[Heathkit] HW-101: Nothing on 15 meters

[Bwana Bob]

I saw a similar thing with an HW-100 I'm restoring for a friend. The 
heterodyne oscillator wouldn't run on 80m, due to component and crystal 
aging. I just started adjusting the slug, until, "bloop", it started 
oscillating. Also look for the usual suspects: cracked solder joints due 
to age.

			73,

			Bob WB2VUF

Kenneth G. Gordon wrote:
> 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
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