-----Original Message----- From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users- bounces@ohnosec.org] On Behalf Of Bryan D. Boyle Sent: Saturday, November 24, 2012 11:51 AM To: app_rpt mailing list Subject: [App_rpt-users] Interesting problem
I have a simplex node (that I finally got working...); alinco DR135, that I use as an occasional link from my node(s) into the local club repeater (trying to demonstrate for them the wonders of asterisk...).
The DR135 is set up for digital input, levels are ok, keying off the ptt on the rear connector. I can connect ok, get good modulation in both directions, PL works fine (i'm taking flat audio out of the 135 and injecting back in with asterisk handling the pl generation, etc.)
Anyway...have an interesting problem that cropped up...when I connect the 135 to ANY of my 2 hubs or nodes and confirm the connection...my transmit side (listening on the transmit frequency of the link radio), when I key
You say 'underneath' the transmit audio, so I am guessing it is a low volume level tone. I have had various hums/tones show up that I eventually traced to ground loops. Use of switching supplies for the computer and radio make for lots of interesting "notes". The URI has no transformer isolation, so is particularly susceptible to this, under certain circumstances. The cure was simple and effective: a short heavy wire between the computer chassis and the transmitter chassis. 73 Ken KE2N the
135, has a 1KC tone underneath the transmit audio.
I've checked (via radio-tune-menu) that the 1KC tone is off, all the configurations are saved properly, etc. This ONLY happens when I connect the DR135 up as a simplex link; it does not happen between any of my other repeater nodes.
It's a bit of a quandry...wondering what this could be. Any thoughts?
BB
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