[R-390] Interesting Finding... R-390A

[Michael Melland]

This is interesting.... here is an unusual finding on an R-390A.

Radio works fine.... a quick check for operational condition "sensitivity"
(per manual... cal on, antenna peaked on each band and carrier meter to read
no less than 40 dB at each 100 KC cal point) reveals excellent sensitivity
but an anomoly on one band.  3 MC reads strangely.... carrier meter readings
vary exactly 20 dB each 100 KC calibration point.  The odd frequencies read
20 dB lower then the even freqs. Interestingly, 2 MC and 20 MC (share same
cans/crystal I think) read normally up and down the scale (65 dB+/- all 100
KC points).

See below..... any thoughts ?

The 3 MC band exhibits the following readings:

3100  - 50
3200  - 60
3300  - 40
3400  - 60
3500  - 40
3600  - 60
3700  - 40
3800  - 60
3900  - 40
+0000 - 60
--
Michael Melland, W9WIS
Winneconne, Wisconsin USA EN54pc
qrp-l #1656 - qrparci # 9875 - iparc #252
ars #1075  -  http://webpages.charter.net/w9wis/