[AMRadio] DX-100B Low Output on 15 and 10 Meters


Mark Bell bell at blazenet.net
Sun Oct 17 22:11:54 EDT 2004


Folks --

I'm getting low output on 10 and 15 Meters.  Typical output on the other
lower bands is well over 100 Watts.

All tubes test good, and I re-did the Buffer Coil adjustments as per the
manual.

After tune up on 15 Meters, here's my readings:

Driver current is at 6 ma
Ig is at 2 ma
Ip is 250 ma
Output power 50 W

After tune up on 10 Meters, my readings are:

Driver current is at 6 ma
Ig is at 2 ma
Ip is 250 ma
Output power 65 W

As a reference, after tune up on 20 meters, my readings are

Driver current is at 6 ma
Ig is at 6.5 ma
Ip is 250 ma
Output power 130 W

Just for "fun",  on both 15 and 10,  I upped the driver current to max,
which was 10 and 7 mA respectively.  The respecitve Ig's were 10+ and 5 mA,
and the output power (both bands) jumped to 80W.

So, seems I have a problem with the grid current on 10 and 15 M.  I figure
I'd start looking at the circuit around the Driver section of the
bandswitch.   I was wondering, though, is this a known problem with the
DX-100B that might be attributed to (perhaps) neutralization?

Any and all comments welcome.

Thanks & 73

Mark K3MSB




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