[Heath] Heath SB 300 series receivers

[Glen Zook]

Sorry to take so long to answer!  Was in the hospital for a few days!
The 3-interconnect cables for HFO, BFO, and LMO, in the SB-40X and SB-30X equipment are made from RG62/U cable, 24-inches long.  RG62/U is 93-ohm cable and has very low capacitance when compared with RG58/U or RG59/U cable.
I can make interconnect cables although need to replenish my RG62/U cable stock.
Details at:
http://nebula.wsimg.com/ad2c0bf4bd9785bfb1dd5ba5e06e5668?AccessKeyId=5DDC3F25F0398F58962E&disposition=0&alloworigin=1

Glen, K9STH 

Website: http://k9sth.net
      From: Kenneth G. Gordon <kgordon2006 at frontier.com>
 To: John King via Heath <heath at puck.nether.net> 
 Sent: Sunday, December 14, 2014 12:48 PM
 Subject: Re: [Heath] Heath SB 300 series receivers
   
On 13 Dec 2014 at 14:08, John King via Heath wrote:

> Howdy Greenies!! I have a Heath SB 400 and a SB 401 transmitter, but I do not
> have matching receivers that will transceive with the transmitters. Which Heath
> SB receivers will transceive with those transmitters?  I know there were SB 300,
> SB301 and SB 313 receivers but am not sure if they will all transceive with the
> SB 400 and SB 401 transmitters.

Yes, as I remember it, ALL of the above will transceive with either of the two 
transmitters mentioned.

I have a 301/401 combo here, which I really like. The 301 can use some 
"enhancements" such as voltage regulation added to the BFO and HFO, but 
these are "trivial" mods.

The only thing I had to do to my '401 was to paint the "silver" tube shields 
over various tubes, inside and outside with flat black paint. This reduced the 
tube-heat by 17%.

Also, don't forget that the systems were designed to use ONLY 68 (?) ohm 
coax to connect the various bits, and NOT 50 or 75 ohm coax, AND those 
must be of a certain length due to the capacitance needed in the circuit.

I believe Glenn Zook used to sell the necessary cables all made up in a 
bundle. Maybe he still does. He is a "denizen" here and may answer himself.

Ken W7EKB
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