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LF
Decca mods info
Hi Band Model 5501 E
Measuired L= 66uH on orig freq
C = 23.7 nH
therefore to retune to 137 Khz needs a 150 nF capicator in
series with existing C result 137.0 Khz
This is the most convenient model to modify for the LF
BAND
If you are fortunate to have one of these models, you
could be in business after a couple of hours.
Specified drive is 4.5 volts sq or sine wave although some
extra drive is an advantage say 7 - 10 Volts
If you have a spare PA capacitor board for the lower freq
units there are plenty of 150 nF capacitors for the mod.
These amplifiers and individual units ( 3 per amp) are
easily modified for any freq of interest 600, 160, 80 metres and maybe even
40 metres. Each individual unit will produce around 400 Watts at around 67 volts
into a 71 ohm load or alternatively use 60 volts into a 50 ohm
load.
More info available if needed
73 de mal/g3kev
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