[Heathkit] HW-101: Nothing on 15 meters

[wa3fiy at radioadv.com]

I wonder if that was a common problem?  I have a SB-301 and SB-401 and 
both have "dead" crystals on 15 meters.

-Lee-

On 2 Jul 2006 at 14:10, James Austin wrote:

>  
> Thanks for the tips everyone.
> 
> The heterodyne oscillator is not working on 15m. The voltage on the test
> point is about 1.5 on all bands except 15m where it is .1, adjusting the
> coil does not change this voltage.
> 
> Jim KA2RVO
> 
> -----Original Message-----
> From: Kenneth G. Gordon [mailto:kgordon2006 at verizon.net] 
> Sent: Saturday, July 01, 2006 4:29 PM
> To: James Austin
> Cc: Heathkit at mailman.qth.net
> Subject: Re: [Heathkit] HW-101: Nothing on 15 meters
> 
> 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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