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different set up and finals to the KL203 and KL503 HD

A standard 4w AM radio won't hurt a KL203. If it gets hot put a fan on it. The new KL203's are handling 12w Pep radios just fine. Just don't run it too long on FM!

turn off the Noise Blanker?

Easy to turn down the RF power on the AT-6666 to whatever you want as long as nothing has been touched in the radio. The problem willbe when he turns on the amp and forgets to turn down the power on the radio first! Good radio. Should have got a bigger amp like a TS DX500...then he will get...

be careful when using the AA-35 Zoom (and possibly other Rig expert analysers) on a non grounded antenna system like an open dipole. Always short out the antenna lead to ground before fixing to the Analyzer as built up static can and has wiped out the little resistors on the input of the...

Here are a few for you!

OK Got it... you used the IRF 9530. My bad. How did it go? I sell a bunch of the KL203. It is a good little amp for 80-100w out. Seems to handle 20w drive with no issues. I just keep RM3's and spare boards on hand.

Did you really replace the little RM3 Mosfets in a KL203 with the larger EKL 9530 mosfet? Any pictures? Surprised you found enough room. Be an interesting amplifier! Did you need to change any other components?

5 euro each according to May price list

Guys, RM Italy sell the RM3 part. Just tell them you need 16 matched to fix your 703 and they will send you a price. Its not too bad. At least a good chance the 703 will work properly again.

Shes a monster for 500w! Compare the heatsink to a Texas Star dx500! They hardley get warm at 450w.

Hard to beat the At 6666 for the price these days!

Reflow the filter section is what I was trying to say!

Those are prone to dry solder joints on the filter section. Especially if it was one of the older ones. Very susceptible to RF getting back in as well. Test with dummy load. I have found the kl500 505 series to be far more reliable in use. Those HLA 300 with all the shut down circuitry and...

If you were to put a 50 ohm dummy load on the end of your coax that fits into the antenna you will probably see a low swr anywhere on your coax. Your results tell us that you have not tuned your antenna to 50 ohms or anywhere close so it will not be working as well as it should. Thus a retune...

Sounds lovely, but what counts is the SWR that the amp is seeing. That is the important one to go for. Keep fiddling the coax length till it comes down. Sounds like you have tuned the V quad and the coax instead of just the V quad. There is only one way out of it from here. Put the swr meter at...

Where did you place your meter when tuning the V Quad? Hopefully right at the antenna. Possibly the additional coax jumpe is causing the SWR to rise. Vary the jumper length and see if the SWR changes much.

That design here is commonly called a station master. Possibly not the most efficient of radiators but seems to hold up well in our windy conditions. Appreciate any thoughts and advice you may have on the subject.

HI Homer, I would like to build a half wave vertical. The one with the radiator fed with a tapped coil. How much radiator is below the tap in point? Does it matter? It would be much stronger if the aluminium radiator was inserted through to the bottom of the "C" clamp inside the PVC section...

V Quads are just not worth the effort of keeping them in the air. So much torque going onto the boom from the 13ft arms. Expect to see it hanging on a weird angle or flopped right over before too long. Amazed they only had 2 clamps on the boom to mast plate. Wait till you see it in a decent...