Keyboard Shortcuts
Likes
Search
New member
|
Wheeler M
开云体育Welcome aboard Pierre ? 73 Malcolm ZL2UDF ? From: [email protected] [mailto:[email protected]] On Behalf Of Pierre Guillot ? Owner since 10 years of a FT-897D I wanted to join this group as these two tranceivers share the same electronics. |
|
Skip,
I wanted to ask you a question about the ATAS system. I happen to have a Tarheel screwdriver antenna and I have looked at the ATAS control board and I am looking into adapting the circuit to drive it from my FT857. I plan to use + 12 volt from the car to power the system for the antenna drive power and the signal from the FT857 to the comparator circuit to determine to stop, drive up and down. Do you have an opinion (other than to scrap it and buy ab ATAS system HiHi)? Thanks. Best regards, JD. KE4MD |
开云体育Hi JD, ? In order to control the Tarheel from the A%&, you would need to monitor the DC voltage on the antenna connection to the antenna. The Yaesu rigs pout out 12V to extend the antenna, i.e. go lower in frequency, and 8V to shorten it (go higher in frequency). ? Be aware that, even if the Tarheel can do 80m, it won’t be able to using the ATAS control as the Yaesu rigs will not do auto tuning below 40m as the ATAS antennae only go down to 40m. ? It may be possible to use the Tuner option instead of the ATAS option in menu 85 but would require an external control system of some sort. ? 73….Eric VK2VE ? From: [email protected] <[email protected]> On Behalf Of J.D. Barron - jeter.d.barron at gmail.com
Sent: Thursday, 31 December 2020 02:34 To: [email protected] Subject: Re: [FT-857] New member ? Skip, |
|
Thanks for the reply Eric.
I don't plan to use the 80 meter band mobile. I have the manual switch if I need to use that and I really don't plan to tune driving down the road, but rather more of a portable operation. Since the Tarheel requires 12 volts for the motor I was going to bring that in separately. I assume that there is a quiescent voltage range between 8 and 12 volts. A comparator could be setup to determine up or down like the ATAS circuit. and select the drive polarity to the motor. I thought that it would be a nice project. Thanks again for the reply |
开云体育I'd recommend the Turbo Tuner. It works with most antennas and uses the TUNE button on the 857D to start the tuning cycle.Randy (KE5EOT)
ARRL, QCWA, ARES, RACES, ROWH
On 12/30/20 9:34 AM, J.D. Barron wrote:
Skip, |