[Yaesu] mp amp keying?

[David Robbins K1TTT]

I can understand it when driving a 100v keying line, but these hf-2500 amps
use either 12v or 24v depending on vintage and about 75ma drain.  Not a very
hefty current even for those little relays.  

What does that arb-704 plug into?  The relay output or the band data jack or
something else??


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: yaesu-bounces at contesting.com [mailto:yaesu-bounces at contesting.com]
> On Behalf Of G4GED Dave
> Sent: Tuesday, November 18, 2008 06:32
> To: Yaesu at contesting.com
> Subject: Re: [Yaesu] mp amp keying?
> 
> 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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> > Yaesu at contesting.com
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> 
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