The FR design is unimpressive at best. Just another copy of a bad copy. Its also only targeted at 40M, everyone has done that with sorta ok result. Also using -43 material is not advised as its lossy

w2eck, My amp is MRF174 so 28V is magic. I have no need to adjust as the target amp is 28V. They sell a 24 volt unit and maybe others. By passing is current mode chokes with caps to ground at the ends

I forgot to point out the specs call the RD16HHF1 as a 16W device not 20! The other factor is for specified conditions the Vdss is less than 16V nd no more than 16W so it can meet SWR tolerance. That

Kees, Vdss is 50V but you would never run at 50V as that also the avalanche failure voltage. Vdss for IRF510 is 100W. for comparison. In actual operation you would like to be under 1/4 Vdss. That allo

Other vendors I've used... along with Mouser and Digikey. Allied.com Danssmallparts.com Jameco.com MPJA.com ------------------------------- Please reply on list so we can share. No private email, it g

I use one of these from amazon... Its a 12 to 28V but they also have 24V maybe others. https://www.amazon.com/DC-DC-module-280Wmax-supply-converter/dp/B00M3ZQVGW/ref=sr_1_3?dchild=1&keywords=12v+to+28

Kees, I watch your work and even built one. About the best try of everyone. No one has bettered that. I found that from 5W to 20 was not a good step. More like 40 or 50 was enough. The reality is 20W

Since 5V is used in more than a few places on the board Id assume short maybe at the regulator but anywhere is possible. Allison ------------------------------- Please reply on list so we can share. N

Well finally someone that realizes that the RDparts are not ne plus ultra or anything other than expensive. Several other tried and had to work like mad to get to 20W barely. Doing RF power uising LDm

Interesting two amps at the link one does 100W the onter near 50.. THe 100W unit uses 10in a 5x5 push pull and does about half the power of my 4x4 6M (220W at 28V) unit with the same IRF510s. That's p

#linear

Dave, You have resources for space I only wish I had. To me its a mater of how much sweat and wire you willing to apply. The biggest item is with that much soacee all the noise generators are under yo

Mike, when its published, if ever, otherwise there are no links or pointers. Allison ------------------------------- Please reply on list so we can share. No private email, it goes to a bit bucket due

No I retired when the boutique firm I was employed by more or less collapsed. At that time I was doing antenna research and development from near DC to SHF. I amuse myself with projects like putting a

That's great info. I was trying to avoid a deep esoteric look at panels as for the small portable its approaching excess depth. For the average 20W panel the impact is smaller. Bigger issue is is pane

How to solar panels work.. sorta. And their relevant specs. For this the typical 20W 12V aluminum framed panel is use the focus. This is a good size for smaller batteries in the 8Ah to 12Ah range and

Yes, over 45 years of electronics engineering and multiple disciplines related. Also experienced with the many and varied Lithium chemistries and forms. That helps me as I am an avid electronics exper

Resistance in series with L4 will upset the tuning and maybe lower power. It will definately take the finals out of class E, not suggested. One way is to isolate the DC feed to Q6 and run that voltage

#qcx #supply

Complain all you want the only ones that can do that is ARRL the publisher. They can change it and you can't. That and it was written a few years back. Its old news. As to velocity or propagation on 4

#antenna #qrp-dx

The End fed zepp is nothing special and the "phasing section" is not. Its a quarter wave transformer to feed the high impedance end of the half wave wire (one leg). Performance save for feed point con

#antenna #qrp-dx

On average its asked once every 6 weeks. You may find #31 a bit fine for handling. However wit will work otherwise. Yu may have to trim off a turn depending. Allison ------------------------------- Pl