[1000mp] RX antenna port

[Jeff Maass]

> -----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