K3/Heath SB-200

[Larry Boekeloo]

Hi everyone...

Has anyone used a Yaesu FRB-757 Relay Box connected to a K3?  The FRB-757 requires 12 volts but there is no indication in the instructions if the FRB-757 draws more than .5 amps.  My Alpha 87a is going into the shop and I need my SB-200 as a backup.  I haven't had time to put the Harbach Softkey mods in the SB-200 yet.  Too much time playing with the K3!

Thanks.

Larry, KN8N
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[Don Wilhelm-4]

Larry,

Why not measure the current.  Break the positive 12 volt Power Supply
connection and insert your DMM set to measure current.  Then short the
keying input line on the relay box.  You DMM will tell you how much
current is being drawn.

A new K3 has a 1 amp rating on the 12 volt output.  Older K3s can be
upgraded with the kit from Elecraft.

73,
Don W3FPR

On 3/4/2014 6:37 PM, Larry Boekeloo wrote:

> Hi everyone...
>
> Has anyone used a Yaesu FRB-757 Relay Box connected to a K3?  The FRB-757 requires 12 volts but there is no indication in the instructions if the FRB-757 draws more than .5 amps.  My Alpha 87a is going into the shop and I need my SB-200 as a backup.  I haven't had time to put the Harbach Softkey mods in the SB-200 yet.  Too much time playing with the K3!
>
> Thanks.
>
> Larry, KN8N
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[riese-k3djc]

the output relay is driven/switched by a transistor should be little
current involved
the heath keys off the final bias supply ?? 130 volts and a fair amount
of current
I would always use an interface between a modern rig and any older amp
the ol heath amps are a fantastic deal with or without the harbach mods
I just completed mine with an upgrade for the fan  the soft start/key and
power upgrades are
well worth the price and the fun of installing
Harbach makes a good product and support

Bob K3DJC



dnt b
On Tue, 04 Mar 2014 19:08:12 -0500 Don Wilhelm <[hidden email]>
writes:

> Larry,
>
> Why not measure the current.  Break the positive 12 volt Power
> Supply
> connection and insert your DMM set to measure current.  Then short
> the
> keying input line on the relay box.  You DMM will tell you how much
>
> current is being drawn.
>

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