SWAN 350 and 400 PRODUCT DETECTOR MODIFICATION

Additional Parts Required:

(1) 1k 1/2 watt resistor
(1) 270 ohm 1/2 watt resistor
(1) 150 pf SM capacitor
(1) .22 µfd 200v capacitor

Remove:

1. L-1001 RF choke
2. C-1001 2 pf capacitor
3. R-1001 1 meg resistor
4. C-1002 .01 µfd capacitor
5. Ground lead from pin 3 of V-10A
6. Ground lead from pin 7 of V-14. Make sure that pin 2 of V-14 remains grounded. (V-15 on Swan 400)

Install:

1. L-1001 RF choke from pin 3 of V10A to vacant lug of terminal strip.
2. 1k resistor in series with L-1001 to ground.
3. 270 ohm resistor from pin 7 of V-14 to ground. (V-15 on Swan 400)
4. 150 pf SM capacitor from pin 7 of V-14 to pin 3 of V-10A.
5. 10k resistor from pin 2 of V-10A to ground.
6. .22 µfd capacitor from pin 8 of V-10B to ground.

Note: In some of the earlier models, pin 8 of V-10B is grounded. Remove ground and install 2.7k resistor from pin 8 to ground. Re-peak second IF transformer for maximum background noise.

Replacing R-906-270k with a 150k resistor will permit higher "S" meter reading. R-1104-27k can be replaced with a 2.7k 1/2 watt resistor for improved receiver audio.

This circuit is similar to that used in the Swan 500 and 250. It is not an official Swan Modification on the Swan 350, and is furnished for your information only.