REPRESENTATIVE TEST DATA


Signal Input to: Frequency Input Output Remarks

(a) Junction of 1,000 c/s 0.8V 50mW in 3 ohms AUDIO GAIN MAX.
A.F. LEVEL MAX.
C218 and C221B 1,000 c/s 1.0V 10mW in 600 ohms R.F.&I.F. GAIN
(output to line) MIN. B.F.O. off.
LIMITER off.

(b) Grid V16 100 kc/s c.w 360mV 100µA r.f B.F.O. off
level
Grid V14 100 kc/s c.w 850µV 100µA r.f SYSTEM switch
level MAN. R.F./I.F.
GAIN MAX.
Socket SKT303 100 kc/s c.w 800µV 100µA r.f 1 Mc/s and 1.7
level Mc/s crystals
removed.
V.F.O. switch
set to EXT.
Mc/s scale set
to 20. BAND-
WIDTH 3 kc/s.

(c) Grid of 2.2 Mc/s c.w 25µV 100µA r.f. 1 Mc/s and 1.7
second mixer level Mc/s crystals
(TP3) 2.5 Mc/s c.w 25µV 100µA r.f. re-inserted.
level V.F.O. switch
2.9 Mc/s c.w 25µV 100µA r.f. set to INT.
level Image response
(i.e. receiver
frequency plus
200 kc/s) should
be at least 60db
down.

(d) Aerial input 3.5 Mc/s c.w 250mV 0.5 at TP2 WIDEBAND 75-ohms
(WIDEBAND INPUT R.F.
75-ohms) ATTENUATOR MIN.
V5 and V7 removed.
Valve voltmeter
input shunted to
12pF.

(e) Aerial input 3.5 Mc/s c.w 250mV 0.5 at TP3 WIDEBAND INPUT
(WIDEBAND R.F. ATTENUATOR
75-ohms) MIN.
V5 and V7 refitted.
V9 and 1 Mc/s
crystal removed.
Valve voltmeter
input shunted to
12pF. MEGACYCLES
scale 3.

(f) Grid V10 37.5 Mc/s c.w 100µV 1V at TP3 V9 and V5 and 1
Grid V8 70µV Mc/s crystal re-
TP1 8mV moved. Valve volt-
meter input
shunted to 12pF.

(g) With the 1 Mc/s crystal in place, the output at socket SKT2 should be
approximately 2 volts.

(h) The level of the 37.5 Mc/s drive at TP3 should be between 2 and 10 volts
at any MEGACYCLES setting.


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