After hooking up
my 6500 to the Elecraft KPA500 and KAT500, I am unable to get the 6500 to key the Amp. I currently have the RCA TX1 from the 6500 connected to the KAT500, then the KAT500 PTT RLY connected to the KPA500 PA Key. I have a coax cable on antenna 1 on the 6500, and it is connected to the RF Input on the KPA500. Another coax able is connected to the KPA500 RF Out to the KAT500 XMTR.
I also enabled the TX1 in SDR v1.6.21 Transmit settings, and disabled the ATU on the 6500. When I press the tune button on the 6500, the KAT500 tunes and the frequency data changes to the corresponding band on the KPA500. When I press the PTT on the mic and transmit, the 6500 transmits, but the amp is not keying. The RF power on the 6500 is set to 25 watts. The amp is in OPER mode and indicates *PWR 0 on the display. No power LEDs or SWR LEDs illuminate. I am able to make contacts from the 6500 when I have the amp in standby mode. By the way, I am not using DDUTIL att.
Any ideas as to what I am missing to configure with my setup?
With my linear I needed a relay in the TX1 line as it did not like the current being drawn by my THP linear PTT circuit. If it does ground, you are nearly there. Put a relay in the line so that the relay will close your PTT circuit. If no grounding on transmit, then your setup of your Flex is not correct.
Enabling TX1 in your transmit settings is a start but have you written that into a profile? If not, it will probably default to no transmit options being enabled. I have seen this happen many times until people write the transmit settings into a profile or all their profiles so TX1 is set for what you want.
In the Radio Setup Transmit menu pull up each profile that you want to write this to and TX1 should then be part of all those profiles.
Good luck. Brian.
All you need to do is accidentally key up with 100w on cw into your amp and you can kiss it goodby. I know because I've had it happen to me. I know, the KPA500 is suppose to be fool proof, but I can attest to the fact it will damage the PA immediately.... I don't know WHY Flex sets the power output default to 100 watts, but they do. All you need is a hiccup in the software and not notice that the PO has defaulted to 100w and without DDUtil keeping a watchful eye, you can say goodby to your amp. Oops.....
I'm sure I'm not the only one this has happened to....
In relation to setting power levels, I fully endorse Norm's comments about DDTUil. There is an additional way to limit power out, using your Profiles and going to your Radio Setup menu, Transmit submenu and on the left hand bottom column you can adjust your output power to whatever level you want. In my case on 2 metres I need 50 watts to drive my linear, so I adjusted the power level until it read 50 watts, stored that in my 2 metre Profile and I no longer have to worry about power levels. Profiles are a very powerful tool! You will know it is working as your RF Power slider will not allow you to go beyond the level you have set.