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#Post#: 82--------------------------------------------------
Grant-XL (8719 PLL) 10 KC Jump Modification
DIR By: kycbradio
Date: October 5, 2018, 4:00 pm
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Grant-XL (8719 PLL) 10 KC Jump Modification
Basically, you need to either add voltage or ground pin #16 on
the MB8719 PLL.
Here's how to do a 10 Kc UP jump only:
1. Cut trace to pin #16 on the PLL.
2. Install a 4.7K resistor across the cut you made.
3. Using a SPST switch, one side of the switch goes to the
cut-side of pin #16
4. The other side of the switch goes to pin #9 of the PLL. (8
volts)
When you apply the 8 volts, this pulls pin #16 high causing the
10 kc jump up.
This will not work on all channels.
For a 10 Kc DOWN jump only:
1. 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 too will not work on all channels.
For a 10 Kc UP and DOWN switch:
Perform the trace cut/resistor addition described above.
Use a SPDT switch and wire as follows:
1. Center of switch goes to pin #9 of PLL (8 volts)
2. One side of switch goes to the cut side of pin #16.
3. The last side goes to pin #18 of PLL (or ground)
This will allow you to jump 10Kc up or down.
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