[aprssig] RF Modules for GPS data transfer

[Wemanis Morgan]

Hi Andy!

I did a quite simple, but effective thing when i had some similar "problem" with G3RUH wirh DRCI SCC card..

The problem is probably in the receiver output.. use HEX inverter with RxD and DCD to have a clean "new" RxD.

This perhaps give you some ideas to solve it..
http://www.qsl.net/eb7cjo/mods/g3ruhdcd.txt

(or google for "sm6tky g3ruh")
73 de Morgan, sm6tky

________________________________
From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Andrew Rich
Sent: Wednesday, May 23, 2007 2:09 PM
To: Aprssig
Subject: [aprssig] RF Modules for GPS data transfer

An obesrvation:-

1. I started sending NMEA data over 433 MHz OOK (on off keying) with some success.

2. Now I am trying radiometrix modules, which seem to work great with 100% data throughput

but

when you are not sending data, the module puts out gibberish.

I am wondering if I shud be keying up the TX and using the carrier detect on the rx to get the thing to work properley.

I was under the impression a 1 or a 0 applied would swing the module to an idle state.

comments ?

I have gone from OOK to FSK.

Cheers

Andy VK4TEC
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