[K3CAL] dual band mobile antenna question

Thu Aug 2 17:50:37 EDT 2012

Talk to you tonight.

Best Regards,

Jim Tetlow

K3UGA

jimtetlow at chesapeake.net

  _____  

From: k3cal-bounces at mailman.qth.net [mailto:k3cal-bounces at mailman.qth.net]
On Behalf Of KB3WFV
Sent: Thursday, August 02, 2012 5:35 PM
To: Calvert Amateur Radio Association - K3CAL
Subject: Re: [K3CAL] dual band mobile antenna question

Thanks Jim

I am looking at any rig that has crossband repeat.

I am partial to the Yaesu ft 8800 although I am also looking at 

the Kenwood TM D710A and others. Really don't know at this point 

There is a 440 mach that is linked from the PA line down through to 

Southern Maryland although I am more intrested in the dual band more so 

for the crossband repeat. I want to be able to use my HT to trigger the
higher 

output better gain antenna mobile in the truck. Basicly extending the range
of the HT

while at the same time freeing me from sitting in the truck all the time. 

Guess I'm figuring that if I have to buy a mobile any how, Might as well 

buy one that has some features that let me expand if I want or need to. 

Brian

KB3WFV

--- On Thu, 8/2/12, Jim Tetlow <jimtetlow at chesapeake.net> wrote:

From: Jim Tetlow <jimtetlow at chesapeake.net>
Subject: Re: [K3CAL] dual band mobile antenna question
To: "'Calvert Amateur Radio Association - K3CAL'" <k3cal at mailman.qth.net>
Date: Thursday, August 2, 2012, 2:10 PM

The dual band antennas for 2 meters and 440 are both resonant since the 440
is almost ½ the 2 meter wave length, thus the antennas have more gain on 440
than 2 meters.. 

Will work the same way as a repeater functions.

Electricity is very fast!!!! But there has to be some delay between the
input and the output, or you will overload the receiver front end.

What radio are you looking at? Who's on 440 local down here?

Best Regards,

Jim Tetlow

K3UGA

jimtetlow at chesapeake.net
<http://us.mc1617.mail.yahoo.com/mc/[email protected]> 

  _____  

From: k3cal-bounces at mailman.qth.net [mailto:k3cal-bounces at mailman.qth.net]
On Behalf Of KB3WFV
Sent: Thursday, August 02, 2012 1:33 PM
To: Calvert Amateur Radio Association - K3 CAL
Subject: Re: [K3 CAL ] dual band mobile antenna question

Thanks Chuck

Dick 

That is what prompted the question. While looking at several 

different radios I expected to find two connectors for those with

crossband repeat. Instead I noticed that the rear panel only has 

one antenna connector. 

I started thinking about which would be better one or two antenna's.

Looks like a single dual band antenna will be fine and two mono band
antennas would

have little to no advantage in performance. It seems like two antennas may
decrease performance due to the possible additional loss of more connections
through the external duplexer.

Mind boggling that two separate frequencies can travel the same 

antenna and the same coax in opposite directions at the same time.  

Brian

KB3WFV

--- On Thu, 8/2/12 , R Ratcliffe <rratcliffe at comcast.net> wrote:

From: R Ratcliffe <rratcliffe at comcast.net>
Subject: Re: [K3 CAL ] dual band mobile antenna question
To: "' Calvert Amateur Radio Association - K3 CAL '" <k3cal at mailman.qth.net>
Date: Thursday, August 2, 2012 , 9:58 AM

Which radio are you using? Does it have two separate connections for
antennas? If it only has one antenna connection then you have the same
problem except you have an additional piece of equipment between the
antennas.

Dick

From: k3cal-bounces at mailman.qth.net [mailto:k3cal-bounces at mailman.qth.net]
On Behalf Of KB3WFV
Sent: Thursday, August 02, 2012 12:48 PM
To: Calvert Amateur Radio Association - K3 CAL
Subject: Re: [K3 CAL ] dual band mobile antenna question

Thanks for the input 

So, a single dual band antenna will work fine for a radio that can

cross band repeat ? 

The TX on 2 meters won't interfere with the RX of the 440 (or vice versa)
when 

the radio is connected to only one antenna ??  

Brian

KB3WFV

--- On Thu, 8/2/12 , KB3WFV <kb3wfv at yahoo.com
<http://us.mc1617.mail.yahoo.com/mc/[email protected]> > wrote:

From: KB3WFV <kb3wfv at yahoo.com
<http://us.mc1617.mail.yahoo.com/mc/[email protected]> >
Subject: [K3 CAL ] dual band mobile antenna question
To: k3cal at mailman.qth.net
<http://us.mc1617.mail.yahoo.com/mc/[email protected]> 
Date: Thursday, August 2, 2012 , 7:05 AM

Hello 

I am considering purchasing a new 

dual band 2m/440 mobile radio with crossband repeat

and I am wondering about the antenna (s).

Which would be better?

A single dual band antenna

or two antennas one 2 meter and one 440 

with a duplexer

Brian

KB3WFV  

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