[Boatanchors] Heath DX-100 modification information and other transmitter service information

[Glen Zook]

By the way, the SB-10 was originally designed to be used with the DX-100 and was to be called the DX-10.  However, delays in production resulted in the unit not being ready until after the introduction of the TX-1 Apache.  There are references to the DX-10 in the last version of the DX-100B manual.

After the Apache was introduced, the DX-10 cabinet was redesigned and the nomenclature changed to SB-10.
 
Glen, K9STH


Website:  http://k9sth.com


________________________________
From: RAY FRIESS <rayfrijr at msn.com>
To: Glen Zook  <gzook at yahoo.com>; " boatanchors at mailman.qth.net  " <boatanchors at mailman.qth.net>
Sent: Monday, October 31, 2011 10:50 AM
Subject: Re: [Boatanchors] Heath DX-100 modification information and other transmitter service information

so the sb 10 was not officially incorporated until the apache cameout which had the connections provided for from the start. the apache is basically a repackaged dx 100 it sounds like. ---------- Sent from my Verizon Wireless mobile phone


-----Original Message-----
From: Glen Zook
Sent: 10/31/2011 3:05:02 PM
To: RAY FRIESS , boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Heath DX-100 modification information and other transmitter service information
The only modifications from the DX-100 which were incorporated in the DX-100B were the continuously variable loading control, the changed cabinet, changing the crystal switch from a 4 position on the front panel to a single slide switch (for 1 crystal) which required opening the door in the top of the cabinet, and 3 capacitor values in the driver circuit which slightly increased the drive on 10-meters.  Also, 2 additional holes for adding SO-239 connectors were in the rear of the chassis so that the kit for using the SB-10 could be added.  In the original DX-100 you had to drill these holes when installing the kit to use the SB-10.

By the way, original DX-100 transmitters which had the MK-3 (continuously variable loading control) added were unofficially called DX-100A.  This was one of the reasons that the next version was called the DX-100B.

The "improved keying", which also added a spotting switch, and the SB-10 modification were not included in the DX-100B.  Only the change from the switched fixed capacitors with 150 pf variable loading capacitor to the continuously variable load control was incorporated in the DX-100B.

Glen, K9STH


Website:  http://k9sth.com


________________________________
From: RAY FRIESS <rayfrijr at msn.com>
To: Glen Zook  <gzook at yahoo.com>; "boatanchors at mailman.qth.net " <boatanchors at mailman.qth.net>
Sent: Sunday, October 30, 2011 9:06 PM
Subject: Re: [Boatanchors] Heath DX-100 modification information and other transmitter service information


I have a dx 100B that I am about ready to get ready to put back on the air.  Did the B model incorporate all the mods when it came out? ----------
Sent from my Verizon Wireless mobile phone



-----Original Message-----
From: Glen Zook
Sent: 10/30/2011 8:14:38 PM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Heath DX-100 modification information and other transmitter service information
I have been asked several times in the past couple of weeks for information on various official modifications (Heath recommended) as well as things like the tube pin voltages (which are not included in the manual) and general transmitter servicing information.  This information was gathered over 50 years ago when I had my first DX-100.  Some of this information was widely distributed but other information was not widely distributed.  However, all the information came directly from Heath (when growing up I lived about 35 miles from the Heath plant on Hilltop Road in St. Joseph, Michigan).

I have added a link on my website with all of the official Heath modification information on the DX-100 that I have.  Also included is the tube voltage information and a Heath pamphlet on general transmitter servicing.

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

Glen, K9STH

website:  http://k9sth.com
______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com ** 


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html