[Elecraft] K3EXREF

[Edward R. Cole]

I was a beta-tester.  The kit I received included a BNC-F/sma-M 
adapter.  The cable to install has a sma-F connector.   So you can go 
either direction (BNC MM cable) or a cable with sma-M to BNC-M.  I 
chose the later (I already had a couple made) because it will present 
less mechanical stress on the sma connector on the K3.

Some years ago I modified my FT-847 to breakout separate 2m and 70cm 
Rx lines.  I used flange-mount sma-F connectors with RG-174 to 
accomplish this.  For awhile I used a BNC/sma adapter but accidently 
snagging the cable I broke the adapter.  Of course that could have 
also broke an sma connector.  Adapters are not cheap!

Many suppliers like Mouser and Digikey carry sma connectors for RG-58 
cable (typically crimp-style).  They are no harder to make up than a 
BNC connector.  If you really do not want to make up a cable, there 
are many companies that sell made-up cables with whatever mix of 
connectos you wish (try Googling assembled coax cables; or search e-bay).
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Message: 12
Date: Sat, 16 Apr 2011 10:56:19 -0500
From: Jim Sheldon <w0eb at cox.net>
Subject: [Elecraft] K3EXREF
To: Elecraft Mailing List <elecraft at mailman.qth.net>
Message-ID: <2011416105619.264114 at home-5700c25bca>
Content-Type: text/plain; charset="iso-8859-1"

Now I'm just waiting for Elecraft to get the K3EXREF board in 
production to the point they are available.   I have obtained a 
Trimble Thunderbolt, a Larsen marine GPS (read white mushroom) 
antenna and have ordered a 3 voltage power supply for the 
Trimble.  Right now I have it running on a pair of Lambda analog 
supplies (5 V and a +/- 12) tied together.  I still need to make up 
the cable to run from the Trimble to the K3.

My main question at this time is - What type connector is going to be 
on the rear of the K3 for the external ref?  The only thing I can 
find in the K3 manual (Rev D9) is on page 17 and it indicated that 
it's an SMA so if that's the case, I'll need to make up an SMA 
male-to-male cable to come from the Trimble to the K3.  (My 
Thunderbolt came with a  Mini-Circuits ZFSC-2-1, 5-500MHz 
splitter.  It was already connected to the 10MHz output by a short 
BNC to SMA connector, leaving 2 output ports from the splitter open.

I can make or obtain an SMA-SMA cable or if the K3EXREF input is a 
BNC, cables are already on hand for that.

Would appreciate any info on this prior to my being able to buy the board.

Jim - W0EB






73, Ed - KL7UW, WD2XSH/45
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