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: 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:[hidden email] 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:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ------------------------------------------------------------------------------ View message @ http://elecraft.365791.n2.nabble.com/T1-Remote-Tuning-and-Power-Supply-tp5744646p5744981.html To unsubscribe from T1 Remote Tuning and Power Supply, click here. -- View this message in context: http://elecraft.365791.n2.nabble.com/T1-Remote-Tuning-and-Power-Supply-tp5744646p6158175.html Sent from the Elecraft 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
