one more thing. On r-66 if i turn it to the right all the way,full on , its like a vibrating sound. and no current on c-16 right side. C-14 and C-18 do nothing. Bad solder spot some where?
"Vibrating sound" out of the BITX or your big rig?
R66 and C65 control the Balanced Modulator.
They should be alternately adjusted while transmitting with
NO audio input. Then listen for that signal on your
"big rig" and adjust for minimum
received RF signal.I would solve the receive problem first.
If neither C14 nor C18 do anything I would check
ALL the solder connections in that area (The RCV and
XMIT RF Filter Circuit). especially check the solder connections
from the wires to boards for toroid inductors L4 and L6.
If you don't get all the insulation off of the enameled wire
there is often no, or a poor, connection. You can try reheating
these inductor wire connection. But if the enamel is still on
the wire as it goes into or out of the solder connection,
there is probably no connection. If the enamel wire looks like
it is sitting in a pool of solder, with no solder wicking up the
sides of the wire, that is a bad sign.
From the symptoms you describe, if the rig uses a conventional tuning capacitor, I'd guess that the shaft side of it is not properly connected to ground.
The BITX uses an off board Polyvaricon for tuning, whose center lead is
to Ground. I would check to make sure this is well connected.
In the kit is a white plastic spacer and screw to extend the
center "control" of the Polyvaricon, which is a short metal
affair. I would get that extension and a knob on there to
cancel out any effects from touching metal in an RF circuit.
(And when you get the BITX working get rid of that damn
cheap one turn Polyvaricon and do the Varicap Ten Turn Pot
Tuning Mod. It will save you a world of headaches and uses
about 5 parts.
The mod is described on KC0WOX's site
and many others.MOST OF ALL:
I would check out ALL of Lonnie's(KC0WOX) BITX20A
Assembly and Troubleshooting videos:http://golddredgervideo.com/kc0wox/bitx20a.htm
73 and Good Luck!The BITX20A is a spiffy rig when you get it going!