[1000mp] RX antenna port

[Marc Wullaert]

I'm using a K9AY or beverages and never use a protection because the rx is
disconnected
while transmit.
Never run in a problem.Maybe in a multi single or MM contest setup it will
be nice
to have some protection when.
I measure one time the power on a beverage while transmitting with 2kw (ON
can run this
power in contest) and had 1 watt picked up by the beverage.
marc on4ma

----- Original Message -----
From: <scarroll at mchsi.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Friday, March 18, 2005 4:29 PM
Subject: RE: [1000mp] RX antenna port


> I plan on hooking up a K9AY Loop as well (don't have room for a beverage)
for
> 160m/80m. In my case, after studying the FT-1000 MkV Field's schematic and
> querying Yaesu Tech Support, it was verified that during transmit ALL
receive
> inputs are completely disconnected & attenuated. According to the tech
support
> person I spoke to, he was quite confident that you wouldn't be able to
produce
> enough signal to fry the receiver front-end given the internal
configuration.
> Although, I'd sure like to hear more technical data on this from anyone
who is
> actually using such a configuration with a Field, etc. It nevers hurts to
get
> more inputs BEFORE it's too late.
>
> 73, Steve - K2SC
>
>
>
> Thanks !!!
>
>
> > I thought I recalled being told on this list any number of times that
the
> > "RX ant in" jack is, in fact, disconnected from the receiver during
> > transmit.  Not so?
> >
> > For SO2R, rather than disconnecting or shorting the RX antenna terminal,
> > wouldn't you need to use a passive limiting protective device, one with
a
> > small resistor in series and maybe 4 diodes in shunt? On the Mark 5, I
> > believe you can use the RX antenna switch position and all received
signals
> > will pass out through the "RX ant out" jack and in through the protector
> > and the "RX ant in jack."
> >
> > At 02:42 AM 3/18/2005, Jeff Maass wrote:
> >
> >
> > > > -----Original Message-----
> > > > From: 1000mp-bounces at mailman.qth.net
> > > > [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Barrie Smith
> > > > Sent: Thursday, March 17, 2005 8:22 PM
> > > > To: All about Yaesu 1000mp
> > > > Subject: [1000mp] RX antenna port
> > > >
> > > >
> > > > I'm going to be installing a K9AY loop as a 160M RX antenna soon.
> > > >
> > > > Is the RX port in any way protected during transmit on the MKV?
> > > >
> > > > Or, will I be building/buying something to short the port out during
> > > > transmit?
> > > >
> > > > 73, Barrie, W7ALW
> > > >
> > >
> > >Barrie:
> > >
> > >The "RX In" port of the MKV is not shorted during
> > >transmit. It's a good idea to protect it.
> > >
> > >First thing, any RX antenna will work best if
> > >located as far as possible from the resonant transmit
> > >antenna. If in close proximity, noise will be couple
> > >from the transmit antenna to the receive antenna.
> > >A little distance also decreased the amount of signal
> > >coupled back to the RX In port when transmitting.
> > >
> > >Protection is easy to provide. You can build a simple
> > >disconnect relay to mount at the radio, or commercially,
> > >there are:
> > >
> > >    KD9SV's Front End Saver ($60 from Radioware):
> > >       http://www.radiobooks.com/products/fes.htm
> > >
> > >    K9AY's RIP-1 ($35 from Array Solutions)
> > >       http://www.aytechnologies.com/Products/RIP1data.htm
> > >
> > >These are quick, and disconnect the RX antenna from the
> > >transceiver before the amplifier is keyed. The AY Technologies
> > >RIP-1 link above includes a schematic so you can get an
> > >idea of how it is connected.
> > >
> > >I've been using one of the KD9SV Front End Savers since
> > >1997, and have a couple at the PJ2T contest station. I
> > >just bought one of the RIP-1 to try as well.
> > >
> > >73,
> > >
> > >Jeff Maass  K8ND
> > >
> > >
> > >
> > >______________________________________________________________
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