[Yaesu] mp amp keying?

[G4GED Dave]

Yes, and a cheaper alternative is the N0XAS "Universal Keying Adapter 2" 
kit, which gives optical isolation between rig and amp on the keying line.
My IC-750Pro used to suffer from "sticky" c/o relays when driving my old 
TL-922 amp 'cos that has 100V on the interface c/o line!
I use the UKA-2 now for all my Rig-to-Amp interfaces for peace of mind.

Google for HamGadgets.com or N0XAS
BTW, I have no connection with this firm, just singing praises where I think 
due!

73 Dave

----- Original Message ----- 
From: "Scott Manthe" <n9aa at arrl.net>
To: <Yaesu at contesting.com>
Sent: Tuesday, November 18, 2008 5:35 AM
Subject: Re: [Yaesu] mp amp keying?


>I use an Ameritron ARB-704 amp interface. It costs less than shipping
> the FT-1000MP in for service, which is pretty cheap protection for any
> number of amp/radio interfacing problems. Not nearly as sexy as the band
> data jack, but I don't worry about popping any transistors or getting
> sticky relays.
>
> Scott, N9AA
>
>
> K1TTT wrote:
>> I have had several mp's develop sticky amp keying relays.  This is now my
>> most common reason to have them serviced and would like to avoid this if
>> possible.  I see the band data jack has a tx ground through a 2n3444
>> transistor which is rated at  60v and 1a, with my hf-2500 amps and a 
>> small
>> relay that locks out the antenna switching I measure either 12v or 20v at
>> about 75ma, so it seems that transistor should be more than enough.  Does
>> anyone use that band data output for amp keying?
>>
>>
>> David Robbins K1TTT
>> e-mail: mailto:k1ttt at arrl.net
>> web: http://www.k1ttt.net
>> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.ne
>>
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