Receiver local oscillator tracking.

After calculating L and C component values, program OSCTRACK allows the main
2(or 3)-gang tuning capacitor to be varied over its full range, sweeping
frequency between the band edges, simultaneously displaying the tracking
error in kilohertz or as a fraction of the received tuning frequency.


The multi-gang circuitry and calculations were devised in the 1920's with
the advent of the Superheterodyne Receiver and the 1930's multi-grid
frequency-changer tubes. All had to be extremely tediously worked out with
slide-rules or log tables. Just think what the old boys could have
accomplished had this program then been available.
----
.................................................. ..........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. ..........

"Reg Edwards" wrote -

Superhet receivers.

For design of RF and local oscillator tuned circuits, L and C values for
correct tracking, download program OSCTRACK from website below in a few
seconds and run immediately.
---
.................................................. .........
Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
.................................................. .........

Reg Edwards wrote:

Receiver local oscillator tracking.

The multi-gang circuitry and calculations were devised in the 1920's with
the advent of the Superheterodyne Receiver and the 1930's multi-grid
frequency-changer tubes. All had to be extremely tediously worked out with
slide-rules or log tables. Just think what the old boys could have
accomplished had this program then been available.

I wouldn't be surprised if Edwin Armstrong could do it in his head.


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Receiver local oscillator tracking.

The multi-gang circuitry and calculations were devised in the 1920's
with
the advent of the Superheterodyne Receiver and the 1930's multi-grid
frequency-changer tubes. All had to be extremely tediously worked out
with
slide-rules or log tables. Just think what the old boys could have
accomplished had this program then been available.

======================================

I wouldn't be surprised if Edwin Armstrong could do it in his head.

======================================

To solve the problem of calculating the four values of the trimming and
padding capacitors, two coil inductances, for given capacitance of the main
two-gang tuning capacitor, and for given edges of the frequency band,
involves the solution of four simultaneous quadratic eequations.

Edwin would have needed the assistance of at least a pencil and an empty
cigarette pack.