[1000mp] RX ANT

[Tod - ID]

Do a search on "front end saver" or "FES" or KD9SV with Google. You can also
search the archives of this reflector (I think ) looking for 'front end
protection' or something similar.

If you have REALLY big BC band signals you may want to consider building a
small in-line filter that reduces BC band signals below the diode conduction
point. I think the best choice is to have a relay that shorts the RX input
when power is NOT applied to the relay and permits RX signals to go through
when the relay has been powered. You can control the relay with the PTT line
which is grounded on transmit. By control I mean that you would use that
logic signal to tell the relay to activate. The point is to have the RX
input grounded on transmit and also grounded if the relay does not get
activating voltage.


Tod, KØTO

> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net 
> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of VE3QN
> Sent: Tuesday, February 21, 2006 10:02 AM
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] RX ANT
> 
> Is there any way to look up messages on this subject?
> 
> I have a separate receive antenna which I sometimes find 
> useful; however, I'm now concerned I may not be doing enough 
> to protect the FT-100MP MkV. I do have an external box which 
> routes in the external RX antenna line and which incorporates 
> two 1N914 diodes back-to-back to ground on the antenna line 
> but this may not be enough.
> 
> Bryan  VE3QN
> 
> ----- Original Message -----
> From: "Tod - ID" <tod at k0to.us>
> To: <1000mp at mailman.qth.net>
> Sent: Tuesday, February 21, 2006 10:40 AM
> Subject: FW: [1000mp] RX ANT
> 
> 
> 
> The RX out and RX in jacks at the back of the radio are 
> invaluable if you
> are going to use an external RX antenna and/or you wish to use a noise
> cancellation device such as an MFJ-1025/1026. The RX out provides the
> received signal from the transmitting antenna. The RX in 
> accepts an input
> from an antenna that is not the transmitting antenna. The front panel
> control for selection of antennas has an option for RX or A/B . If you
> select RX the radio looks for the receiving signal to be 
> coming in from the
> RX in jack and uses A or B as the transmitting antenna.
> 
> If you do choose to have a separate RX antenna be absolutely 
> certain to
> provide RF voltage protection for the RX in line so that you 
> do not damage
> the front end of the FT1000X. The best system is to ground it when
> transmitting. Many past reflector messages have commented on this and
> provided information.
> 
> If you use noise cancellation, such as an MFJ-1026, the RX 
> out jack will
> provide a sense antenna signal that can feed into the AUX 
> port of the 1026.
> The RX antenna would go into the MAIN port of the unit. The 
> output of the
> unit goes into the RX in port on the back of the radio. It is 
> a very simple
> and elegant way to handle the challenge of line noise(or other noise)
> cancellation.
> 
> Tod, KØTO
> 
> 
> > -----Original Message-----
> > From: 1000mp-bounces at mailman.qth.net
> > [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of AmateurRadio
> > Sent: Tuesday, February 21, 2006 5:46 AM
> > To: 1000mp at mailman.qth.net
> > Subject: [1000mp] RX ANT
> >
> > Can someone please point me in the direction of information on the
> > function and use of the RX ANT OUT connector?  I have checked the
> > manual but am none the wiser.
> > Thanks
> > Jim
> > ______________________________________________________________
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> >
> >
> 
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