开云体育

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

Just a tip -- I had a PSU from a Dell laptop laying around. 19.5 V at 4.62 A max (90 W). I wired it to the 50 W PA and it seems to be working just fine. PA on 20 m draws around 3 A (60 W) and peak

Jim, I picked up the Haako FA-400 smoke absorber.? I've certainly inhaled enough solder in my life, but now with COPD stage 3 I really must make the effort to keep anything unlike air out of my

Tnx, Evan. Guess I depend too much upon pictures :0) 72 / 73, Bill, N4QA

Hi Bill, Hans did not update the pictures in the manual.? The operation of the PTT is covered in the Terminal program explanation starting on page 14, topic 4.2, with the details on the PTT (and