[Hammarlund] Collins or Hammarlund?

[Glen Zook]

The SP-600 is, as are most Hammarlund receivers,
stable enough for most AM operation.  But, when you
try to use them on SSB or CW, that is where the
drifting problems come in.  When crystal controlled
(like with the JX-17, etc., models), when using the
crystal they are very stable.  It is just when tuning
"normally" that the drift occurs.  The drift is much
worse on the higher bands.  The lower the band range,
the more stable the receiver is.

There are individual exceptions, and some particular
receivers are more stable than others (due to
component tolerances most often).  But, it has been my
experience that a large number of the Hammarlund
receivers do tend to drift.  Of course, the same can
be said for quite a number of other manufacturers'
receivers including many models made by Hallicrafters,
National, etc.

Frankly, I have a number of "shortwave" band receivers
from the 1930s that you can let warm up for about 30
minutes and then tune in a broadcast station (on
"shortwave") and the receiver is stable enough to hold
the frequency.  However, I wouldn't even try to use
them on CW or SSB if they did have a BFO.

Glen, K9STH


--- "Ray, W2EC" <w2ec@attglobal.net> wrote:

I can power up the SP-600, dial in a known BC
frequency on the vernier setting, and listen all day
without touching the dial again.



=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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