[R-390] 7 Meg low sensitivity

[Craig C. Heaton]

Keith,

Tell us more. Lower sensitivity on the 7 meg band vs 6 & 8, how much less?
Can your sig-gen measure the output? How are you connecting the sig-gen?

Good double peaks on the crystal trimmer, are you getting double peaks on
the trimmer caps for the 4 to 8 meg bands? The position of the slugs in the
racks can be a clue. Are any of the bristol adjustment widgets way higher or
way lower than others in the RF deck?

The reason I'm asking about the slug positions; the sensitivity on one of my
R-390/A's was low on the broadcast band 0.5 to 1 meg. One slug was real low
in the rack, almost falling out. The cure was to replace the silver mica
caps in that coil assemble.

Craig,

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Keith Densmore
Sent: Saturday, July 28, 2007 8:38 AM
To: r-390 at mailman.qth.net
Subject: [R-390] 7 Meg low sensitivity


I have two R-390A's that exhibit the same problem--
lower sensitivity on the 7 meg band but 6 and 8 are fine, as are all others.
Good double peak on the crystal trimmer, and all other alignment issues seem
fine.
There might have been a previous thread  on this, anyone remember year and
month?

Thanks, 73,
Keith

_____________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/faq.htm
Post: mailto:R-390 at mailman.qth.net
Unsubscribe: http://mailman.qth.net/mailman/options/r-390