Hi,

I have quite a bit of info on this set, including pictures, circuits,
component layouts, model variants etc. Plus companion Tx, the T1154.

See http://www.zipworld.com.au/~sb/radio/

Simon VK2UA

On Mon, 13 Oct 2003 23:46:50 +0100, Joe McElvenney
wrote:

Hi,

Hi, can anyone tell me if the BFO freq on this set
runs at half the IF ie 280khz before I go mad
from Ron...

Yes, it does!

I guess they used the second harmonic to reduce the de-
sensitization that could happen if the BFO were at the IF
frequency and activated the AGC. It might also have helped to
reduce pulling of the oscillator by a strong IF signal.

A great receiver for its day although the build-state was
typical Marconi of the time. I think however, that the average
operation life of a Lancaster precluded the receiver ever
reaching old age.


Cheers - Joe

Hi,

I have quite a bit of info on this set, including pictures, circuits,
component layouts, model variants etc. Plus companion Tx, the T1154.

See http://www.zipworld.com.au/~sb/radio/

Simon VK2UA

On Mon, 13 Oct 2003 23:46:50 +0100, Joe McElvenney
wrote:

Hi,

Hi, can anyone tell me if the BFO freq on this set
runs at half the IF ie 280khz before I go mad
from Ron...

Yes, it does!

I guess they used the second harmonic to reduce the de-
sensitization that could happen if the BFO were at the IF
frequency and activated the AGC. It might also have helped to
reduce pulling of the oscillator by a strong IF signal.

A great receiver for its day although the build-state was
typical Marconi of the time. I think however, that the average
operation life of a Lancaster precluded the receiver ever
reaching old age.


Cheers - Joe

Hi,

Hi, can anyone tell me if the BFO freq on this set
runs at half the IF ie 280khz before I go mad
from Ron...

Yes, it does!

I guess they used the second harmonic to reduce the de-
sensitization that could happen if the BFO were at the IF
frequency and activated the AGC. It might also have helped to
reduce pulling of the oscillator by a strong IF signal.

A great receiver for its day although the build-state was
typical Marconi of the time. I think however, that the average
operation life of a Lancaster precluded the receiver ever
reaching old age.


Cheers - Joe