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 say I am spotting the signal, let me explain...
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 ??
NA1MH
I'm having the same problem here. It seemed that I
initially had the two heterodynes as described--
without doing any regen. trimmer- cap c30 or tuner-
coil winding adjustments-- but then-- for some unknown
reason, after putting the front panel on, I lost this
SPOTTING capability and could only tune in my own
signal ( in receive position) listening to "tuning
little beeps" to settle in on the Xtal frequency. The
nice solid, twin heterodynes on either side of my
signal HAD DISAPPEARED and I could not get them back!
:(
I am getting close to
resigning myself to marking the dial according to
where another Xmtr shows my 7.030 frequency to be on
the BJ-1.
Any further suggestions
from anybody will be appreciated. I like things to
work the way they should-- my downfall!
73's/72's from Rick, W B 3
B I Q
Sent from my iPad
Is there a way to tame down the spotting
issue?
Even with full attenuation and
regeneration cut entirely down, it is still
difficult to spot you crystals. I have ended
up -- not at all convenient -- hooking up my
Yaesu VR-500 "DC to Daylight" radio and
setting it to my crystal frequency, then
setting regeneration up and adjusting the dial
to hit the setting of the radio. I've marked
the points on the dial with dots of yellow
paint, but re-setting to a value seems to be
problematic.
Any suggestions?
Success will depend on somebody answering
my CQ and being willing to be a tad off. I
have had people take me to task when using my
KN-Q7A SSB rig, which has a VXO, and not being
able to exactly come on frequency. They don't
seem to know about using an RIT....
73 /paul W3FIS
--
David Martin - NA1MH - Mountain Home, Ar.
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