My 6600M seems to be all over the place with output power. It depends on antenna, temperature, and else... My external W2 watt meter gives me readings of anywhere between 97 and 110 W. I have set the rig to 100W. Is it possible that the output can be monitored and more accurately be controlled? 110W is a little high if I run LP in a contest.
de Roger W6VZV
Don’t take the meter readings too literally. Even very good wattmeters have error margins, from +/- 3 to 5% and often higher (and don’t forget that also applies to the rig’s power settings). The impedance presented by the loads can also affect the readings, as can meter placement. I agree with Roger and Mack, you’re right in the ballpark.Howard
Initially, I thought it was RFI on my ethernet cable/computer, though this was possible it really more broadly issue #1 below.
I found two issues.
1. Common mode RF getting into outboard tuner WM (the tuner also would get flakey at times) , and also affecting the SSDR WM reading. This I fixed by carefully following best practices for bonding and grounding of equipment (52 years-what the heck!). Also, the real issue was from an antenna problem (and feed). This had to be corrected. A new homebrew current balun helped. The root cause of CM is often the antenna system.
1.a. I had the crash problem with the dummy load also. This was a bad connector install on some old RG8X. I replaced all of the in shack jumper cables with LMR-400 and carefully installed connectors.
1.b. LMR-400 is well shielded, better than 8X, 213 etc. I guess LMR-240 is as good.
1.c. Lots of ferrite cores, #31.
2. The arc plug (for a 100w rated plug) in my Alpha Delta was firing under certain conditions of my multiband, open wire fed dipole. This would appear as a short to the 6400, and protecting itself from my mistake, instant shutdown-crash. Not pretty.
So, this seems to have been multiple causes. Good luck. More sanity than I could afford to lose was lost in the episode.