No subject

"SERVICING PROCEDURE FOR MOTORBOATING



Motorboating is a defect in a receiver that results in a put-put noise
similar to the ex­haust of a motorboat. The most common cause for
motorboating is an open output filter ca­pacitor in the power supply.
The only other common cause is an open grid circuit in any of the stages
of the receiver.  A servicing procedure for this defect in a re­ceiver
is to bridge the output filter capacitor in the power supply with a test
capacitor of similar capacitance and to see if the trouble is
eliminated. If this proves ineffective, the technician proceeds to make
an ohmmeter check of all grid circuits, looking for an open. In this
regard, it should be remembered that agc decoupling filter resistors are
part of their grid circuits. They must not be overlooked, even though
they rarely open. The most com­mon opens occur in the grid-load
resistors of the first and second a-f stages."



Hope this helps.



73,

Ken K4XL
k4xl at arrl.net
*** BoatAnchor Manual Archive ***
On the web at http://bama.sbc.edu or
FTP site info: bama.sbc.edu login: anonymous p/w: youremailadr


----- Original Message -----
From: "DAN COTSIRILOS" <dcsfree at worldnet.att.net>
To: <hallicrafters at mailman.qth.net>
Sent: Thursday, September 19, 2002 1:43 PM
Subject: [Hallicrafters] SX-122 HELPPPPPPPPPP


I WAS ALIGNING THE 50KC IF AND REMOVED V3 AS THEY SUGGESTED AFTER I WAS
DONE I PUT BACK THE TUBE TURNED THE RADIO BACK ON AND NOW I GET LOUD
MOTOR-BOATING AND DISTORTED AUDIO. DOES ANYONE HAVE ANY IDEA WHAT COULD
OF HAPPENED.  DAN


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---
_______________________________________________
List Administrator: Duane Fischer, W8DBF **for assistance**
dfischer at usol.com
----
Hallicrafters Collectors International: http://www.w9wze.org
----
http://mailman.qth.net/mailman/listinfo/hallicrafters