[ARC5] ARC-5 transmitter frequency drift suggestion

[Kenneth G. Gordon]

One aspect (possibly the most important aspect) of this 
question I have not seen mentioned here is the power 
input/output at which one attempts to run these 
transmitters.

If you will remember the data plates that were attached to 
some versions of the "ARC-5" you will notice that they read 
"A1 output 12 watts"

According to the series of articles in ER magazine, the 
author ran the units he tested for drift at a maximum power 
output of about 15 watts.

The results of his drift measurements were quite 
impressive,and I wish I could list those here. I will try to dig 
out my issues of ER and post them asap.

I know that in many cases, those who used the "ARC-5" 
transmitters alone were attempting to run them at 150 watts 
input, fully plate modulated, and then they complained 
about drift.

BAD drift should have been expected under such 
circumstances.

As has been said here by some of us: when these 
transmitters are run according to original specifications, drift 
is minimal, no matter how long one keeps the key down.

One other thing that was mentioned in the series of ER 
articles: drift in a VFO is not determined so much by the 
TYPE of oscillator circuit as it is by the quality of 
components, and the quality of the construction.

Ken Gordon W7EKB