DX-100B Problems

[Michael Waldrop]

The DX-100's VFO operates on 3 separate frequencies, 1.750 to 2.000Mhz,
7.000 to 7.425Mhz, and 6.740 to 6.807.5Mhz, depending on the band switch
position. The 1.750 to 2.000Mhz is for 160 and 80 meters, 7.000 to 7.425Mhz
is for 40 and above, excluding 11 meters, and 6.740 to 7.807.5Mhz is
for 11 meters.

I would check the oscillator and driver band switch for broken wires
or bad switch contacts. I would also check for the 3 different
VFO frequencies depending on the band switch position. If the 6 and 7Mhz
signals are not there you will have no output on 40 and above.

You might also check the 6AQ5 clamp tube adjustment to ensure the
final tubes are cut off when the driver control is set to zero.



73's
Mike
W5RKL








On Sat, 5 Jan 2008 12:18:22 -0800, Mike Hardie <mike46 at SHAW.CA> wrote:

>My DX-100B has never run as per the manual from the start when I bought it
>second hand.
>
>Using the CW mode  160M and 80M operate normally. On 40M the driver current
>won't go below 10 ma, even with the control set at zero. (Very brief key
>down)  On 20M and higher the driver current behavior is the same as 40M, but
>there's no current through the finals, and of course no output.  I've tried
>different makes of 6146 tubes (no letter) and done the usual wiring and tube
>checks.
>
>Has anyone else experienced this?
>
>Mike VE7MMH
>
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