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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

Could a TT PSU schematic serve as a template? MyModel 979?? (5A adjustable) still works fine with my Century 22. Michael UK 2E0IHW

Perhaps a one chip current limiter like the STM STC1C - relatively low voltage drop and adjustable current limit. $#2.96 + a few other parts. I didn't do a careful search but this shows the concept.

1_04C ops manual shows only three connections to QDX ver 3 but rear panel in my kit shows four connections. My rear panel has a hole for PTT but no PTT shown in ops manual. OK guys, what am I missing

Some kind of foldback solid state (fast) current limit? 73, Willie N1JBJ

Limiting the current is in excellent and efficient way to protect the finals. TenTec did this for years with their power supplies.? A 20 amp power supply would trip out at 20.2 amps and super fast.?

And don't forget PISS OFF! Meaning leave me alone, don't bother me, get out of my sight, get away from me.

This is the problem with cross pond translation ? Piss off early = go home early, nothing to do with being angry etc UK & US two countries separated by a common language ? Peter M0PWX M0PWX

Hi Steve, thanks for the link.? Nice video of Ian.? I have also checked all that test points to be sure the T/R switching is doing well as on RX as well as on TX. What I miss is the value of the

It's interesting to see the and understand the linguistic diferences in different parts of the world. To be "pissed" (US) = feeling angry. But in the UK or Aus it means being unduly influenced by

Hi Colin Firstly, are you correctly referring to image rejection (the superhet image 24kHz away from the wanted signal) and if so, how are you measuring that? Or are you referring to unwanted sideband

Hi, Peter Since the first 2 words mean "get angry" on this side of the pond, rather than "leave", over here the second and third words are "On Everything". 73 Jim W4JED

Hi Ken, Unless you are in the directory where those files (/qdx_ui_103.py/ and /qdx_sdr.py/) reside you'll have to use a full path name, such as sudo chmod +x /home/pi/qdxsdr/qdx_ui_103.py.

Bob It is push-pull so 2 would probably be better. But the LPF switching would have to be changed or removed, 1N4007s are unlikely to be loss- free at 60MHz. 73 Alan G4ZFQ

American hams/former CBers will understand this. When 4 watts isn't enough, GET AN AMPLIFIER. FWIW there are still loads of CB amps floating around, and some of them still work. Even if you get one