2SC1674 PDF

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Author cannot verify these modifications to work. All mods on this page are representing the last Grant XL pc board before being discontinued. Always check radio operation in all modes and settings after performing any modification. PLL Modifications Information for image above 1. Locate pin 14 of the chip on the bottom of the circuit board. Cut the trace for pin carefully. Solder a 4. Obtain 3 micro spst switches and find a suitable mounting area on the radio and install.

Switch 2 requires wiring to pin 10 and the board ground. Switch 3 requires wiring to pin 9 across from 10 and to the chip side of the cut trace on pin Next, solder the anode end of a 1N diode to pin 11 of PLL.

Next, solder the cathode banded end of a 1N diode to pin Next, solder the remaining diodes as shown and wire them on the switch just like the diagram shows.

And finally, you will have to put the wires on the switch. Ground pin 16 using a SPST switch. No cut to the PLL is necessary. Pulling pin 16 low will cause it to jump down 10Kc. This will not work on all channels. Clarifier Mods Slider Some info may be repeating, but with some differences. Find R and jump it. Take this wire andsolder it to Ground. Then solder it to pin 3 of the mb ic. This should give you about 6khz of slide. Unlocking the Clarifier 1 Remove D52 and R You should see about 5 khz of slide.

Find D52, R44 and R and remove them. Solder a jumper from where you removed R 3. NOTE: Some radios have different colored wires on the clarifier control. The Tx will track exactly with the Rx 1. Make sure to retune again after radio has been on for many hours. The 2K resistor can be larger or smaller depending on the range you prefer from your fine control.

Decrease the value to increase the fine range and increase the value to decrease the fine range. Power output and Audio Modifications 1. Add a 1. Replace R 10k with a 4.

Re-tune coils L36 and L38 for maximum forward swing on AM mode. I suggest putting a few ferrite beads over both wires that run to the switch. Mount switch on back of radio. Remove C a 2. AGC Modification 1. On underside of board, solder wires to both the negative and positive points to C23 3. Observe polarity! Find Q this is a 2SC Changing Q14 to a 2SC will produce higher amplification of weak signals, and a lower noise floor.

The actual transistor in the circuit can produce noise in your recieve-This mod will not take away noise that is being received from the antenna. It only lowers the noise floor that is produced within the radio. If you have a receive noise problem, this mod may amplify your problem! Too much adjustment will defeat the purpose of the better transistor- If you have to adjust at all, tune L4 and L6 more than L5 Most people that have done this mod say that after the transistor change, tuning was not needed.

The gain will improve anywhere between db with the same signal to noise ratio. The transistor pulled from Qsc will work VERY well in place of the Q19 2sc single sideband detector transistor. Only do this if you have upgraded Q14 to another transistor. Pull Q a 2sc and replace with a 2sc Component Upgrades always updating- check in again Find Q This is the AM regulator-2SC and is rated at 2.

Replace with a NTE rated at 7. C18 is a uF 10v electrolytic change to a uF 16v electrolytic. Change the uF 25v Electrolytic capacitor- no. C to a uF 35v or 50v electrolytic capacitor nearest the transformer Resistor no.

Place jumper across R Your XL will now dead key Ready to hook-up a Freq counter?

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