LesComm

8719-192-L-PLCC EPT069610Z KIT INSTRUCTIONS

 

 

 

 NOTE: RADIO MUST BE IN ORIGINAL CHANNEL CONFIGURATION. ALL CHANNEL MODS MUST BE REMOVED AND COMPONENTS RETURNED TO ORIGINAL CONDITION.

 

 

Presteps;

 

DX959, 949, 939, 2547, Ranger 69X, 96X, Freedom-1, Replace X3 with the 14.730 xtal.

 

Install RA1 common pin to ground hole (pull down). NOTE; On boards assembled for specific radios, RA1 has already been installed the correct way.

RA1’s common pin is denoted by a dot above the pin.

 

EPT069610Z, Refer to figure 1. If your PLL IC is labeled like the one in this pic “RCI 8719-97”. Do not replace X3. Instead, leave the original crystal in place and connect A14 to +5 volts.

If your radio has the PLL IC labeled “RCI 8719-99” replace X3 with the 14.730 xtal.

In both cases, install RA1 common pin to ground hole (pull down).

 

 

 

 

 

Figure 1.

 

 

 

 

 

 

Take note of the connector labels. One pair is for the 959 style chassis (939, 949, 959, 969, 696, FD-1, 699, 2547 etc.).

The other pair is for the 979 style chassis, (919, 929, 979).

 

CAUTION! Connecting your radio to the wrong set of connectors could permanently damage your radio!!

 

 

1. Remove the top and bottom covers.

 

2. Unplug the multi colored cable, that comes from the channel selector board, at the main board.

 

 

Figure 3.

 

3. Plug the loose end into J1 of the LesComm board.

 

 

4. Connect the cable from J3 of the LesComm board to the connector on the main board you just unplugged the channel selector from.

 

 

5. Find a suitable place to install the band switch and the 10kc switch and mount both.

 

6. Mount the LesComm board.

 

7. Connect to power and power up the radio. STOP. Check for full coverage. If full coverage is present, you’re done. Replace covers. If not, proceed to step 8.

 

 

 

8. Place the Band switch in the D (4)  position, channel selector on channel 1.

 

9. Check for the frequency of  27.415mhz. If not present, using a digital voltmeter, measure the voltage on pin 17 of the 8719 PLL chip. (Should be approximately 4 volts.)

 

10. Connect the voltmeter to test point 1 (Cathode of D1) on the LesComm board.

 

11. Adjust VR1 to match the voltage you measured on pin 17 of the PLL, minus .3volts.

Example; If you measured 4.65 volts on pin 17, set VR1 for 4.35 volts at TP 1. 

Note: If using an MMB8719, set voltage .75 volts below pin 17.

 

12. Check for the frequency of  27.415mhz.

 

13. Switch to channel 40. Select Band A.

 

14. While measuring the voltage on pin 8 of the PLL, slowly go down in channels until this voltage becomes unstable and drops off. This is the lowest frequency the radio will cover. Usually around 26.325 on the 8719-97 PLL radio’s.  26.065 on the 8719-99 radio’s.

 

 

Reassemble your radio.

 

Enjoy!

 

 

 

 

 

 

 

Side Note; The RCI8719-97 is a 7 bit device, but the internals of the IC do not allow it to control the VCO as well as a -99. I recommend you replace it with an RCI8719-99 or MMB8719 and change the crystal. You’ll be much happier with the results. Also, remember if you do this, do not connect A14 to +5 volts.