[K3CAL] dual band mobile antenna question

Thu Aug 2 17:35:05 EDT 2012

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

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> wrote:

From: KB3WFV <kb3wfv at yahoo.com>
Subject: [K3 CAL ] dual band mobile antenna question
To: k3cal at mailman.qth.net
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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