Re: [BayouJumper] Spotting problem
David Martin <davemrtn@...>
I have been experimenting with mine today.
First thing I did was change R17, in the Tx circuit, from 1K to 6.8K in an attempt to lower the output of the spotting signal, assuming the R17 & D1 were still allowing Q4 to contribute to the spotting signal.
That seemed to help me since my Bayou Jumper was all over the dial (end to end) when trying to 'Spot'.
While turning the tuning control in the 'Spot' mode, my tuning control sounds very 'scratchy', but not while in normal receive mode.
I noticed on the receiver schematic the audio output from Q3 was going through a C9 to the wiper on the volume control. My personal preference is NOT to do it that way. So I changed that circuit so C9 feeds the high side of the volume control and the wiper feeds C13 going to the IC audio amp.
Now with Regen at minimum, Atten at maximum and Volume at a
comfortable level (just barely turned up), I can spot the signal
(somewhat), but the tuning control still sounds scratchy.
I am using my FT-817 to to determine what is what.
With the Bayou Jumper key down for spotting, I can "spot" the signal on the Bayou Jumper, and the FT-817 says the transmit frequency is approx 7.29MHz (using the 7030 crystal).
Releasing the Bayou Jumper key, I then tune the FT-817 to see where the regen oscillator is. No matter what I do the Regen oscillator always comes out about 20KHz higher than the Crystal frequency.
I would expect the regen freq to not be dead on the crystal frequency, but not off by 20KHz.
What am I missing here ??
On 1/9/2017 12:31, Rick Nelson laseraddict777@... [BayouJumper] wrote:
-- David Martin - NA1MH - Mountain Home, Ar. -----------------------------------------