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• Down band - This will go down 1 band (45 channels).
• Up band - This will go up 1 band (45 channels).
• NZ band - This gives the New Zealand band, which is 63 channels below the FCC band (63.5 to be precise, clarify to 26.330).
• UK band - This gives the UK 40 band which is 64 channels above the FCC band and is 40 consecutive channels without the Alpha channel hops (clarified to 27.60125, FM radio needed).
• 10kHz shift - All radios will have a 10kHz shift, for most it is +10kHz, for one type it is a -10kHz shift.

• PCBM121D4X
• PCBM125A4X
• PCBM131A4X
• PCBM133A4X
• PCMA001S
• PTBM027AOX
• PTBM033AOX
• PTBM036AOX
• PTBM038AOX
• PTBM039AOX

1. Check for the correct binary code at the PLL pins, see note earlier in manual.
2. Decide what bands you require the board to produce (see note below), set the jumpers and cut the tracks on the EPROM board and to match.
3. Decide how you are going to control the new bands, existing panel switches, new toggle switches, replacing the rotary band switch (only for pros !) etc.
4. Cut the tracks that go to pins 15 through to 8 (or 7, see note on next page first !) to isolate them from the channel selector and jumper connections.
5. Solder the ribbon cable to the PLL pins (D0-D7, see picture later) and to the channel selector side of the cut tracks (A0-A6, see picture later).
6. Solder the EPROM board earth (0V) to pin 16 of the PLL of the any other good earth point on the main board.
7. Solder the +12V wire to the main radio supply, make sure that it is from after the on/off switch so that the board is not powered when the radio is turned off., On the PTBM131A4X board there is a PCB pin on the right hand side about half way back, it is marked as Ò10Õ and it is next to Q26.
8. Connect the board to the switches to select the required bands and functions.
9. Go back to step 1 and double check everything on each step.
10. Triple check everything, I mean it !

After doing this you should have the board connected to +12V, earth, 8 outputs from the EPROM to the PLL (D0-D7), 7 inputs from the cut tracks on the channel selector side to the inputs of the EPROM (A0-A6), the EPROM control lines connected to your switches:

A7 = DOWN band,

A8 = UP band,

A9 (+A7/A8) = NZ/UK,

A10 = +10kHz step.

Some radios may have slightly different programming, for radios with codes of 224-268 here are the differences:

A9 = UK band (others use A9 + A8),

A9, A8 and A7 = NZ band (others use A9 + A7),

A7 = UP band ,

A8 = DOWN band,

A10 = -10kHz

See the programming chart later in this manual for a completely comprehensive listing of control functions and binary codes required.

Testing and additional info

11. Turn the radio on and test everything thoroughly, all bands, both existing and new, Down band, Up band, NZ/UK and 10K shift on each.

Radios that use the PTBM133A4X board will need to activate the NZ band from band B (low band) and the UK band from band C (mid, FCC band) instead of NZ and UK being from the mid (C, FCC) band

Radios that have a code range of 255-211 and 210-166 (usually six band models) will not get any UP bands when using the 210-166 codes (bands B,D,F) , this is due to running out of programming options, also when on bands B,D and F EPROM pins A7 and A8 need to be pulled high at all times, this can easily be done using diode steering:

Attach a diode to each of the band positions for B,D and F, so that when the radio is in any of those bands the diodes will pass a voltage through a resistor to drop the voltage to the EPROM pins down to about 5 Volts (this is very important !), see the diagram for more information.

12. Tune or broad band anything that needs adjusting (see tips later in manual).

13. If all is OK and you did not make any mistakes, CAREFULLY heat shrink the EPROM board with the tube supplied, do not apply too much heat.

14. Close up the radio and enjoy your new frequencies !

Pictures and advanced info

This picture shows the EPROM board wiring diagram with its inputs (A0-A6) its programming/switch inputs (A7-A10, (or A l l if fitted with a 2732 EPROM) and the 5V, 0V rails), its outputs (D0-D7) and its power supply connections (+12V and 0V).

This diagram shows the diode steering that is required for use with radios with codes of 210-166 on bands B,D and F.

This picture shows the PCB jumpers that are on the board, as you can see the tracks narrow at a point where they are normally tied to ground, if you are not going to use 1 of the control lines leave the track intact, but if you are going to use 1 or more lines cut the track for the pin you are going to control.

For example, the top one is A8, which is used for the UP band, if you did not want to use the UP band (or UK band as it uses that pin also) you would not have to do anything.

But if you wanted to use the UP (or UK) band you would need to cut the track that goes between the pin and the earth track (the big thick vertical one on the right), then you can solder the control wire into the provided hole and attach the 0V and 5V control wires for it as well, the 5V rail is the one going down the left side, the 0V is the one that is horizontal above D7 and connects to the main earth track, you can also see the pads that allow the pins to be tied high without having to attach jumper wires if a pin needs to be programmed to be high all of the time, you will notice that for boards using a 2716 EPROM (most of them) the A11 track is cut and the pin is pulled high.

The picture below shows the pin-outs of the PLL as viewed from the track-side of the PCB, pin 1 of the PLL is at the top left corner and has a 5V supply going to it.

These pictures show various methods of band selection, any one of the switches can be omitted, the NZ/UK switch can be used without an Up / Down band switch, also you can have it set up so that it automatically turns on the Up (for UK) / Down (for NZ) band when you activate it (required for it to work), as longs as diode steering is used to select either the A7 (for NZ) or A8 (for UK) lines when activated.

Notes

PLL Pin 7 switching

For radios with a code range of 255-211 ONLY on all bands you can just attach pin 7 directly to the switch wire that goes to the EPROM for the Low band, this pin must be high on the Low and NZ bands and low on all others, this does it nicely on these radios !

For radios with codes of both 300-256 (L-Low and Low bands) and 255-211 (Mid,High and H-High bands) just leave the track alone do not cut it as it will give the correct voltage when needed anyway !

For radios with a code of 224-268 you must do a little extra work, when in normal bands (all extras turned off) pin 7 must be connected as normal as it changes from high to low in the normal range of codes, when the DOWN or NZ band is activated the pin must be low all of the time, so it must be disconnected from the track and pulled low, but when in the UP or UK bands it must be pulled high instead.

Radios that have a code range of 224-253 can just cut the track and control it by pulling it low in the DOWN,NZ bands and high in the UP,UK bands.

Broad banding

Most radios will not need it to be done, but you may need to, an easy way is to tune the radio for the upper frequencies (but as low as you can without problems) and then add the circuit below to the low bands to extend the tuning range of a problem tuning can, the PTBM131A4X board uses this type of circuit on its TX mixers !

Clarifier slide increase

The clarifier on most of the SSB radios gives about 5kHz of slide, which is enough for most purposes, but if you want to add a little more slide then add a 4.7 uH RF coil to the varactor diode, on the PTBM125A4X, PTBM131A4X and PCMA001S it is D6, on the PTBM133A4X it is D7, on the PTBM121D4X it is D1 on the crystal oscillator board (PTOS110AOX)

NATO 2000, UK FM Band

The NATO 2000 already has the UK40 as part of its own band structure,the binary code range of the UK FM band is 255-216 so it will work without any problems make sure that the EPROM is placed between the PLL and the two proms (IC601 and IC602), then just have the EPROM selected with normal mode (no extra bands enabled) to use the UK band, it will be unaffected by the presence of the EPROM board, but you will still gain a 10K shift, of course you can still use the UP and DOWN bands as well if you like.

+10kHz shift

For The Down band (and on the L-Low and Low bands of radios using a code of 300-256) the +10Khz shift will not work on Ch 40, this is due to the code changing from 8 bits to 9 and it is not worth the extra effort and expense for the sake of one channel that you can get by going to channel 1 on the next band up anyway !

EPROM band and function selection codes and programming

This section show you all of the possible programming arrangements with this EPROM and what input codes allow which outputs from the EPROM board, just look up the input code range(s) that your radio uses and look at the possible operating bands and programming information for the board.

* Important note !

A7 and A8 need to be pulled high at all times when in the 210-166 code range!

* code goes up to 253 for 23 channel radios.

*2 please notice the reversal of A7 and A8 and the different NZ/UK band programming for this code range.

Also notice the difference in 10 kHz shift, in this code range it is a -10kHz shift !

NOTE: the output codes may say a figure greater than 256, the EPROM can only supply a code as high as 255, that is why we must pull the PLL pin 7 high/low as needed to give the final code of over 256, for example, a code of 300 requires all 8 bits from the EPROM and 1 more bit (the 256 bit) to be high as well, so we pull pin 7 high as it is the pin for a code of 256, I hope this helps to explain it for those people who know that EPROM's only have a possible output code of 255.

Programming

Here are the general functions of the EPROM's A6,A7,A8,A9 and A10 inputs (may vary with input code range of radio, see above chart for more details):

A6 = 7th line of programming from channel selector, also is responsible for correct codes, normally just tied high or connected to 7th line of the channel selector output.

A7 = Down band selector (Up band for radios using 224-268 code range).

A8 = Up band selector (Down band for radios using 224-268 code range).

A9 = NZ/UK band selector (used in conjunction with A7 (NZ) and A8 (UK)

A10 = + 10 kHz shift (- 10kHz shift for radios using 224+268 code range).

Calculating the binary code

If you do not know how to calculate the binary number (also known as N code) read this.

So if pins 8,9,11,14 and 15 where high (at 5V) and the rest where low (at 0V) you would have a binary code of 211 (128+64+16+2+1=211), you just ignore the pins that are low.

Example modification

1. I checked the PLL pins and found that it only used 1 set of codes, 255-211.

2. I decided that I only wanted to have a 10 kHz shift and the Down band.

3. I checked the programming chart and found that for a code range of 255-211 the 10 kHz step uses A10 and the Down band uses A7.

4. I cut the A7 and A10 tracks on the EPROM board (at the thin part of the track) to disconnect them from 0V which allows me to control the inputs on those pins.

5. I cut the tracks on the radio PCB for PLL pins 15-7.

6. I made available the switches required for the new functions and wired them to the EPROM board as shown below, the Down band switch is also switching the PLL pin 7 high when on, this is to increase the binary code on the 9th bit as the EPROM only has 8 outputs:

            +10kHz   Down band    <---Switch function
              ___       ___ 
   0V <======|=O=|=====|=O |      <---Function OFF(switch up)
   A10 <=====|=O |     | O=|====> A7 and PLL pin 7
   5V <======|=O=|=====|=O |      <---Function ON (switch down)
              SW1       SW2 

7. I connected the EPROM inputs to the channel selector side of the cut tracks as shown below (this is for A0-A5, A6 can be tied high at 5V on the EPROM board):

PLL pin number -->     15  14  13  12  11  10

Tracks ----->           |   |   |   |   |   | 

Cut in tracks --->     === === === === === ===

Tracks ----->           |   |   |   |   |   |

EPROM inputs A0-A5-->  A0  A1  A2  A3  A4  A5

Tracks ----->           |   |   |   |   |   |

Tracks ----->           |   |   |   |   |   |

Connections             |   |   |   |   |   |

to channel selector --> O   O   O   O   O   O 

8. I connected the EPROM outputs (D0-D7) to the PLL pins as follows:

9. Then I connected the power wires (+12V and 0V) from the board to the radio.

10. I double checked all of my wiring, checked that I had cut the tracks correctly on the EPROM and radio boards and that I had got the input and output connection the correct way around etc.

11. I slipped the EPROM board into its heat shrink tube to protect it.

12. I turned on the radio and checked for both normal operation and the new expanded functions I set up (+10kHz step and the Down band).

13. I checked to make sure that the EPROM board was not receiving a 12V supply after I turned the radio off.

14. All was working correctly so I applied heat to the heat shrink tube to finish the installation.

15. I did not need to broad band the radio, so I have finished the installation.

16. I closed the radio back up.

Trouble shooting

EPROM is not working at all

Check jumper on pin 21, for a EPROM marked as a 2716 the track to it should be cut and the pin should be jumpered to the +5V rail on the board.

Check that you have not miss-programmed the jumpers or switches, 1 incorrect jumper or selection setting could stop the EPROM from recognizing the binary codes

The radio does not use the correct binary codes required for the EPROM to work in it, see note about binary codes that are supported earlier in this manual.

Only some bands are working

There could be a mistake with the programming switches not giving the EPROM either a 5v or 0V signal, or a jumper has not been cut or added correctly.

You did not notice that the radio uses more than one set of binary codes and you have not set the switches / jumpers for the other codes.

Some channels do not work on a certain band

If there is a large gap of channels missing it may be a jumper or switch programming problem.

The EPROM may have been damaged by static electricity during handling.

The EPROM may have been damaged by incorrect wiring.

Note: All EPROM's are checked after I have programed them to ensure that they have accepted the programming information correctly and that the EPROM is not faulty.

E-mail me if you have any questions or concerns about installation.

All boards are installed at your own risk,
(it is not my fault if you make a mistake and damage your equipment).

I build and test these circuits myself before shipping them, so I know that the boards are working correctly when you receive them.