http://elecraft.85.s1.nabble.com/T1-Remote-Tuning-and-Power-Supply-tp5744646p6159808.html
of 50ft in the air at the midpoint. The ends are a bit higher. The T1 is
via a Elecraft 1:1 balun. I remote control it via the circuit on my website
www.jtmiller.com . I find it gets a 1:1 match on 80-6 meters. It is
warmer at 80M and below. But that's just what this length dipole does
capacity hat on 80-160 and found it works quite well. The T1 is very happy
matching that on 80M and gets to about 2:1 on 160. I use my K3 internal
readings. The loss due to this level of SWR on 160 with RG213 is
> Hi Bill....
>
> Quite a while back you sent me this request (I didn't forget). I'm done
> with the schematic of the T1 remote tuning interface that I hope to find
> time to build. If you are still interested, I can shoot you over a copy of
> it. The Tiny CAD program I use to draw schematics only allows me to export
> them in .emf format, but using Windows Viewer (double click on the .emf
> file) will allow it to be viewed and printed.
>
> Anyhow, I was going to use the T1 to tune a 88' dipole fed with twin lead
> to be used as a multi-band antenna, but upon further research on this
> antenna I don't think the T1 has enough to be able to tune it. I am still
> going to build the interface because sooner or later I will probably be
> moving into a restricted area and need to use some sort of stealthy antenna.
>
> 73's
> de George
> WD0AKZ
>
>
>
> 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: [hidden email]
> [mailto:[hidden email]] On Behalf Of GeorgeP1111
> Sent: Tuesday, November 16, 2010 11:25 AM
> To: [hidden email]
> 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
> --
> View this message in context:
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