[arm-allstar] additional tx gain on RPI ? DR-1X interface

[Doug Crompton]

Neil,

 Are you using the DMK URI? If so follow the info on the DR1 mod in the howto's on the hamvoip.org web page to add additional gain by adding the internal op-amp into the circuit. It involves a couple of jumpers on the URI. I used 5V to power it from the 5V connection on the URI but if you need more gain you can run it from an external 12V source. On the DR1's I modified using 5V a setting of 950 on tx gain with preemphasis worked well.
73 Doug
WA3DSP
http://www.crompton.com/hamradio


From: k8it at cac.net
To: arm-allstar at hamvoip.org
Date: Sat, 17 Oct 2015 21:50:17 -0400
Subject: [arm-allstar] additional tx gain on RPI ? DR-1X interface








Is there any variable that I can adjust to get a higher level output on 
transmit? it is not a receive level issue as all spoken outputs are very low. 
like *70 for example. I ran my tx gain all the way up to 999 in duplex=2 but 
levels are very low. I am trying to interface a RPI  to a new Yaesu DR1X 
repeater using an optional ARCCOM  DR1X interface cable. All plug and play 
no modifications to void the warranty of the DR-1X
 
Just low tx audio!
 
Also I noticed I need a longer delay upon tx keyup so the first part of a 
message is not missed
is there such a variable?
TX KEY UP LEAD TIME=xxxx  ?     ;a delay after tx 
keys up before messages etc start speaking?
 
Thanks
73 Neil Sablatzky  K8IT
Allstar Node 41838 
KITLINK
Allstar Node 42087 KITLINK HUB
IRLP Node exp0068
Echolink 
K8IT-L
WIRES-X K8IT 11479 Room 21479



 

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