[Elecraft] K3 and Quadra amp

[Jerry Flanders]

According to the schematics, the Quadra does not have the internal 
pullups like the FL-7000 does (the FL-7000 is known to work with the 
K3) . I finally got out my Quadra tech supplement during a lull in 
yesterday's RTTY contest and and traced out the band data lines. No 
pullups, and the schematic even shows "test point" 0 volts is present 
on all.  This morning I verified 0 volts on all the band data lines 
from the Quadra with my meter.

In contrast, the FL-7000 schematic
( http://www.n4ats.com/downloads/FL7000_Schematic.pdfclearly ) shows 
10K pullups to a +5 volt regulator.  At least one guy has his FL-7000 
working, and this might explain it.

I just ordered one DB15HD breakout board ( 
http://www.winfordeng.com/products/brk15hd.php ) and will make up a 
new cable with pullups. My first attempt was just connector to 
connector through 2 ft of 8 conductor cat-5 cable, and there is 
simply not enough space inside those connectors to build a pullup 
circuit, I think. That breakout board should give enough space for 
all I need, including the FSK line and ALC. It also has screw 
terminals, which should make it somewhat easier to patch it all together.

Dimensions are in question - the board is wider than I have clear 
space for at the back of the K3, and I may have to trim off a portion 
of the board to clear the nearby DB9 socket.

It should be here Wednesday/Thursday, and I will report again when I 
check the fit and get it wired up. If it fits, it looks like a good 
solution to the problem of connecting up to all those dozen or so 
pins in the DB15HD that I need. It is a little pricey at $16 + 5.50 shipping.

Jerry W4UK

At 02:39 AM 6/16/2008, Joe Subich, W4TV wrote:

>Jerry,
>
>How did you wire your interface?
>
>Did you use "Band Data 1" (DIN8/262) or "Band Data 2" (DB15)
>on the Quadra?
>
>What are the symptoms ("No go")?
>
>
>Remember, the pin numbering on "Band Data 1" (DIN8/262) is
>different than the standard DIN8 - pin 6 on the standard
>connector is pin 7 ("D") on the 262, pin 7 on the standard
>is 8 (inhibit) on the 262, and pin 8 on the standard is 6
>("C") on the 262
>
>My Quadra is still in storage ... I have not hooked it up
>yet but may cobble together a cable this week to try it.
>
>73,
>
>    ... Joe, W4TV
>
>
>
>
> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jerry Flanders
> > Sent: Saturday, June 14, 2008 1:30 PM
> > To: Elecraft at mailman.qth.net
> > Cc: elecraft_k3 at yahoogroups.com
> > Subject: [Elecraft] K3 and Quadra amp
> >
> >
> > Anybody have the band data cable working? I carefully wired mine up
> > but no go. Sure would be nice to KNOW it can be made to work.
> >
> > Jerry W4UK
> >
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