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Dan Quite possibly they have gone forever. I suspect that this group is setup to delete old attachments so data storage is not exceeded. The way to do it is to save anything you think is useful. Easy

I believe the correct way to look at it is the FWD power plus REV power at the finals. So, with the example above, 5 watts plus 1.25 watts is 25Vp and 50Vpp, approaching the 60V drain-source

Hans, thanks for that. So, it seems my assembly went well.? Again. Pure pleasure.? I will check the links of Claudio ASAP. Congrats for the ingenuine construction of the QDX and PA.? (and for the

That is a question I've been trying to answer myself. According to a video from Rhode and Shwarz, at 3:1 VSWR, a quarter of the power is reflected back toward the source. So if the QDX has a forward

When I go back and look at old messages, I can't see the attachments. Any tricks I'm missing? -- 73, Dan? NM3A

Randy, Problem with that approach is heat. Putting the regulator on the PCB foes not allow for much heat diffusion to environment. But here's a solution for you. Look at msg #79293 where I explained

-- 73, Dan? NM3A

Ah, close but not quite Piss ON EVERYthing, tomorrow is Saturday Right up there with TGIF & OHIM That's my story & I'm sticking to it 73 y'all

I am using a DC to DC Buck/Boost converter to drop my voltage from 14.3 battery pack to 9V DC and

I would look at the schematic for the Elecraft K2 and see what they did. Ed AB8DF

Daimon, Fundamentally it is your choice. Do you want the best possible performance from your build or do you compromise? The RX will probably perform reasonably well with just an LPF as filter. That

Mark, Get your cataracts removed first…. What a difference in vision, especially for building and color vision. And cheap readers will work for any range of work you need. Dave K8WPE David J.

Folks, I am building an all-band HF CW transceiver. I am using a self-modified code version of the Sudden VFO (GQRP Club), and a QRPLabs 10w PA and QRPLabs Receiver module with Polyphase kit. The rig

I saw your post on Facebook last night. Congratulations!!!

Hans, I've been wondering this for a while.?What would you consider "really badly mismatched" with respect to the QDX SWR? 3:1? 2:1? 1.5:1? I have a WSPRlite with, I assume, no VSWR protection. They

Hi Bojan There is a lot of interesting information and measurements on 1N4007 "PIN diodes" at Claudio IN3OTD's page: https://www.qsl.net/i/in3otd//electronics/PIN_diodes/PIN_diodes.html And

I did the same as W0ITT and realized a Z-match tuner with the chinese kit, too. I just added a couple of 250pF and 500pF extra capacitors and a three ways switch to switch them in when needed. It

p.s.? At the same time a 9 volt regulator could be implemented on the PCB for a desirable one board solution.? The qdx running at 9 volts would be much cooler overall. Hans anything you would be

TI and others make eFuse ICs which can trip in microseconds and whose trip current is set with a single resistor.? Some have under- and/or over-voltage inhibit and soft start capabilities.? I use

After killing 2 BS170s and Q7 on a 13.8V supply I am sticking with 12V until I feel like taking a risk. (Built for 12V, <1.3:1 SWR when the smoke came out.) Enjoy your new rig! 73, Scott N1AIA