05-19-2018, 09:58 PM
Arran - You have a point about the comments - and I think they don't quite reflect the qualities of the radio.
The emphasis on stability is important when considered in relation to the good IF image response rejection offered by the ~40 MHz IF band. This is where the ingenuity lies - although high frequencies are generated and used within the set to up-convert the incoming signals, any oscillator drift is cancelled again in the down-conversion scheme. One free-running oscillator is still required for the final mixer stage.
Much of the enthusiasm for these sets will originate from the fact that they were British, and we love our own stuff
. I'd love to try out one of these sets, and know folk who have owned them in the past and remembered them fondly. They are a design classic that established a company which went on to design some really good communications equipment for military and commercial use.
Cheers
Ed
The emphasis on stability is important when considered in relation to the good IF image response rejection offered by the ~40 MHz IF band. This is where the ingenuity lies - although high frequencies are generated and used within the set to up-convert the incoming signals, any oscillator drift is cancelled again in the down-conversion scheme. One free-running oscillator is still required for the final mixer stage.
Much of the enthusiasm for these sets will originate from the fact that they were British, and we love our own stuff
. I'd love to try out one of these sets, and know folk who have owned them in the past and remembered them fondly. They are a design classic that established a company which went on to design some really good communications equipment for military and commercial use.Cheers
Ed
I don't hold with furniture that talks.
