Ausserdem sollte die Modifikation nur mit einem ensprechenden SMD-Loetkolben durchgefuehrt werden. Mein FT-8000R arbeitet in 9K6 Packet nun so hervorragend, wie ich es eigentlich von Anfang an erwartet haette. Fazit: Geraete mit angepriesender, serienmaessiger 9k6 Data-Buchse sind damit noch lange nicht automatisch 9k6 faehig. Vy 73, Ulli (DL4YCM @ DB0BQ)
This modification is read 670 times.

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19-07-1998
(FT-8100) FT-8100 width 9600 baud packet
01-08-98 From: G3VEB@GB7OAR.#16.GBR.EU Hi All. Some stations have been asking if FT8100 will work on 9k6 without modification. Answer is yes, but if you use the YEASU CT39 connecting cable be sure to check it. I spent most of a day trying to get my 8100 and PK96 working, but with no success. As a last resort I checked the cable and found that the coloured wires to the pins in the 6 pin mini din plug were wrong. (see page 19 FT-8100 manual). I found pins 1 and 2 were tranposed which put the orange wire to gnd instead of the yellow. Pins 3 and 4 were also transposed making the green wire PTT instead of the red. Pins 5 and 6 were correct. Also check TNC deviation, it's more critical on 9k6 but a setting between 2.5 and 2.75 seems ok. 73.Roy
This modification is read 1730 times.

15-11-1998

(FT-8100) Mars/Cap Mod
1. Disconnect power & Antenna 2. Remove screws from the top cover (the side with the speaker) 6 screws total 3. Looking down inside the top of the radio, locate & remove the chip resistor shown in the picture 4. Reassemble the radio & reset the Microprocessor
This modification is read 2251 times.

02-12-2000

(FT-8100) FT-8100 RX 144 - 148 & 430 - 450 MHz mod
Author: Mac - mcgyv@hotmail.com.MODIFICATION.NET If you remove the Resistor Chip & Place it on the Solder pads Just directly above it (see pic below) it will make it so your radio can only recieve 144.000-148.000 & 430.000-450.000. However I don't expect you would want to do this mod anyhow.
This modification is read 2151 times.
(FT-8100) Software mods for the FT8100 ver:1.00 date 03/98
The FT8100 uses a little bit differend aproach for the up/download. It is not possible to change the Country Codes via Software. The firmware and EEPROM is a little bit bigger so a secure check can be done and if the Hardware configuration won't match, the FT8100 is refusing to accept the data file. There must be anyway either a Secret menu or at least 3 Jumpers for setting the country code. But as usually Software rules, so it is possible to move the lower and upper limits for RX and TX. With this way the FT8100 will FULL OPEN and can be used on all Frequencies for RX and TX where the Hardware will allow it. You will get a FREEBAND mod and the good thing is that the ARS will still work. To make the mod you will need the ADMS 2D Software and a HEX editor. Or you can download the allready patched.RDF file. It does not matter what Hardware mod you have (or have done) or for witch country your FT8100 is configured. Technicaly you are only moving the limits for the Frequecny dealing. Make a.RDF file and edit it with a HEX editor. The values on the following addresses are defining the lower and upper limits for RX and TX on the VHF and UHF bands

Band Lower limit adr Upper Limit adr =========================================== VHF RX 0A66 and 0B2A 0A6A and 0B2E UHF RX 0A76 and 0B8F 0A7A and 0B93 ------------------------------------------VHF TX 0A6E 0A72 UHF TX 0A7E 0A82 ------------------------------------------Value example: -------------VHF RX 0050

UHF RX VHF TX UHF TX

If you insert the values from the example in the abouve addresses, the FT8100 will be opened for RX and TX from 50280MHz and 280-650MHz. After modification the following results are mesured. RESULTS: Upload: Free.rdf & Stock.tpl
VHF: RX 50.00 to 109.995 TX red light active on 80.00 to 109 (notsure if it really TX'ing) Also all the digits "X" are flashing. Example: 50.XX to 109.XX Same as above, but has the "AM" displayed.Also all the digits "X" areflashing. But this is only between 110.XX to 111.XX twoards the 110.8 MHZ range, the flashing seems to slow down in "pulse" (not blinking as fast.) Does TX but not tested for RX on a scanner. the.630 starts to flash. The 201. does not flash. flashes, however still unknown if it is true TX but unknown if it is true TX TX.

RX 110.000 to 136.995

137.00 to 210.630 201.630
RX from 201.63 to 205.995 RX 206.00 to 280.00
UHF: RX 280.000 to 550.000 RX 551.00 to 650.000 TX light is on, but need to chek for true TX TX light is on, but need to chek for true TX, also 551.XXXto 650.XXX blinks NO TX

RX 750 to 869.00

When at 750.00 , if you cycle backwards.you end up at 550.00.rotate forware to get to the 600.00MHZ band
RX 894.00 to 1330.00 No TX
We are currently seeking others to help us test these mods for other countries & different production codes. If You have removed the resistor chip & lost it & want the stock mode back in your radio you will need to upload this Mars to Stock.TPL. This mod is a product of the intercontinental digital cooperation between:
Mazedonia - Ingra-Beton@t-online.de USA - mcgyv@hotmail.com
East and West, together on the Net.
This modification is read 2172 times.
(FT-8100) FT-8100R Cell Mod
First off you will need the Adams-2D software & a Hex editor. You will also need to know the Exact Mhz that you wish to program into your 8100R radio.Below is what you shoud get when you Hex Edit your *.rdf file
You first need to upload some Mhz, using the 900Mhz range is the easiest. I am using the following in this example:
433.0000 971.7625 971.1375 972.4000 973.0250 973.6625 974.2875 975.5500 976.1750 977.4375 981.2750 981.4875

= = = = = = = = = = =

871.7625 871.1375 872.4000 873.0250 873.6625 874.2875 875.5500 876.1750 877.4375 881.2750 881.4875

After you get the 900Mhz uploaded to the file, then you are ready to Hex Edit them into 800Mhz as shown on the right.
In the above picture, look for the first Mhz you entered. I searched for 9717 because I was looking for 971.7625 Mhz. The rest of the frequencies you need to change are just a few spaces off. Compare the picture below with the Mhz files from above. All you need to do is change the 9 into an 8.
You will see all the changes I made in RED. The second number does not get changed, but turns RED due to the fact that they are in pairs. Also the Red dots on the far right of the pic is automatically changed when you chang the number into an 8. Upload the file into your 8100R radio & you should have the Frequencies in the Cell band in your radio.
This modification is read 2309 times.

25-06-2001

(FT-8100) FT8100R frequent thermal failure - repair suggestion
Author: G8SBF - slarkins@yfi.co.uk.MODIFICATION.NET
Symptoms of this power track particular problem are:1. Loss of receive audio - even though the 's' meter still shows the radio is receiving OK. There is NO audio at all from the speaker on either band. 2. When you transmit the transmitter runs virtually no power as the Power Amplifier has no 13.8v feed. You cannot access even very close by repeaters etc. 3. The transmit fan on the back does not operate when you transmit 4. The radio may work for a short time when cold. When it heats up there is a 'click' from the speaker and it dies in the way described above quite quickly. If these are the symptoms you are seeing then solder a wire onto the top PCB as shown in the picture below (you'll need to scratch off the varnish on the tracks to get a good solder connection). Be careful not to short anything else out other than to attach to the tracks shown with the wire. Obviously where I put the bridging wire, those track positions should ALWAYS be connected together by an underside board track (and plated through holes), which you can't see unless you take the whole radio apart. I would not recommend you doing that as you need to be very careful and have a high wattage soldering iron to unsolder some of the earth solder tags. My radio is 100% perfect now. I can't take any responsibility if you do anything wrong and cause damage. Do this at your own risk. Martin Lynch want 90 pounds to do this repair. Considering it's a 5 minute fix that's an awful lot of money!! By the way, the 8100 board is a ten layer PCB so try not to heat it up for too long with the soldering iron and this is another reason why I recommend not taking the radio apart. You'll only need to take the top cover off and disconnect the speaker connector to do this repair - NOTHING ELSE. Apparently if you take the board out (not necessary) and bend the PCB you can cause other inner layer fractures. These problems are also common. If the symptoms you are seeing do not match those described - then you may have another track fracture somewhere. The FT8100 is also known for these faults.

This modification is read 2104 times.

08-09-2001

(FT-8100) FT8100 volume
Author: Sean (ZL2BOF) - sean.nixon@xtra.co.nz.MODIFICATION.NET
Hello, I have read a few reports about the FT8100 and one common complaint was the volume being stuck on one level when the knob was turned down. It happened to mine yesterday and was simple to fix.
Remove front control panel On the back of the front panel are two screws, remove screws and remove cover On the circuit board, push the flexi-strip connector towards the strip and remove the flexi- strip from the connector. Pull off the volume and squelch plastic knobs, and with a fine screwdriver remove the slotted nut that holds the volume knob in place. Press out the volume knob. It has a small circuit board attached to it, and this will pop off a small connector on the main circuit board. On mine the connector was so poorly soldered to the circuit board that it came off with the volume knob. This was the problem. Re solder the connector to the board and re assemble.
ZL2BOF Sean Date: 29-01-2002 Subject: UHF Squelch/Volume control The FT 8100 also suffers from intermittant faults on the UHF Squelch/Volume control. As with the VHF Sq/Vol remove front panel, plastic knobe and unscrew the control and ease the small PC board from its socket and resolder the contacts to the main panel PC. when reassembling ensure the securing slotted nuts are tightened full to ensure the control is secure to the front panel.
This modification is read 2162 times.

User comment

From: Alan Morgan G8PON

21-10-2001

(FT-8100) Yaesu FT8100R cheap or FREE !!! data conector & cable
Author: James EI2IV - ei2iv@gofree.indigo.ie.MODIFICATION.NET
Why spend loads of money or better still why spend any at all on expensive optional data cables. Just get your hands on an old PC PS2 Mouse n cut off the lead !!!!! (most mouse leads will do, the odd ones are missing 1 wire ) 73s James EI2IV
This modification is read 1933 times.

13-02-2002

(FT-8100) TX fix for FT-8100R

Author: Robin, G1MHU - robin@rmoseley.co.uk.MODIFICATION.NET
I had a problem with My FT-8100R, it would TX ok on 70Cm's but 2M side, power output would drop off to almost Zero when the radio was warm. After looking allover the PCB I found that one of the VIA's on the board was glowing in the dark from the minute arcing caused by the intermittent connection, I soldered a link wire from the VIA to the nearest component. Voila Problem solved. I e-mailed Yaesu UK, they tell me it is a common fault, so here is a jpg image of what was done to repair the radio. Robin Moseley G1MHU Date: 28-03-2002 Subject: VIA in the power module In my FT8100 all the VIA's after the power module were arcing. Even to such an extent that several components burned out. I had to replace all the coils, capacitors and diodes. To prevent this: scrape around the VIA's until you can seen bare copper. Insert into the VIA's a small copper lead, like the end of an resistor. Solder into the VIA and make sure the blank copper gets enough solder. This has to be done on both sides of the PCB, so you have to take it out of the tranceiver. Replace the final capacitor at the antenna connector, for a 1KV equivalent. These modifications are absolutly neccesary if you are running high power on two meters. I found out the hard way!!!! Mike PA3FPZ
This modification is read 718 times.

From: Mike PA3FPZ

(FT-811) MODS for FT-411/811 TRX for a VHF UHF