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-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of GeorgeP1111 Sent: Tuesday, November 16, 2010 11:25 AM To: elecraft@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 -- View this message in context: http://elecraft.365791.n2.nabble.com/T1-Remote-Tuning-and-Power-Supply-tp574 4646p5744646.html Sent from the [MM] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
