26 March 2023: 9V1RMP UHF Repeater Maintenance Change log

 Published on the 28 March 2023 at 0200 Hours UTC

All Images and text cannot be reproduced without permission from 9V1FH / AI7GW, Fu Hang.

On 26 March 2023, I went to the 9V1RMP Repeater Site to do maintenance and add AllStarlink for Linking to 9V1RMP Repeater.

I arrived at the site at about 1720 hours when the scheduled time was 1700. Warmly welcomed by the Repeater Host, 9V1BH, Victor, on-site.

Checked all the RF connections for loose fitting.

Tested the Linking system, but the soundcard would not power after the repeater transmitted. 

The main issue is the USB cable which has a protection system where RFI is generated into the USB cable. The USB port protects the port by powering the device off.

My DB9 to DB25 connector wiring is also wrong, as I use the shield as a signal ground. Victor, 9V1BH will help with building the interconnection cable.

The linking system, the raspberry pi, and the soundcard must be in a metal box.

The Linking system is not installed. the repeater is in standalone mode.

All was working when I left the Repeater Site at 1130 Hours.

I've included some images below. All Images and text cannot be reproduced without permission from 9V1FH / AI7GW, Fu Hang.


The View in the direction of the antenna.

The whole UHF Repeater System

The 2 element UHF Yagi

ICOM FR6000

Diamond GSV1200

UHF Duplexer

Duplexer Connections

Inline SWR meter


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