On Aug 23, 2023, at 13:09, Randy <wrmoore47@...> wrote:

I'm getting a little over 4 watts into a dummy load on 80m and 60m. All other bands are 3.0w-3.5w. I would like to get all bands >=4.0 watts.? I've tried compressing and expanding all the low-pass filter torroids. Its difficult to get much movement out of the turns, and hardly any change in output power. For one thing, I guess I wind my torroids fairly tightly, and for another all the LPF torroids are squeezed onto the board such they all touch one or more other components and I can't get some turns moving around the contact with those components.

I probably should be happy with what I've got, but are there other tweeks I should be trying? If anyone has gotten higher output by tweeking the LPFs, let me know which ones and whether you compressed or expanded. Or if you added or removed turns.

73,

Randy, KS4L

Why? Nobody will know the difference, you are chasing unicorns, leave it as it is and use it.

On Wed, 23 Aug 2023, 19:18 Cliff, <ae5zaham@...> wrote:

I ended up adding a turn to the L513 toroid for 20-30M. Gave me an extra watt. Squeezing the turns helps some so figured adding the turn was going the right way. It may not always work that way depending on circuit values.

73,
Cliff, AE5ZA



On Aug 23, 2023, at 13:09, Randy <wrmoore47@...> wrote:

I'm getting a little over 4 watts into a dummy load on 80m and 60m. All other bands are 3.0w-3.5w. I would like to get all bands >=4.0 watts. I've tried compressing and expanding all the low-pass filter torroids. Its difficult to get much movement out of the turns, and hardly any change in output power. For one thing, I guess I wind my torroids fairly tightly, and for another all the LPF torroids are squeezed onto the board such they all touch one or more other components and I can't get some turns moving around the contact with those components.

I probably should be happy with what I've got, but are there other tweeks I should be trying? If anyone has gotten higher output by tweeking the LPFs, let me know which ones and whether you compressed or expanded. Or if you added or removed turns.

73,
Randy, KS4L

Hi Mike,

Nope, I built for 12V. Changed L513 back to 10T and squeezed turns. Played with L512 to optimize 40m (and 60m). Now have right around 6W on all bands with 13.8V PS.

120 ohms looks good for display brightness. I only had 0805, the 33 ohm is a 1206, but the 120 ohm 0805 does not get warm or hot so think it is fine.

I'll say it again, what a fabulous rig!

Thanks and 73,

Robert, WA2T

Why would 5W at exactly 9V, for the 9V version be ok, but 5W at exactly 13V, for the 12V version, be dangerous? FWIW, I’ve ran my QMX off a LiFePO4, transmitting with as high as 13.8V, but mostly in the 13.2-13.3V range, with no problems. But to be fair, I’m using a manual tuner. But again, it borderline feels like what I’m reading, on a near daily basis, is running more than 4W at 12V is a sin.

Why would 5W at exactly 9V, for the 9V version be ok, but 5W at exactly 13V, for the 12V version, be dangerous? FWIW, I’ve ran my QMX off a LiFePO4, transmitting with as high as 13.8V, but mostly in the 13.2-13.3V range, with no problems. But to be fair, I’m using a manual tuner. ?But again, it borderline feels like what I’m reading, on a near daily basis, is running more than 4W at 12V is a sin.?