[Heathkit] DX-100B questions / problems

[lee]

The differences are:
1. Different cabinet.
2. Different loading capacitor system.
3.  Holes already drilled for SB-10 kit.
4.  Only one crystal slot  in the B rather then a switch for 4 in the 
DX-100.  Thus the B only has a switch  to go between crystal and VFO and the 
DX-100 had the VFO switch as well as a crystal selector switch.
5.  The B has a nickel plate chassis rather then copper plated as in the 
DX-100
6.  Improved keying and spot switch.
7. The un terminated wire is the neutralization wire for the 6146 finals. 
(Its moved about until the tubes are neutralized)

As why you don't have any output,  that could be caused by a very large 
number of things.  In most cases a DX-100 manual would work to trouble shoot 
your problem.  Contact me off line and I will give you a bit more helpful 
information

Lee, w0vt
pulsarxp at embarqmail.com





-----Original Message----- 
From: Rick Poole
Sent: Sunday, November 13, 2011 8:00 PM
To: heathkit at mailman.qth.net
Subject: [Heathkit] DX-100B questions / problems


I have had no luck in locating my manuals for the DX-100B and the
SB-10.  A couple of people on this reflector very kindly emailed me
copies of the mods.dk manual for the DX-100 (non-B), but
unfortunately large portions of that manual, including virtually the
entire construction section, are missing... and anyway the DX-100 has
a lot more differences from the DX-100B than I thought.

So I hope it's OK with you guys if I ask some RTFM-type questions...
I will be ordering another manual but it'll be several days before it
gets here.

My problem is that I can't get any output.  I hooked up a dummy load,
turned on the transmitter, set Drive and Driver to zero and Plate to
mid-scale, then turned on the Plate switch and hit the key.  I get an
indication on the meter with the switch set to the Driver position,
an indication that changes with the setting of the Drive control, but
that is all... no grid current, no plate current, no output.

I'm told, I think by somebody on this reflector, that one big
difference in the DX-100B is that it is specifically set up to use
with the SB-10 sideband adapter.  On the back apron are three coax
connectors, two of which are labeled "Out to SB-10" and "In from
SB-10", and an octal accessories socket that also connects to the SB-10.

I do have an SB-10 but do not plan to use it with the DX-100B, at
least not any time soon... my plans for this rig changed a bit since
I bought it and for now all I want is something on 160- and 75-meter
AM and CW.  So I don't have the SB-10 adapter connected at all.  Is
there something I need to do to compensate for that, like maybe some
jumpers in the octal plug that goes to the adapter, or a coax jumper
between the "Out to SB-10" and "In from SB-10" connectors on the back?

Also, another question... There is a piece of heavy wire that runs
from the Driver variable capacitor, through a grommeted hole in the
PA shield, and then runs over to the space between one of the 6146's
and one of the transformers (the modulation transformer, I
think)  There it stops, with the end hanging in free air, and doesn't
connect to anything, and isn't anywhere near anything that looks like
it should connect to.  Is that some kind of neutralization gimmick or
something?

Like I said, all RTFM-type questions... wish I could find my "TFM" so
I could "R" it... :-(

Rick WA1RKT

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