[ARC5] Modeling the PA stage

[WA5CAB at cs.com]

Ian,

That's why the antenna relay unit (RE-2/ARC-5. BC-442-A, etc.) has a fixed 
vacuum capacitor mounted under the bottom of it.

And BTW, BC-442-AM is so marked (with the "M") because it has had that 
capacitor and its mounting plates removed.  The manual explains what to do about it 
but doesn't explain why they did it.

In a message dated 4/10/2006 9:46:54 AM Central Daylight Time, 
ianmwilson at earthlink.net writes: 
> Mike et al,
> 
> Excellent information, thank you!
> 
> The Aircraft Antenna Design article - only the first page loads when I try
> to look at it. Broken links maybe?
> 
> I notice that for large planes (assume that ARC-5's, often being used aboard
> bombers, would be designed for this service), the quarter-wavelength
> frequency would be under 5MHz. Doesn't this mean that at 7MHz, a typical
> antenna would look like a few ohms in series with an inductive (not
> capacitive) component?
> 
> Must go and dig out a few books, thank you all for the info.
> 
> 73, ian K3IMW

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)