[Heathkit] SB-401

[Greg Mijal]

Suggest you re-check your cabling first.  Some times a female phono 
connector will get old and not make contact with the male prong on the 
cable.  A good RX for that is to open up the radio and squeeze those female 
receivers with a pair of pliers but don't crush them together.
Also, if your 401 doesn't have the crystal pack installed you have to have 
the function switch in "transceive mode". This mode uses the hetrodying 
crystals from the receiver to mix the low level RF to proper frequency.
Check for plate current by closing the key on the mic (mic gain control at 
fully off) and the meter in the plate amps position.  You should see 50 ma 
of idling current.  If it's not there, you got a problem somewhere else like 
an open plate choke etc.
For the pegged ALC, have a look at the diodes around the PA.  Heath's ALC is 
a bit more complicated that others in it's class (more diodes and protection 
circuits)
Good luck and give me a holler if you want to chat up the greenies.
73's
Greg
WA7LYO
Kinston, NC
----- Original Message ----- 
From: "Jerry Felts" <nr5ajerry at gmail.com>
To: <heathkit at mailman.qth.net>
Sent: Saturday, October 24, 2009 1:26 PM
Subject: [Heathkit] SB-401


> Last nite I finally got around to hooking my SB-401 to the SB-301. The
> transmitter has no visual output but I can near it on my FT-450. ALC is
> pegged on the meter, but no other meter movement.  Where would  you
> start?
>
> Jerry - NR5A - South Dakota
> http://nr5asstuff.blogspot.com/
> http://nr5abeaconblog.blogspot.com/
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