RigPix Database NCX-5 Transceiver Instruction Manual

NCX-5 Transceiver

Product Information:

The product being referred to is the NCX-5 MK II transceiver.
The user manual mentions several changes that have been made to the
schematic and components of the transceiver. These changes have
been incorporated in all NCX-5 MK II transceivers, but are not
recorded on the schematic.

Some of the changes mentioned in the user manual include:

1. Trimmer CS has been shown incorrectly between pin 9 of V4A and
   ground. It should be shown between pin 7 (plate) of V4A and
   ground.

2. The VFO and BUFFER transistors have been changed. The new VFO
   transistor is an RCA 40245 and the BUFFER transistor has been
   changed to a 2N2672 (Amperex).

3. The type numbers of diodes D14, D15, D16, and D17 are not
   called out on the schematic. They are all type 1N541 diodes and
   should be ordered as matched pairs with the order number
   1N542.

4. Capacitor C222, located in the grid circuit of tube V10, is
   printed incorrectly and should be changed to read C212.

5. Capacitor C221 should be shown as a 0.33 uF, 400 V capacitor
   instead of 0.47 uF.

6. The value of Capacitor C48 in the ALC DETECTOR circuit is shown
   incorrectly. Its value should be 0.15 μF.

7. Resistor R137, 1K, in the grid circuit of V15 is not present
   and should be removed from the schematic.

8. The Carrier Balance circuit has been changed.

9. Resistor R15S, 22K in the grid circuit of V10 has been changed
   to a 220K resistor.

Product Usage Instructions:

When using the NCX-5 MK II transceiver, please follow the
instructions provided in the user manual. Additionally, take note
of the following changes and corrections:

1. Ensure that Trimmer CS is shown correctly between pin 7 (plate)
   of V4A and ground.

2. Be aware that the VFO transistor has been changed to an RCA
   40245 and the BUFFER transistor has been changed to a 2N2672
   (Amperex).

3. When ordering diodes D14, D15, D16, and D17, make sure to order
   them as matched pairs with the order number 1N542.

4. Replace Capacitor C222 in the grid circuit of tube V10 with
   C212.

5. Replace Capacitor C221 with a 0.33 uF, 400 V capacitor.

6. Ensure that Capacitor C48 in the ALC DETECTOR circuit has a
   value of 0.15 μF.

7. Remove Resistor R137, 1K, from the grid circuit of V15.

8. Take note of the changes made to the Carrier Balance
   circuit.

9. Replace Resistor R15S, 22K, in the grid circuit of V10 with a
   220K resistor.

Please refer to the figures provided in the user manual for a
visual representation of the changes mentioned above.

ADD~NDA TO THE NCX-5 MK II MANUAL AND SCHEMATIC
A. The following changes affect the schematic only. These changes have been incorporated in all NCX-5 MK II transceivers, but not recorded on the schematic.
1. Trimmer CS, was shown incorrectly between pin 9 of V4A and ground. It should be shown between pin 7 (plate) of V4A and ground as seenzyxwvutsrqpo
in figure #1.
2. Resistor R74, 47K ± 10% 1/2 watt between pin 9 of V4A and ground
should be shown as a 4.7K ± 10% 1/2 watt resistor.
C8
LOC. OSC. V4A
~ 6KE8
8
F IG U R E zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBANOTE “‘1

CI95 22
10%

R74 4.7K 100/0

…,_ SEE NOTE #”2

3. The VFO and BUPPER transistors have been changed in all NCX-5 MK II transceivers. The new VFO transistor is an RCA 40245 and the BUFFER transistor has been changed to a 2N2672 (Amperex).
Changes should be noted in Section 4 and figure #2 of the
NCX-5 Instruction Manual.

-2-
4. The type numbers of diodes D14, D15, D16, and D17 are not called out on the schematic. They are all type 1N541 diodes. These diodes are in matched pairs and should be ordered as matched pairs. The order number for each pair is 1N542.
5. Capacitor C222, 0.01 uF (located in the grid circuit of tube V10), ~s printed incorrectly and should be changed to read C212, 0.01 uF.
6. A 0.01 uF ceramic capacitor should be shown between pin 8 of the calibrator socket and chassis ground. A 100 Q ± 10% 1/2 watt resistor should be shown between pin 8 of the calibrator socket and the calibrator switch (5-7).
7. Capacitor C221, 0.47 uF should be shown as a 0.33 uF, 400 V capacitor.
8. Resistor R133, 6.8Kzy±xw1vu0t%srq1p/o2nmwlkajithtgfeadccbraoZsYsXWLV- 4UTSsRhoQuPlOdNMbLeKJsIHhoGwFnEDaCsBA R133, 4.7Kzyx±wvu1ts0rq%pon1m/lk2jihgwfeadctbtaZ.YXWVUTSRQPONMLKJIHGFEDCBA
9. Resistor R132, 15K ± 10% 1/2 watt, should be shown as a 10K ± 10% 1/2 watt resistor.
10. A 150 Q ± 10%, 1/2 watt resistor should be shown between ground and the ground end of the RF gain control (R-4).

– 3 -zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
11. The value of Cap~citor C48 in the ALC DETECTOR circuit is shown incorrectly. Its value should be.O.15 ~f.
12. Resistor R137, 1K, in the gdd circuit of V15zyisxwsvhuowtsnrqipncoonrmrelcktjilhygfedcbaZY in the schematic. The schematic should be changed to agree with figure #2.

I CI60
.01

R60 560
012

1 .CI09 01
gr
13. Resi st.or R150, 6.8K in the plate circuit of V10 has been omitted and should be removed from the schematic.
140 The Carrier Balance circuit has been changed. The schematic should be changed to agree with figure #3.
Ol~

RI60 120

FIGURE 3

– 4 -zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
15. Resistor R15S, 22K in the grid circuit of V10 has been changed to a 220K resistor.
16. Capacitor C159, 100pfzy±xwv1u0t%srqpionnmtlhkjeihggferdicdbaZcYiXrWcuViUtTSRoQf PVO1N8MA,LKJhIHaGsFEbDeCenBA changed to a 4?Opf ± 10% Capacitor.
17. Resi stor R160, 10K 10% in the plate cireu it of V6A has been changed to a 47K 1/2 watt ± 10% Resistor.
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