Circuit Description; Frequency Configuration - Kenwood TR-751A Service Manual

TR-751A/E
CIRCUIT DESCRIPTION
MODEL
UNIT
TR-751A (K, M1, M2)
TR-751E (W, T)
FINAL UNIT X45-1490-11
X45-1490-11
CONTROL UNIT
X53-1460-11 (K, M1)
X53-1460-21 (M2)
X53-1460-51 (T)
-_X53-1460-61 (W)
COMPOSITE UNIT
|
Table 1 TR-751A/E PC board chort
FREQUENCY CONFIGURATION
The TR-751A/E utilizes a PLL synthesizer system in-
corporating
a digital
VFO, which
covers each
band in
50Hz steps. (See Fig. 1.)
455kHz
Item
Nominal frequency
10.695MHz_
Within 2200Hz at 6d8_
|'2.2kH2 or more at 6d8
| Witt +1.5kHz at 20dB
Within #2.4kHz at 608
Allowable center freq' deviation
Pass bandwidth and
attenuation bandwidth
(based on minimum loss).
Ripple 7 248 or less
Minimum loss | SdB or less
(Composit unit (RX) XF1)
5 : 2sc2714(¥)
MIXER
Qn
1as0~te6 ome
10.6935MHz
10.6965MHz
L PLL SYSTEM ] 10.24Mtz
é T oWax : 10.c035mHe
"AR OSC
;
iz l CW-TX = 10.69¢3MH2 J
133.305~137.295MHz
10.695MHz
XF (RX, TX common)
10.695MHz rl
+
| MIXER
Fig. 1 Frequency configuration