In a message dated 1/12/2006 9:08:57 PM Central Standard Time,
k4nau@comcast.net writes:
> . I don't understand the "wrap around" scale on the Band Switch. It reads
> 160-80-40-20-15 from left to right, then on the lower scale, it reads
> 24-16-10-6.5 in the opposite direction, ending with the 6.5 between 40 and
> 80????? There are only detents in the switch for the upper bands &the lower
> ones are positioned "in-between" the standard positions
Butch:
The UPPER numbers in the arc are BAND numbers whereas the numbers in the
lower arc are FREQUENCY numbers. For example, the amp is capable of operation
on
30 meters as well as in other ham bands. But wait, where is 30 meters?? 30
meters is the same as 10 MHz in the lower arc. So, you can see if 40 meters is
appx. 7 MHz and 20 meters is appx. 14 MHz, it only makes sense that 30 meters
or 10 MHz would be somewhere in between the two!
For sake of conversation/explaination..............
That's right, there is not a detent for 30 M/10MHz (+other HF bands) but you
can look for a dip in plate current between by either placing the BANDSWITCH
on 20 or 40 M (try 40M first).
This same logic applies to the PLATE control. Let's say you are trying to
tune up on 30M / 10 MHz, where would you expect the PLATE control to be when
the
plate current dips?...........between 40M and 20M??...............YES
Trust that explains it for you.............suggest you place the amp on a
dummy load and "look" for some of the OTHER "missing" band detent positions
and
then it will start to make more sense to you.
GL and don't let the smoke out !!
Val
W5PUT
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