[Heathkit] HW-101: Nothing on 15 meters

[Kenneth G. Gordon]

On 1 Jul 2006 at 15:55, James Austin wrote:

> It does not receive any signals and the calibration oscillator is
> barely audible. Adjusting the driver/preselector does not affect the
> volume of the calibration oscillator, like on other bands.

First of all, you cannot align 15 meters, without aligning 10 meters 
first...and 80 meters before that. See your manual.

> Does anyone have any tips on where to start troubleshooting this?

I would go through the entire alignment procedure, with the exception of 
adjusting the driver/preselector coils for maximum output in the 
TRANSMIT mode, rather than the receive mode as the manual tells 
you. 

You have to be sure to dip the final, and only use enough drive to get 
an indication on the output meter.

Your heterodyne oscillator coil for 15 meters is probably out of 
alignment...or the 15 meter heterodyne oscillator crystal may be bad.

There is a test point on one of the boards to hook a meter to for testing 
the output of the heterodyne oscillators on each band. You should try to 
set each one for as close to 2 volts as you can get them. You have to 
"approach" that value from one direction, only,  of the movement of the 
heterodyne oscillator coil slugs. The manual will give details.

To test if the heterodyne oscillator is at fault, hook a DC voltmeter to 
the test point mentioned above and check the voltage on each band.

Unless the rig has been aligned recently, the voltages will probably 
vary all over the map, but if any is missing, then either that one is so far 
out of alignment that there is no output, or the crystal is bad.

The output could also be on the wrong frequency too if the alignment is 
far enough off.

Ken Gordon W7EKB