HW-29 and HW-29A
 

Can anyone please explain the difference(s) if any, between
the two Heathkit "Sixer" models HW-29 and HW-29A?

HW-29 and HW-29A
 

Thermion wrote:
Can anyone please explain the difference(s) if any, between
the two Heathkit "Sixer" models HW-29 and HW-29A?

The HW-29A used 8-MHz crystals for the transmitter, and multiplied the
oscillator frequency by 6 (so that 8.333 MHz crystals transmitted on 50
MHz) -- the 8 MHz crystals were readily available surplus at that time.
The earlier HW-29 which came out around 1960 used more-expensive
_overtone_ crystals -- in which the crystal was actually made to operate
at a multiple of it's basic frequency. Since the 8 MHz FT-243 crystals
were so cheap, many, if not all, the HW-29s were modified to take them,
and Heath quickly figured it out.

Northe
N6KO

HW-29 and HW-29A
 

"Northe" wrote in message
...
Thermion wrote:
Can anyone please explain the difference(s) if any, between
the two Heathkit "Sixer" models HW-29 and HW-29A?

The HW-29A used 8-MHz crystals for the transmitter, and multiplied the
oscillator frequency by 6 (so that 8.333 MHz crystals transmitted on 50
MHz) -- the 8 MHz crystals were readily available surplus at that time.
The earlier HW-29 which came out around 1960 used more-expensive
_overtone_ crystals -- in which the crystal was actually made to operate
at a multiple of it's basic frequency. Since the 8 MHz FT-243 crystals
were so cheap, many, if not all, the HW-29s were modified to take them,
and Heath quickly figured it out.

Northe
N6KO

Many thanks!

HW-29 and HW-29A
 

In article ,
Northe wrote:

Since the 8 MHz FT-243 crystals
were so cheap, many, if not all, the HW-29s were modified to take them,
and Heath quickly figured it out.

Heath produced a mod kit for the original HW-29, to add an 8 MHz
oscillator. As I recall, it was built on a bracket mounted using the
two holes on the front panel that originally held the plastic Heath logo.

I obtained a used Heath CB model similar to the Tener, and converted it
to a Sixer. I home-brewed the 8 MHz oscillator.

This was back in the 60s when the band was wide open. I did not have
the capability of measuring RF power, but would guess my makeshift
version of the Sixer put out about one watt.

Fred
K4DII