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That was my gut feeling, figured I'd best back it up somehow. Let's assume the IRF510's tab is 1/2" by 1/2", the insulating material is 0.003" thick, and the relatively permitivity of that insulator

Mike You should be able to see this in the gallery now ... at the bottom of the list. I am still trying to figure out how to get these alpha order by callsign! Mike ZL1AXG -- Mike

Hello Vic, It could be a casting issue. Just in case see the definitions below of the special characters arrays in the uBitx software. The S meter bars using re-defined characters work fine on my

Not a problem. Impedance from drain to ground is quite low, my guess is the push-pull output transformer gives it 12.5 ohms because the center of the primary is effectively at ground.? (Some push

Surefire way to reduce any chance of that would be to bond the heatsink well to RF ground on the board. Paul ZS2OE

This may have been answered already. The mounting tab on the IRF510 is internally connected to the DRAIN which is the output of the transistor (connected to the output transformer). Therefore would it

Hello all, Congratulations Mike, fantastic your uBitx. 73 Saulo PY7EG 2018-03-23 11:58 GMT-03:00 <Mharpen@...>:

A speaker, an L/C circuit, and a spring are all very much the same as far as resonance. Even a pendulum has some resemblance to a resonant circuit in how it responds to a step function. We used to

With no relays energized as shown in the uBitx schematic, RF power from the finals goes through KT1-14 to the 30m lowpass filter then through KT1-3 out to the antenna. That's as short as it can

Jerry, Thanks for the reply. Can you explain how this bandswitch method affects the length of the traces on the upper bands? Thanks Mike M. KU4QO jgaffke@...> wrote:

You might check Amazon as well. They have multi conductor (from 2 on up) 26 and 28 gauge shielded guitar control cable available in various lengths from 1 meter up. I happened to see some there when

That Hammond 1455T1601BK?extruded aluminum box?should just barely accept the uBitx without rotating the board.??http://www.hammondmfg.com/1455.htm Box can accept a 6.318" wide board if you use

The vendor is fan_computer. Use underscore not dash to search eBay! Roy WA0YMH

Mine, you did a very nice job! What is that case? Thanks, Roy WA0YMH

Hello Karl, thanks for your interest. The outside dimensions are 203x144x68 mm, inside 5.5x7.8 in. The PCB slides into grooves in the sides of case, no stand-offs needed. The case is sold on eBay for

Have you tried RG174? It's RF, not audio cable, but is thin, shielded and should work just fine. Finding a small length might be a problem though.

This wiring scheme is often used for bandswitching relays, keeps the traces short as possible for the upper bands. ? ??https://www.w6pql.com/a_1.5kw_lpf_for_160-6m.htm

Yes, very nice. Looks like a Hammond 1455T1601BK:??http://www.hammondmfg.com/1455.htm Main board rotated 90 degrees, display on a wiring harness.

Mike, this is a very interesting approach. How big is your case? I like how compact it all is. -- Karl Heinz - K5KHK

Hello Mike, Here are some pictures of my uBITX build. Thanks for looking. Mike N6CMY