[Heathkit] DX 100/100b rear octal socket wiring

[Glen Zook via Heathkit]

The pins, on the octal socket on the rear of the DX-100 / DX-100B for the relay activation (120 VAC) are pin-2 and Pin-4.

You can use a DPDT 120 VAC coil relay, like from Radio Shack, to both mute the receiver and to change the antenna from the receiver to the transmitter.  Use 1-set of the contacts to change the antenna and 1-set to mute the receiver.

A "cheap and dirty" way is to solder the antenna connections, using RG-58/U or RG-8X, to the relay or, you can use an aluminum mini-box on which you have mounted SO-239 connectors.

A suitable relay is

http://www.radioshack.com/product/index.jsp?productId=2049721


and they cost $4.97.  You don't need a socket, just connect directly to the terminals.

For HF, this arrangement works fine.
 
Glen, K9STH


Website:  http://k9sth.com


On Thursday, June 12, 2014 3:42 PM, Andrew Kopke <andrewkopke at rocketmail.com> wrote:
 


Hello, I have a dx 100B and I want to connect a 110 v relay to mute the receiver. I have the none b manual.  It appears to be pins 2 &4 . I can't read anything on the outside of the socket and will probably have to trace it to be sure. I Certainly don't want to have any fireworks. So my question is : Is the wiring the same on that socket on ALL Dx 100's ? Reading the manual  says that 110 v is present with the plate switch on. I am planning on using the transmitter CW only. Basically , I'm going to use a coax switch to manually transfer between xmtr and rcvr. I know it sounds risky,but when you're low on cash sometime you have to improvise.

Thanks for any help, 

Andrew
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