Usually the diplexer as a filter is only needed to keep the 2m tx from
overloading a 70cm preamp. For a two radio setup with no preamp, it usually
isn't needed at all.
73, Drew KO4MA
Sent from my iPhone
On Jun 3, 2012, at 10:45 PM, Greg D ko6th.g...@gmail.com wrote:
So, all the on-line
My portable setup using an arrow antenna doesn't use a diplexor or duplexor.
With the setup for 2m uplink, I connect my VX5R to the two meter driven element
with a piece of RG-8X.
I connect my Icom IC R10 to the 432 mhz driven element with another piece of
RG-8X. Just turn the radios on,
On 02/06/12 17:33, Robert Coppock wrote:
hola, i am trying to determine the best way to work full duplex on the birds
with 2 HT's or radios. i cannot find any info so far on the web. my concern
is to keep the transmit power out of the receive radio, i guess basically the
difference
Robert:
I have used a duplexer on the UHF side of my satellite ops for several
years. I find that some radios have more of a desense problem than
others. Here is a link to my website where I briefly talk about what I
do on portable ops and using what is referred to as a Mode J filter -
So, all the on-line information seems to point to this solution -
putting a diplexer (filter) on the 70cm side to tap off and absorb the
incoming 2m signal. Isn't there also a design where one puts a filter on
the 2m side, to tap off and absorb the 70 cm (3rd harmonic of 2m) signal?
I would
If I understand your wiring, I think you have it correct.
Is this what you are trying to do?
http://www.amsat.org/amsat-new/articles/Mode-J/
Note that for mode-B satellites where you are transmitting on 70cm and
receiving on 2m, this won't work. In my experience, the extra filtering
is also
-bb] Re: full duplex w/ 2 HT's
If I understand your wiring, I think you have it correct.
Is this what you are trying to do?
http://www.amsat.org/amsat-new/articles/Mode-J/
Note that for mode-B satellites where you are transmitting on 70cm and
receiving on 2m, this won't work. In my experience
To: ko6th.g...@gmail.com; robertinor...@webtv.net
CC: amsat-bb@amsat.org
Subject: [amsat-bb] Re: full duplex w/ 2 HT's
I am not sure that the filtering from the small duplexer with the Arrow is
significant enough compared with the injection loss that it will produce.
I would try it first plumbed
