[TenTec] Argonaut 505 question

[Al Gulseth]

(Reminded by the "Restringing the Model 200 VFO" thread)

Looking for the "department of antiquities" here: my 505's dial calibration is 
off, all bands. According to the manual everything derives/multiplies from 
the PTO. While the amount varies by band, when the PTO fundamental frequency 
is taken into consideration, it's surprisingly consistent. Here are some 
approximate numbers for the "0" and "500" dial marks I came up with 
by "sniffing" the PTO fundamental with a small digital SW portable:

Band	VFO low	VFO high	Meas low	Meas high	Diff L KHz	Diff H KHz
80	6.250	6.500	6.234	6.484	-16	-16
40	5.333	5.500	5.318	5.485	-15	-15
20	5.000	5.500	4.987	5.480	-13	-20
15	6.000	6.250	5.980	6.234	-20	-16
10	6.333	7.000	6.314	6.988	-19	-12

I'm guessing that a cap or something in the PTO circuit may have changed 
value. From the manual, it appears that an across the board oscillator 
realignment is probably needed - no quicker way? I hadn't tried to do 
anything with it to this point as the 505 mostly just functions as a RX for 
casual listening on the bands, and I've somewhat learned to interpolate to 
find where I want to be.

Otherwise, if someone out there is nostalgic for a 505, I'd be willing to 
consider letting it find a new home as I probably won't get around to doing 
anything with it in the forseeable future. Like many other Americans, I 
probably have way too many projects and too much "stuff" (but I digress....)

TNX/73, Al