Going into transmit, C 63 should pass a big transient through C 50 into Q 70 base which still has power because nothing quickly discharges C52, and U1 always has power. ?
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On Dec 20, 2017, at 20:14, John Seboldt K0JD <
k0jd-l@...> wrote:
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I found the same thing with a straight key, decent performance with a paddle. Yes, the pops going into transmit are a bit annoying. Perhaps a simple transistor switch to break the audio connection could be a mod to pursue - the KK7B R1 and R2 circuits used
a 2N7000 transistor for this. A little research into the cause will probably find a cure.
Pretty amazed with it as it is - haywired it on the table and it's working pretty well. Operation is intuitive. However, I can't get the CW tone to change - hitting PTT doesn't seem to set it as the screen says. So I can't move that yet.
John K0JD
Milwaukee, WI
On 12/20/2017 15:41, Jim Sheldon wrote:
Definitely a loud POP in both the headphones or a speaker if plugged in.? It is very annoying and occurs on both the PTT keying transition and on the first dot of the CW keying transition.?
Also, the paddles are very difficult to send CW with as the keyer chops the first dot and the timing is NOT consistent between the dot and dash transitions in the keyer.? I've been a mostly CW operator for over 50 years and this rig will not meet my specs
as a CW rig until that is fixed.? Also the hand key doesn't always key right either.? I polished the paddle contacts and the hand key contacts til they were squeaky clean.? They work perfectly with my Elecraft K3S giving no errors (that I don't make myself)
in keying so they should do well with this rig too, but they don't.? The hand key occasionally will trigger the keyer into dots or dashes when first pressed.?
I did put the 4.7K pull up resistor right on the Raduino rather than on the key jack but that shouldn't affect the voltage divider operation if the software is working like is should. I actually added a separate paddle jack because I do not want to modify my
Begali paddles by putting resistors in line.? That would lock them to just the uBITX and I'd be unable to use them with any other rig.
Jim Sheldon, W0EB
Park City KS
PS:? my uBITX made it's first QSO this morning on 40 meter SSB.? 7200KHz from KS to Tennessee on a very low mounted end fed Zepp antenna.? Signal report was 4-4 in QSB but we completed the QSO.? Hoping I can make a CW QSO now, but it's going to be tricky with
the keying malfunctioning.? (I did check all wiring and it's good).?
