The choke might help correct my issue, i don't know yet.I tried a different antenna and had the same issue. I installed a Balun choke (RF isolator) after the amp and it fixed the problem entirely. The question is why do I need the choke?
Probably common mode current on the shield. A few ferrites would likely have done the same thing. The RF isolator is just a choke, not a balun at all.I tried a different antenna and had the same issue. I installed a Balun choke (RF isolator) after the amp and it fixed the problem entirely. The question is why do I need the choke?
I think I'm going to upgrade the coax for better shielding too. That might fix the issue. I already had some beeds on there and it was still doing it.Probably common mode current on the shield. A few ferrites would likely have done the same thing. The RF isolator is just a choke, not a balun at all.
What feedline you using now?I think I'm going to upgrade the coax for better shielding too. That might fix the issue. I already had some beeds on there and it was still doing it.
I tried a different antenna and had the same issue. I installed a Balun choke (RF isolator) after the amp and it fixed the problem entirely. The question is why do I need the choke?
.... I'm also going to try another antenna all together as I used the same mag mount and coax with the two antenna's I tried...
Then my station must have a serious issue, 40 watt carrier on ten meters gives an SWR of 2.5:1, & with a 10 watt carrier the SWR was 1.5:1
I trust the meter, in so far as the reading is an indication of a problem comparing the SWR reading at both power levels.
... signal at the antenna just to have it reflect back into the meter/radio/p.a. because of course the antenna is only (really) resonant at the target frequency...
RF is feeding back from the final transistors into the driver. The added power you see when it "jumps" is mostly NOT on your channel frequency, but at a different one generated by the feedback.
Usual cure is to insert a choke or two, with disc caps to ground on the power where it feeds into the driver transistor.