10B     xxxx    xxxx    80
        10C     xxxx    xxxx    40
  JJY/WWV (1)   xxxx    xxxx    20
        160     oooo    xxxx    15
                xxxx    oooo    < X5 the "11 meter" socket
                ....    xxxx    10A

The xtal was ordered from Marden Electronics (800-222-6093) although it is probably available from the other companies which offer this type of item. I'll skip the business details here, but it is cheap. I found fat fingers a hindrance when yanking the old and insterting the new so I used a hemostat (narrow nosed locking type device with "seconds" often found in hardware stores, etc.). After checking with a local ham who monitored my transmissions to make sure I was where I thought I was, I was in business with 12 meters for my FT 101B.

How'd it go ?? After warming up the rig, I spun the dial a bit on what has been a mostly dead band this summer. The first station I heard was a little weak .. AA5QC .. no it's A35QC. I had no idea where that was, but I gave him a call. It turned out to be JF1WQC vacationing in TONGA, my first African contact and a 59 report at that! So here's an easy way to add a WARC band and open new possibilities for DX adventure with your FT 101 series rig. Please let me know if you have any additional feedback or comments on what has to be one of the easiest "mods" ever.

(1) This is another story .. note that it is a receive only band for 10 Mhz .. for now. See Page 70 of the Nov 83 issue of 73 Magazine if you can't wait.
 

In addition of that I have to say that tuning these transceivers is not a trouble for me, and also that up to now all the servicing needed by my3 tubed transceivers ( 2 Yaesu FT-101 ZD and 1 Yaesu FT-102) has been performed by my self.

One day I noticed in one of the Yaesu FT-101 ZD a little hum which could be heard at minimum volume level and when the radio was switched to transmission with the PTT. Tt wasn't a great trouble but when you want to have things working as better as possible you are forced to try finding the problem.

The first suspicious were the electrolytic capacitors of the power supply, and they were all replaced by new ones, even the pair of 200 uF, 500 volt, on the high voltage rectifier, but unfortunately the hum was still there.

Then the following step was to checkthe final audio amplifier located in the PB 1964 af unit, replacing the output module UPC2002, but no improvement was obtained.

After checkingthe parts around this module I could verify that the problem was in the 2 wire shielded cable connecting the input of Q01 (UPC2002) to the potentiometer of volume in the front panel.

I desoldered this 2 wire shielded cable at potentiometer end and connect there, two new 1 conductor shielded cables, soldering together the braids of these wires at the af board end to a good ground point, for instance to a solder lug inserted in the screw fixing the UPC2002 to the board.
Then I desoldered one end of the resistor R06 4.7 K and the negative end of C07 1uF and soldered there the corresponding wires from the potentiometer

After this operation the audio hum was removed.

I suppose this hum could be picked up by the original shielded cable along its way to the volume control

Best 73'S
EA4BQN
 

1. Remove the topcover of the transceiver case, as shown in Fig. 1.
   
    
2. Refer to Fig. 2, and locate the NB-FIX circuit board. Remove its mounting screws, because this board is obstructing the removal of the IF unit.
   
    
3. Remove the 12-pin, 13-pin, and 15-pin plugs from their sockets on the IF unit. Remove the IF unit mounting screws, and remove the IF unit from the transceiver case.
   
    
4. Install the optional CW filter as shown in the foil side view of the IF unit (Fig. 3). Make the fastening nuts snug, and solder the pins of the filter to the circuit board, and remove the 2 jumper wires shown in Figure 3.
   
    
5. Re-install the IF unit, being careful to connect the 12-pin, 13-pin, and 15-pin plugs in the correct sockets. Refer to Fig. 2 to be ure. Re-install the NB-FIX unit, and replace the top cover of the transceiver.
   
    
6. When the optional CW filter is installed, the CW-N position of the mode switch will activate this filter. In the CW-W position, the SSB 2.4 kHz filter will be in use. The WIDTH control is usable in all modes.

On 10 meters the Transmitter takes off on HF or with the tranverters being used. The problem is dry joints or earthing points around the 12BY7. The fix is to Solder points on and around the 12BY7 printed circuit board.

Fault blows main fuse every 1/2 to up to 6 hours and is not the 6146b's flashing over. There are vertical type caps in PB-1988 and the internal fluids run down and ark across the narrow gap in the caps ( screen supply ) ( a common problem in TV sets ) Replace caps in screen supply PB-1988 C1001,C1002,C1003 and C1004 ,10 uf 450v.

Replace 1000pf from the plate of the driver valve to the grids of the 6146b 's. This is a precautionary measure as the FT101 series had problems here.

The NB stops working sometimes. It appears to be a dry joint on plug pins or the Noise blanker/ crystal lock board . The fix is to solder around the connections the above printed circuit board.

Fault the RX and the TX stop working except on narrow cw position. The fault was a dry joint on the crystal filter XF01 on the IF board. I found out that this radio had been used mobile a lot down rough dirt roads. The filters are heavy and in the center of the PC board so solder around the rest of the filters on the IF board.

The transmitter stops working. The band change switch is in two parts. Its is joined where in goes into the 6146b compartment from a steel shaft to a fiber shaft. This becomes loose and the bands do not line up properly. It is a good precaution to mark with a marker pen and tighten the screws on the band change switch extension.
I heard from one FT101zd repairer spending days tracking this one down.

The FT101zd is designed for the FTV901 series of tranverter via the 11 pin ACC socket. The Plate, screen and bias voltages are not always wired to the ACC socket. This is needed if you want to run the FTV650b 6 meter transverter that is designed for the earlier FT101 series. Especially the MK3 model did not have the above wiring. Both the FTV250 and FTV650b can be used with this mod on all FT101zd's.

Modifications and faults collated from around ZL by ZL3MH