Topband: Collins 75A4

[James D. Jorgensen]

The following data for the Collins 75A-4 were presented in a talk at the 1979
W9DXCC Meeting and are attributed to Bob Sherwood.

Measurements done at 500 hz bandwidth.

Noise floor:  -143.5 dBm
Intermodulation:
@20 Khz
dynamic range: 66 dB
3rd order intercept:  -44.5 dBm

@2 Khz
Dynamic range:  tone
3rd order intercept:  -- (I think this means it couldn't be measured)

Blocking dynamic range:
@ 20 Khz:  95 dB
@ 2 Khz:  tone

Sideband noise:
Level below the noise floor:
@ 20 Khz:  blocking
@ 2 Khz:  tone

AGC range:
0 to -100 dBm, input dB:  1.5

As you can see, the intermod and blocking characteristics are not very good,
especially at close spacing.

Best wishes,
Jim, K9RJ