Good point Tom, beginning with too little drive would require more load C
than is available. That and the brass washer should be installed also.
Hi Lou,
The anti-corona washer was not in the SB1000 or early AL80A. It should be
added if a user might happen to mistune.
But I'd like to re
Good point Tom, beginning with too little drive would require more load C than
is available. That and the brass washer should be installed also.
-Original Message-
From: Tom W8JI
To: Jim Murray ; topband
Sent: Thu, Dec 17, 2015 7:31 am
Subject: Re: Topband: Heathkit SB-1000
Anybody know how to make an SB-1000 tune properly on 160? Ok on other
bands but doesn't like 160, dummy load or well tuned Inv.L. Is it a quirk
of the amp needing a modification or possibly a bad component? Saw nothing
obvious before putting it to use but have not had the cover off
since.Thanks
or else
eventually that contact will burn up if it hasen't already.
-Original Message-
From: Rich Cariello
To: Jim Murray
Cc: topband
Sent: Thu, Dec 17, 2015 6:00 am
Subject: Re: Topband: Heathkit SB-1000
Jim,
To get closer to the needed value of the additional transmitting
If you see no dip in the PA current then check and see if the tuning
capacitor padding capacitor is open or disconnected. Check the leaf on
the band switch that corresponds to the `160 meter position which also
switches in the additional fixed capacitor and make sure it is making a
good contac
Jim,
To get closer to the needed value of the additional transmitting cap I would
try to find out the max value of the load cap that came with the amp. Halve the
value and that's what I would install. I recall the amp would kind of tune up
around 2 mg with max load cap value. Adding an additiona
Jim,
If I remember correctly placing an additional transmitting type cap across the
units load cap did the job. Don't remember the value I used. My guess 100 or
200 PF. I used a cap I had in the junk box. You will need to remove the cap in
most cases for the other bands.
Rich AA2MF
Sent from m
Anybody know how to make an SB-1000 tune properly on 160? Ok on other bands
but doesn't like 160, dummy load or well tuned Inv.L. Is it a quirk of the
amp needing a modification or possibly a bad component? Saw nothing obvious
before putting it to use but have not had the cover off since.Tha
