[Boatanchors] DX100 accesory socket

Thu Dec 5 11:24:15 EST 2013

The DX-100B has to be modified to use the SB-10.  There are holes in the back of the chassis for SO-239 connectors to be installed for the SB-10 but nothing else.  Unless the modification has been made, and if the added switch on the front panel is in the SSB position, then there should be grid drive.

There are all sorts of things that could cause no grid drive.

First, is the VFO actually working?

Check the VFO / crystal switch and clean the contacts.  On the original DX-100 this switch is on the front panel and on the DX-100B this is a slide switch mounted on the chassis and has to be accessed through the door on the top of the cabinet.

Clean all the contacts on all of the rotary switches.

Make sure the drive control is working.

Make sure that the VFO switch is in the proper position.  This switch is mounted on the chassis and is operated by a cam arrangement from the main bandswitch.

There is, on my website, a compilation of service information on the DX-100 including the various "official" Heath modifications.  There is a schematic of the original DX-100 on the second page.  Also included is a chart of the various voltages on each of the tubes.  This information is not in any of the manuals for the DX-100 or the DX-100B.  The information was provided to me by Heath back in like 1960 or 1961 and was basically an "in house" document.

http://k9sth.com/uploads/Heathkit_DX-100_mods-1.pdf

I "grew up" almost in Heath's backyard.  I lived in LaPorte, Indiana, which is about 35-miles from the Heath plant on Hilltop Road in St. Joseph, Michigan.  The mailing address was Benton Harbor but the actual plant was on the south side of Benton Harbor in St. Joseph.

Glen, K9STH

Website:  http://k9sth.com

On Thursday, December 5, 2013 8:46 AM, Tom Chesek <tchesek at epix.net> wrote:

I'm not at home near my DX-100 or my manual but if I think that if your 
DX-100 has been configured to use the SB-10 single sideband adapter or if it 
is a DX-100B, and if the SB-10 is not connected, you then must have a 
coaxial jumper between the two SO-239 connectors on the rear of the chassis.

Tom K3TVC

-----Original Message----- 
From: Rich Yost
Sent: Thursday, December 05, 2013 9:39 AM
To: Roland Hull ; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] DX100 accesory socket

Ronnie,

There are no jumpers needed in the Remote Socket for the dx-100 to work
I have 4 in operation all with the remote socket being used for the remote 
switch, but it should work just fine without anything in the socket ( unlike 
Rangers )
the dx-100 schematics are on the web in pdf & jpgs, I can send you one if 
you need one.

Rich
n2ry

On Thursday, December 5, 2013 9:25 AM, Roland Hull <w5sum at comcast.net> 
wrote:

Alright men, I need some help here, I have only a partial manual for a dx100 
with no schematic in it. Currently I can't seem to download squat, guess 
comcast is playing  up again.

So what I need to know is this.  Are there jumpers that have to be in place 
on the accessory socket for the rig to work. Most rigs do.

The manual references a 'remote b+ switch' using four contacts on that 
accessory plug but it doesn't clearly state if jumpers have to be there for 
the rig to work if not using a remote switch.

My DX100 has no grid drive at all.. n uttin..

I have plate voltage when the B+ switch is switched at the front panel.

all tubes check good.

Thanks in advance and 73's

Ronnie W5SUM
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