[arm-allstar] Newbie hardware node builder, looking for elmer that I can ask questions or advice.

[kd4ont]

Thanks. I will try this test. My main goal is to make an 888s repeater AND a dtmf mic and internal speaker in the node box. I want the ability to use an ht around the house or use the node box like a base station. I want the repeater idea because I need to be able to tx without needing the repeater, on either side, to drop before I can key up. The target repeater has allstar mixing with the rf side. The setup I'd like is full duplex with zoiper as a rx on the phone. That way, if I key up with the ht, and someone keys on their side, I can hear it and unkey and let them talk. I already have zoiper set up on my node. I'm slowly gathering parts like used in g7rpg's videos. 
I know this might sound bass ackwards to those trying to figure out why in the world would anyone want to do that?!

-------- Original message --------
From: David McGough via arm-allstar <arm-allstar at hamvoip.org> 
Date: 04/06/2017  12:52  (GMT-05:00) 
To: John Hoser-Smith via arm-allstar <arm-allstar at hamvoip.org> 
Cc: David McGough <kb4fxc at inttek.net> 
Subject: Re: [arm-allstar] Newbie hardware node builder,
  looking for elmer that I can ask questions or advice. 



Hi,

I'm running a "backyard" 888 repeater right now. I've simply got the RX 
radio on the stock whip antenna and the TX radio runs into a dummy load, 
via a half-wave section of poorly shield (cheap!) RG-58 coax.  This combo 
works well for short range coverage (a few hundred feet). The radios are 
oriented 180 degrees apart from each other---so, the TX connection is at 
one end, the RX at the other. This affords some isolation.

If you're trying to get "neighborhood" coverage (maybe 1500 ft radius), a
pair of 888 radios run into a notch-only duplexer will work. Or, split 
antennas would probably work, too. I purchased a cheap Chinese notch 
duplexer off ebay and found its performance on par with similar 
name-brand units.

I wouldn't recommend trying to extend a 888 repeaters range beyond the 
neighborhood, they're not the right solution if you're building a real 
repeater.  ....But, for short range use, they work great!

73, David KB4FXC



On Thu, 6 Apr 2017, "John Hoser-Smith via arm-allstar" wrote:

> KD4ONT:Â  My first question is: with a g7rpg suggested mod for 
milliwatts output, with a 888s, what band split should I use that the rx 
would not be taken out by the Tx.
>N0ECT:  I operate several Allstar Nodes and (1) IRLP node.  All Simplex 
>and a PL Tone on TX.   We have one Allstar Node that connects (UHF) to 
>an old fashion (FM) Repeater Backbone - there we use different Tx and Rx 
>to match the Repeaters frequencies.  If you're planning a simple/basdic 
>Allstar Node - might want to consider Simplex.   My 2 cents


 

    On Thursday, April 6, 2017 1:05 AM, kd4ont via arm-allstar <arm-allstar at hamvoip.org> wrote:
 

 I reached out to Peter, g7rpg. Waiting for a response. Is there someone that I could ask hardware software questions, when I see a road block, that wouldn't mind directing me to good solutions? I know asking "stupid" newb questions, out here, might be good, but bore the rest of you.
My first question is: with a g7rpg suggested mod for milliwatts output, with a 888s, what band split should I use that the rx would not be taken out by the tx. I know the 888s has a rx as big as a barn door. Would a cross band setup be better with these chinese radios at very low tx power?
I'm piecing together my first hybrid node. A tx rx and dtmf mic node. This is for only around the house setup. I want to be able to use the dtmf mic and speaker, like a base station, AND OR, use a mini repeater for wireless usage around the house.
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