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Old 12th Aug 2018, 11:13 am   #7
Dual Standard
Hexode
 
Join Date: Aug 2005
Location: Cheshire, UK.
Posts: 263
Default Re: Project Omega PCB's.

The QRO (100W) PA was delayed somewhat because attempts to use the then commonly available 2N608x devices proved to be all too easy to break and a redesign had to be done using a pair of TRW PT9784/A devices. The design was finally published in the January & February 1985 editions of HRT with a followup article in the April edition with additional details. Tony also offered an alignment and testing service for completed PAs.

The completed QRO PA & heatsinks can be clearly seen in one of the photos on my previous post but here is a better shot showing closeup of the PA & the TRW devices.
The perforated screened box contains the QRP PA/driver and the relay switched LPF is just visible on the rear of the aluminum screening partition. On the right hand side is the solid state T/R switch enabling full break-in, hence the rigs desirability for CW ops.
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