Recommended TRX2A modification

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Recommended TRX2A modification

Postby OH7SV » 13 Dec 2014 09:06

In some TRX2A units the GAIN BLOCK A9 on the Main Board can be overdriven which may cause splatter.

To avoid possible splatter there is an easy modification by adding one resistor and one capacitor to the unused pads on the All Band PA Board.
This modification increases the PA gain and thus gives more headroom for the OPAMP A9 on the Main Board.
After this modification the output power must be reduced back to 10W with the SSB GAIN and CARRIER gain trimmers.

See the All Band PA modification A4 www.jumaradio.com/juma-trx2/rev-b/trx2- ... a-sch.html

73 Matti OH7SV
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