[1000mp] Bad Antenna Relay?

Fri, 31 Oct 2003 12:05:11 -0800

It appears that there are problems with some of the small DIP-footprint
relays, which may be involved with the complaint of many of us that the RX
signal drops by many dB on an erratic basis, but is then restored by TR/RX
cycling. Yaesu in fact replaced one of those relays in my MP in 1999--but
the problem has returned.

Garry, NI6T

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of
[email protected]
Sent: Friday, October 31, 2003 6:34 AM
To: [email protected]
Subject: RE: [1000mp] Bad Antenna Relay?

I had exactly the same experience as John on my MP. That was also a cold
joint in my MP also. Repaired in 5 minutes problem gone.

Unlike the PIN diodes the relays in the MP are of good quality. I doubt that
they could develop faults.

73!

Zoli HA1AG

> -----Original Message-----
> From: John Tait [mailto:[email protected]]
> Sent: Wednesday, October 15, 2003 00:24
> To: [email protected]
> Subject: Re: [1000mp] Bad Antenna Relay?
>
>
>
>
> Subject: RE: [1000mp] Bad Antenna Relay?
>
> Perhaps... I was getting an  "hi-SWR" message
> occasionally...Press the ptt
> and all OK again..
> On RX, it varied from no RX, to low sig strength to (mostly) perfectly
> OK..When it did go quiet, I'd just hit the PTT again, and all would be
> fine...'till the next time..
> I kept blaming bad antenna connections, bad coax links etc..
>
> John EI7BA
>
>
> > Thanks for the hint, John---but would you not expect to see
> even bigger
> > problems on Transmit with a flaky connection to the output
> connector? I
> have
> > seen no reports of that!
> >
> > Garry, NI6T
> >
> > -----Original Message-----
> > >From: [email protected]
> > [mailto:[email protected]]On Behalf Of John Tait
> > Sent: Tuesday, October 14, 2003 11:19 AM
> > To: [email protected]
> > Subject: Re: [1000mp] Bad Antenna Relay?
> >
> >
> >
> >
> > Subject: Re: [1000mp] Bad Antenna Relay?
> >
> > I don't know if the MK V antenna connections are like the
> MP... If so,
> > check the wire connection from your SO239 antenna sockets
> to the PCB..
> > They have a nasty habit of breaking the solder joint on the
> PCB, creating
> >  an intermittant connection, just like a "sticky" relay.
> > The SO239 mounting plate is not screwed to  the main back panel, and
> > flexes inwards when you push home the PL259 plugs.
> > This can break the solder joint....It's a good idea to
> replace the stiff
> > wire
> > from the SO239 with a multistrand(and therefore flexible) wire.
> >  This is a very common problem on FT1000MPs..
> >      GL es 73
> >                       John EI7BA  http://www.iol.ie/~bravo/
> >
> >
> > > Paul Franson wrote:
> > >
> > > > I've got an MP MARK-V - for a while when using antenna
> A the receiver
> > > > sensitivity would be way down when switching from xmit
> to receive.
> > > > Hitting the MOX button once or twice would fix it.  Now
> it's doing it
> > > > on antenna B also - guess I'll have to fix it.  I'd
> guess it's a relay
> > > > with dirty contacts - right?  Where is it?
> > > >
> > > > Thanks for any tips
> > > >
> > > > Paul  W2LE
> > >
> > > Oddly enough, I have experienced a similar problem over
> the past few
> > > days and was just resigning myself to having to dig into
> the rig when I
> > > discovered I had mistakenly twiddled the squelch control
> when I planned
> > > to adjust the monitor level.  Now I have restored the
> squelch control to
> > > its fully CCW position the problem has gone away.
> > >
> > > I'm sure that won't be what you fellows have done but I'm
> happy to bare
> > > my backside just in case!
> > >
> > > 73
> > >
> > > Bob, 5B4AGN
> > >
> > >
> > > _______________________________________________
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> >
> >
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