[App_rpt-users] simplex vs duplex for a home node

[Elden Fenison]

Thanks for the info Doug. That strange whooshing sound you may have heard a
little while after you sent this was most of that info flying right over my
head. I'm afraid I don't have the level of electronics knowledge to tackle
most DIY projects. I even paid for my URI cable (that should tell you
something).

But great info! My take-away on all this is that I would need essentially
four radios and two URIs. I would need two of the radios to interface to
the node via the URIs. And then two radios (HTs possibly) to be able to
transmit to one of those, and receive from the other at the same time. This
seems like a huge hassle. Although I could probably use cheap chinese HTs
for all four. I did see a like on your site that showed soundcard FOBs with
HT connectors.

That assumes I want to do this using RF. Dialing my node and operating via
telephone or hanging a speaker off of a soundcard FOB sound like a few
other ways. (I assume when you referenced iaxrpt, you were talking about
interfacing with a telephone).

On Sat Jan 17 2015 at 5:36:21 PM Doug Crompton <doug at crompton.com> wrote:

> The main reason to use full duplex is to have the capability to command
> your node while another station is transmitting. In half duplex you have to
> wait for a clear channel. The real feature of full duplex (being able to
> talk like you are on the phone) would only be achieved if you had
> completely full duplex systems at both ends including the user transceiver.
> This could be achieved without radios using iaxrpt at both ends.
>

> You could use two cheap radios, one RX and the other TX for full duplex.
> You would either need enough antenna separation or use a small duplexor
> with one antenna.
>
> To see my simple repeater using the SA818 modules see -
>
> http://crompton.com/hamradio/818_transceiver_module/
>
> Or the link on hamvoip.org
>
> You could use any two radios, mix or match, to achieve the same result.
>
> Remember to set  duplex=2 in rpt.conf if you are using it as a repeater
> full duplex.
>
>
>
> *73 DougWA3DSPhttp://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
>
> ------------------------------
> From: w7ldn at w7ldn.com
> Date: Sat, 17 Jan 2015 19:19:03 +0000
>
> To: App_rpt-users at ohnosec.org
> Subject: [App_rpt-users] simplex vs duplex for a home node
>
> Please excuse my ignorance on this. But one of the advantages of Allstar
> over say IRLP is the ability to operate full-duplex. My understanding on
> this is limited. But apparently full-duplex is not possible without setting
> up a repeater.
>
> Since many folks seem to setup nodes in their residences... is it common
> for them to have repeater setups that allow them full-duplex operation at
> home? Is there a relatively cheap/easy way to do this?
>
> Any tips are very appreciated.  :)
>
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