via
the coax to the T1 (vs using the internal battery) and a LM556 Dual Timer at
the T1.  Key Up, Push and hold the button, the T1 turns on and boots up and
at the same time the LM556 starts timing.  After a preset amount of time (1
second?) the LM556 would pull the Tune line low via a Optical Isolator for
say 1 second starting the Tune function.  Watch the SWR on the FT-817 or the
W1 and when it stabilizes low, release the button and unkey.

Granted, I could leave the internal battery installed and just use the 9v to
pull the Optical Isolator low but by adding the LM556 I can eliminate the
battery as well.

I know the power via coax will work, and the LM556 (or even a PIC) will
work, so I guess I'm asking if there is a problem with turning On/Off the
power to the T1 and is 1 second enough time to stabilize prior to initiating
Tune?

tnx

de George
WD0AKZ
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