GB3EY operational
Posted: Sat Dec 18, 2021 11:07 pm
GB3EY was returned to service after repair and upgrade at 1530 UTC 18/12/2021
The repeater has had the following work done to it:
Clive G3GJA / G8EQZ
The repeater has had the following work done to it:
- 1. Replacement RA18H1213G module used as driver to the PA; original was dropping gain intermittently by 4dB
2. Transmit chain gain optimised; one pre-driver removed and bias adjusted to reduce shoulders and improve linearity
3. Larger, more powerful fan fitted to PA heatsink; cooling improved for summer months
4. Tx inter-digital bandpass filter fitted to improve isolation and eliminate desnse
5. Pre-amp between duplxer and Rx bandpass filter changed from PGA103 to Kuhne unit previously used on the old analogue repeater
6. Ryde external audio amplifier gain increased; s/n on audio improved
Clive G3GJA / G8EQZ