What is your resistance of the key line out of the sdr1k..?? its
probably not low enough to reliably key the Harbach unit..
they spec the keyline only at 0.7VDC at 1.5mA.
I had a similar problem and installed a ptt buffer board from Down East
Microwave.
http://www.downeastmicrowave.com/PDF/Pttx5.pdf
Its only $25 for 5 separate units and they use good dpdt relays..then
u can switch about anything on tx and rx
so no.. i dont have a better idea...
W9RAY
Jerry Sharp wrote:
Hi all, I just recently picked up a nice Heathkit SB-200 amplifier to
run with my SDR-1000. The SB-200 has the Harbach softkey mod, so the
keying line has only a couple of volts and milliamps on it.
Problem is the X2 port on the SDR won't fully key the amp. I can hear
the amp relay "click", but I show no idle current. When I apply drive
the amp relay starts clicking and cycling. Power out of the amp is all
over the place.
A direct short to ground across the keying line and the amp works
fine...90ma of idle current and 600 stable watts out when I drive the
amp with the SDR. For the time being I'm using a footswitch to key
the amp. But I'd rather have the SDR directly keying the amp.
So other than adding another relay between the X2 port and the amp
keying jack, does anyone have a better idea?
BTW, I've tried pin 7 plus several other X2 keying ports with the same
results. X2 TR sequencing is turned on.
Thanks,
Jerry Sharp, KD0GS
_______________________________________________
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
Knowledge Base: http://kc.flex-radio.com/ Homepage:
http://www.flex-radio.com/
------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.339 / Virus Database: 270.12.45/2141 - Release Date: 05/29/09 06:28:00
_______________________________________________
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
