[Elecraft] Troubleshooting

[Masleid, Michael A.]

Hello Gregg

> I've got a constant full AGC and signal strength action in either =
mode.

So the AGC is pushing the gain down - the receiver is quite?
Does the RF gain control do anything when AGC is off? =20

> The output of U1 on pin 4 is 7.6 volts when on and 7.3 when off

Voltage should be 6.9 give or take .69, so up to 7.59 is OK.  Since this =

is a Gilbert Cell mixer, swithcing pin 2 to DC to swamp the IF signal =
into
pin 1 of the mixer might not change the DC output by much.  The AC =
signal
on pin 4 is what is important, but this might be hard to measure.  I =
think
the AC gain through U2B is about 20, so perhaps look for AC at U2B pin =
7.
This should be noise, centered about 150 kHz.  It should have no AC when
the AGC is off.  If there is a whole lot of 5.068 MHz there, then the
NE602 is toast. =20

> ...sorta sounds like the NE602 is bad....what you guys say???

Not enough proof yet to convict.

73, Michael, AB9GV