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I've just finished the tests up through 20 meters and it's only 40 that I have any issues with. Test parameters - since the power output gets lower the higher in frequency you go, on each band I set

Thanks, Jim for doing those tests!! Sorry to hear the 3rd wasn't reduced any further. In my tests of the external daughterboard idea, the 3rd harmonic on that particular band was reduced by 1.5 S

OK peeps, I measured the harmonics with my spectrum analyzer. I can only show the fundamental, 2nd and 3rd harmonic so it's not a complete test, but the results though positive, are not all that

Gary, I would think that the various coil "sensitivity" options (power) would affect power consumption (at 12V, about 13mA to 38mA per relay)? and operating speed ? which may be something to consider

Arv, A good friend of mine, Ben Bibb, NO5K, said his analysis shows it is a difference in the INDUCTANCE of the relay contacts because these are really "Constant K" filters and they are notorious for

Hello It appears that asking a question on the Internet is the best way to embarrass yourself. I replaced Q13 with a through hole 2N3904 and that did not resolve the problem.? I then took the build

It would be cool if someone with a S.A. could prove / disprove the coupling theory, by testing the 400mA, 200mA, 150mA versions of the AXICOM P2 Relay Series :) They are all the same maximum coupling

Farhan jee, I suppose it is "Axicom" and not axion. regards sarma vu3zmv

Guys, If someone else too can confirm this fix. We will start ordering axion relays from now on. - f

Yup, and after opening up one of the original relays that I removed from a V4 board in prep for putting new ones on (they should be here within the hour) it was extremely obvious that those relays

See post? ?/g/BITX20/message/44278 for code to correctly compensate for an variation in the center of the 12mhz and 45mhz filters. Also

Jim Sorry for the "blindly changing relays" comment. That was not intended to be derogatorily in any way. Thinking when I said that was about those who follow what we say, assuming that we have

Arv and others, #1 I really believe it's capacitive coupling within the relay itself and between the contacts, as well as from contacts to coil. The original relays in the uBITX are inexpensive (read

On Mon, Oct 8, 2018 at 07:34 PM, Dr. Flywheel wrote: > > Individual component behavior can vary circuit response curve. This is a > known fact and a proper design typically includes measures to

Kees, and others.... Blindly changing relays may fix the problem, but are we missing something here? What is the real problem with the original relays? Is it capacitive coupling between RF carrying

I like this, but... looks like you left C215 in but took C211 out of the circuit, does it matter? Maybe not.. are you sure they are Murata? Are they shielded? Probably not exactly 1206, maybe 1210.

When did Arrow start the free shipping? Last time I ordered from them, a couple of molex connectors - male and female, they charged me a couple of bucks each for the connectors, plus $18 shipping. But

Mike, this works fine without bending too much to fit. I put them where I thought the issue would be fixed. The 0.1uFs are redundant as there is no DC around that area. Raj

Good job, Raj! That's looking like a very easy spur fix. The 680nH inductors in your photo are larger than the adjacent 1206 parts in your photo. But I'd bet 1206 inductors will do just fine. Your

Nice work Raj.? Looking at the photo it appears that you have the L7 smt coil connected between T4 and Y1, eliminating C211.? Is this correct or should the replacement coil connect between T4 and