Modifications for the Yaesu FT-817

Picture(s) of Yaesu - FT-817

02-01-2001 Battery mod for ft-817 English language
20-01-2001 Extended TX for FT-817 English language
18-03-2001 Hidden menu for YAESU FT-817 English language
07-04-2001 FT-817 Tips German language
23-05-2001 YAESU FT-817 Servicepoints English language
10-07-2001 Improvement of the ALC - better modulation and throughput English language
10-07-2001 Improvement of the optional microphone MH-36 E8J with DTMF English language
28-08-2001 AGC modification for FT-817 English language

02-01-2001
Battery mod for ft-817

Yaesu folks want you to buy the 9.6 vdc battery pack and do not recommend you attempt to charge batts. from the included "stock" alkaline pack.
They have even rigged the pack so it will not charge. Poking around with a VOM I discovered that there is a way to make the alkaline pack charge. Pull out the pack and peel the tape off of the end with the wires.
You will find 2 red wires, 2 black wires and a green wire. cut and insulate the green wire. Put Nicads or NiMh Batteries in the the pack and set up the charge time circut. I have done this with no problem. This keeps you from breaking the bank buying alkaline cells and give you portable batt. power.

Two words of caution:

As with all mods, the warranty is affected, do so at your own risk.

By during this mod you have now disabled the protection feature and can re-charge alkaline batts.
This could be dangerous and messy...be careful not to do that. Of course with this mod, you will have little reason to use alkaline cells.

Enjoy. I look forward to hearing about other ft-817 mods for this nifty little rig.


From Bill - WA6CCA

When you do the "green wire mod" on the FT-817 to permit charging of internal NiMH or NiCad batteries, it's very important to install fuse protection or you could ruin your motherboard (a VERY expensive mistake).

Perhaps the easiest way is to install a 2-3 amp Pico fuse in line with the positive (red) wires leading to the battery pack. Better still, put another Pico fuse in line with the negative (green) wires also.

Bill
WA6CCA

This modification is read 2639 times.

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20-01-2001
Extended TX for FT-817

Important note from mods@mods.dk I have not this radio by myself, so i can verify the modification by myself.

About the photo, i have received messages that telling me that the numbers order should be reverse, so that the smallest number (1) should start from the left side, and not the right side.

Have you done this modification with success, then please mail to mods@mods.dk what you did, and have you follow the numbers order from the photo.?

  1. Remove the front panel

  2. Look down on the back of front panel, with the VFO knob just left of center. Look at the jumper locations just above the VFO knob on the circut board. Solder the first four jumpers and remove the solder at location five.

  3. Reassemble the radio, and reset the cpu by pressing the HOME and the power button.

Photo by Henry Kenealy Hank@foreignservice.org

This will extend the xmit freqs. on HF,VHF and UHF


Another mod.

The following Yeasu FT-817 frequency expansion modification is identical to the version provided by the manufacturer for MARS/CAP application.

  1. Remove any power or battery from the Radio.

  2. Remove the 14 screws holding the top and bottom covers to the radio.

  3. Remove the battery cover latch.

  4. Remove the covers.

  5. Remove the BNC retaining nut.

  6. Carefully lift the 4 plastic tabs holding the front panel to the chassis and slightly move the front panel forward.

  7. Disconnect the ribbon cable that connects the chassis and the front panel.

  8. Remove the jumper at location on Front Panel (J4005)

  9. Press and hold the "VFO/MR" key and the "F" key while turning on the radio.

  10. Reassemble the radio.

Note: The manufacturer states that "this modification opens up transmit coverage for MARS/CAP ONLY!" Other published modifications also have the user bridge the "first four jumpers". The difference between the two modification schemes has not been tested by the author.

Proceed at your own risk.

AA7W

pigeon3@gte.net

This modification is read 6193 times.

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18-03-2001
Hidden menu for YAESU FT-817
Author: Noel - ON7XV - noel.vdb@worldonline.be


Just push and hold A, B and C simultaniously while putting the rig on, and you're in the hidden menu with about 57 settings.

Number 5 for the 2 meterband will increase sensitivity while increasing he numbers; Default setting / 79.

To leave the menu just push and holf the F function just as the "ignition" switch will do .

It works...
Noel - ON7XV - Belgium

This modification is read 9070 times.

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07-04-2001
FT-817 Tips
Author: Volker - DL6OBU@qsl.net


Hallo liebe FT-817 Fans,

ich bin seit kurzem zufriedener Besitzer eines solchen Gerätes und möchte hier ein paar Tips loswerden, die entweder aus dem Internet stammen oder auf meiner eigenen Meinung beruhen.

Bevor es ins Eingemachte geht eine wichtige Anmerkung-ein besonderer Schwachpunkt ist das Batteriefach:

Beim Herausnehmen der Batterien ist darauf zu achten, daß diese nicht den Bodendeckel berühren. Dieser ist an der Seite, wo die Batterien darunter verschwinden, extrem schlecht entgratet. Es gibt leicht Kurzschlüsse nach Masse, wenn die Plastikhülle der Batterien beschädigt wird.
Dies ist besonders unangenehm bei der Bestückung mit Accus, weil diese einen "guten" Kurzschlußstrom liefern. Ich empfehle eine starke Folie dazwischen zu legen.

Grundsätzlich sind VOR dem Öffnen des Gehäuses auf jeden Fall die Battereien zu entfernen und eine externe Spannungsversorgung abzuklemmen!!!

Tip1- Betrieb mit Accus:

Das Batteriefach kann natürlich auch mit Accus bestückt werden. Wer die Accus nicht extern, sondern mit dem internen Timer laden möchte muß den grünen Draht, der zum Batteriefach führt irgendwo unterbrechen und die Enden isolieren, damit ein Accu erkannt wird. Wer wegen der Garantie eine reversible Änderung vorzieht kann im Stecker den entsprechenden Pin mit etwas Geschick und einer Nadel herausholen.
Weil der Yaesu-Accu nur 1000mAh hat und es für weniger Geld bereits 1600mAh NiHy Accus gibt kann ich das nur empfehlen! Beim Laden der Accus ist zu beachten, daß eine geeignete Ladezeit im Menü gewählt wird. Der Ladestrom ist etwa 170 mA.
Nach Ladeende fließt ein Erhaltestrom von 15 mA, es dürfen also keine Trockenbatterien mehr eingelegt werden wenn eine extere Spannungsversorgung erfolgt!!!

Tip2- Erweiterung des TX Frequenzbereiches zum Betrieb mit Transvertern

Hierzu ist zu sagen, daß im Internet Meinungen existieren, daß sich nicht alle FT-817 erweitern lassen- dies scheint zumindest bei den für den japanischen Markt gebauten zu stimmen. Mein Gerät, Serien-Nr. 1C20nnnn, mit CE-Zeichen, war in der Hinsicht freundlicher.

Den Lieferzustand habe ich nicht exakt in Erinnerung, auf KW / 6m waren es die DL Amateurbereiche und auf VHF / UHF erheblich mehr. Nach der u.a. Änderung ergab sich folgendes Bild:

TX: 1,8 - 33 MHz überall max. 5 Watt

TX: 33-56 MHz, 140-154 MHz, 420-470 MHz hier fällt außerhalb der USA-Amateurbänder die Leistung ab.

Die ARS-Funktion ist außer Betrieb, was (mich) aber nicht stört- man kann den Repeaterbetrieb und die Shift weiterhin von Hand einstellen. Der 1750 Hz Tonruf bleibt erhalten.

Nun zur Änderung:
Batterien entfernen (s.o.)
Alle Schrauben von Bodenblech und Deckel (nicht die direkt am Lautsprecher) lösen. Dann die beiden Bleche entfernen. Hierbei bitte beim Bodenblech den Riegel für das Batteriefach im Auge behalten- die zwei Federn sind schnell weggesprungen!

Wenn man schon mal die Deckel ab hat kann man auch mit einer Feile den Grat beim Batteriefach entfernen...

Das Flachbandkabel zur Frontplatte lösen, hierzu muß dessen Verschluß an der Platine vorsichtig hochgeklappt werden. Die Frontplatte nach vorne lösen, dazu die vier Plastikklemmen anheben.

Die Reihe mit den neun Lötbrücken ist leicht zu finden. Bei mir waren sie folgendermaßen gebrückt: =0=0=====

0 heißt dabei geschlossen und = offen

Mit: 0000===== ergibt sich die oben beschriebene Variante.

Vorsicht beim Löten, etwas Erfahrung sollte man schon haben um keine unerwünschten Kurzschlüsse zu produzieren!

Ganz wichtig- Nach dem Zusamenbau muß unbedingt der folgende Reset durchgeführt werden:

Die F und V/M Tasten gleichzeitig festhalten und den FT-817 einschalten. Dabei werden leider alle Speicher und Einstellungen gelöscht !

So, nun noch eine Frage zum Schluß:
Der Ft-817 ist ja angeblich "PR-tauglich", hat schon mal wer die Umschalt-zeiten (TXDelay) gemessen- sind sie wirklich für 9600Bd in einer vernünftigen Größenordung ???

73 de Volker in Hannover,
packet: DL6OBU @ DB0CEL.#NDS.DEU.EU
e-mail: DL6OBU @ QSL.NET
19.03.2001, 17:32:05 (Local Time)

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23-05-2001
YAESU FT-817 Servicepoints
Author: DL5GBL


(push A/B/C synchron and start device)

Number;Content;Point;Declaration;
1;HF1RXG RX GAIN;1.8MHz;181;
2;HF2RXG RX GAIN;7MHz;91;
3;HF3RXG RX GAIN;21MHz;123;
4;50MRXG RX GAIN;50MHz;66;
5;VHFRXG RX GAIN;144MHz;90;
6;UHFRXG RX GAIN;430MHz;117;
7;SSB-S9 SSB S-Meter;S9;70;
8;SSB-FS SSB S-Meter;FS;59;
9;FM-S9 FM S-Meter;S9;76;
10;FM-FS FM S-Meter;FS;109;
11;DISC-L FM Center;Meter;35;
12;DISC-H FM Center;Meter;69;
13;FM-TH1 FM;Squelch;82;
14;FM-TH2 FM;Squelch;82;
15;FM-TI1 FM;Squelch;14;
16;FM-TI2 FM Squelch;14;
17;VCC Power Supply;Voltage;138;
18;HF1-IC Over-current Protection;1.8MHz;111;
19;HF2-IC Over-current Protection;7MHz;116;
20;HF3-IC Over-current Protection;21MHz;111;
21;50M-IC Over-current Protection;50MHz;113;
22;VHF-IC Over-current Protection;144MHz;126;
23;UHF-IC Over-current Protection;430MHz;113;
24;HF1-HI RF Power HI;1.8MHz;116;
25;HF1-L3 RF Power L3;1.8MHz;67;
26;HF1-L2 RF Power L2;1.8MHz;21;
27;HF1-L1 RF Power L1;1.8MHz;4;
28;HF2-HI RF Power HI;7MHz;119;
29;HF2-L3 RF Power L3;7MHz;65;
30;HF2-L2 RF Power L2;7MHz;21;
31;HF2-L1 RF Power L1;7MHz;3;
32;HF3-HI RF Power HI;21MHz;117;
33;HF3-L3 RF Power L3;21MHz;63;
34;HF3-L2 RF Power L2,21MHz,20;
35;HF3-L1 RF Power L1;21MHz;2;
36;50M-HI RF Power HI;50MHz;115;
37;50M-L3 RF Power L3;50MHz;64;
38;50M-L2 RF Power L2;50MHz;23;
39;50M-L1 RF Power L1;50MHz;1;
40;VHF-HI RF Power HI;144MHz;140;
41;VHF-L3 RF Power L3;144MHz;93;
42;VHF-L2 RF Power L2;144MHz;28;
43;VHF-L1 RF Power L1;144MHz;12;
44;UHF-HI RF Power HI;430MHz;103;
45;UHF-L3 RF Power L3;430MHz;68;
46;UHF-L2 RF Power L2;430MHz;21;
47;UHF-L1 RF Power L1;430MHz;9;
48;HF1TXG TX Gain;1.8MHz;67;
49;HF2TXG TX Gain;7MHz;62;
50;HF3TXG TX Gain;21MHz;67;
51;50MTXG TX Gain;50MHz;89;
52;VHFTXG TX Gain;144MHz;79;
53;UHFTXG TX Gain;430MHz;69;
54;HF1POM Power Meter Sensitivity;1.8MHz;71;
55;HF2POM Power Meter Sensitivity;7MHz;72;
56;HF3POM Power Meter Sensitivity;21MHz;71;
57;50MPOM Power Meter Sensitivity;50MHz;70;
58;VHFPOM Power Meter Sensitivity;144MHz;83;
59;UHFPOM Power Meter Sensitivity;430MHz;64;
60;ALC1-M ALC;Meter;204;
61;ALC-M ALC;Meter;125;
62;HF1-RV Reverse;ALC;1.8MHz;13;
63;HF2-RV Reverse;ALC;7MHz;11;
64;HF3-RV Reverse;ALC;21MHz;21;
65;50M-RV Reverse;ALC;50MHz;15;
66;VHF-RV Reverse;ALC;144MHz;7;
67;UHF-RV Reverse;ALC;430MHz;28;
68;CW-CAR Carrier;Level;CW;252;
69;AM-CAR Carrier;Level;AM;210;
70;DEV-W;FM;Modulation;211
71;DEV-N;FM;Modulation;103;
72;M-MTR;FM;Modulation;188;
73;CTCSS;FM;Modulation;151;
74;DCS;FM;Modulation;129;
75;LSB-CP;SSB;Carrier Point;-19;
76;USB-CP;SSB;Carrier Point;-20;

Proceed at your own risk.

73 from ron, dl5gbl

This modification is read 14049 times.

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10-07-2001
Improvement of the ALC - better modulation and throughput
Author: Andreas Duessler - Andreas.duessler@t-online.de


Hi ladies and gents,

The FT-817 is a lovely rig, isn´t it? This is a radio one must have - without special reasons. But anyway, when I got the radio one week ago, I started to test it against excisting others. (like TS-870). Everything was quite okay, but the output in SSB is not reaching the 5W-mark, even when the CW-tone and in FM the rig runs on specified power. I walked through the curcuit-diagram and found the reason. The capacitor C1113 on the mainboard is too small. This has to be changed to bigger values. In my case it´s now 470 uF insted of former 1uF.

To find the place inside the rig .... boy! This took some time. But after locating the place, it´s now easy to descibe:

Open the upper side (where the loudspeaker fits) and locate the red jack on the rear side. Inside a flatband-cable comes up and is connected. Right beside this cable you find C1113, but it´s not labeled. But anyhow, look for the pictures taken and I´m sure you find the place. The new C is visible in the lower right corner of the picture (big and black) I removed the original C from the board before - but it´s still not necessary.

After finalizing, close the rig and test the output in SSB in comparison to FM and CW. The throughput is now there. And believe me, you get better voicereports. And running qrp - it´s sometimes the needed peace of junk !

Click to enlarge (335 Kb)

Click to enlarge (92 Kb)

Best wishes and good luck !

Andreas
DL6EAT

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10-07-2001
Improvement of the optional microphone MH-36 E8J with DTMF
Author: Andreas Duessler - Andreas.duessler@t-online.de


Hi ladies and gents,

The original microphone works good, but I tested also the DTMF-microphone, which is available now. It sounds really bad, and that wondered me, because a small electret-microphone is inside. But after opening the mic, the reason was easealy located. The necessary DC-voltage, comes to the microphone via a small resistor. The value of this resistor is by far too low - replace it to a value near 10 Kohms.

Now the microphone is better than the original one and has all these options like DTMF and it´s backlighted !

The picture should help to locate the small resistor. The new one is a traditional one ( I had no SMD-resistor )

It looks bad, but it works fine....by the way the new microphone is very sensitive now...go down to values of 20 (original is 50 !) in the setup of the FT-817 specially in SSB.

Good luck !

Andreas
DL6EAT

This modification is read 18440 times.

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28-08-2001
AGC modification for FT-817
Author: Andreas Duessler - Andreas.duessler@t-online.de


Hi YL´s XYL´s and OM´s,

Regarding the AGC (RX) of the FT817 I got some questions from some users. The dynamic of the AGC-regulation isn´t really nice researched. If you use the rig specially on 40m and/or 80m where often high signal strenths are present, the RX sounds like the AGC is switched completely "off". If using with small signal amplitudes it sounds much better. This seems to be a general problem of the FT817.

To fix this is only recommened for let me call it "advanced users". The rig has to be opended on the upper side (where the loudspeaker fits). Now you remove all connected cables from the visible main board and all srews. After this you can remove the board.

Please turn the board to the soldered side and locate C1324, which is nearest to the connected data-cable going to the user-interface (front panel).

Near this C you find R1305. Original values are 1 K and 2,2uF.

Now the mod:

Please put 10 Ohms in parallel with R1305 and 10uF parallel to C1324.

Please be carefull in doing this, the SMD-parts are very small !

In my case, I had no SMD-C available (and I didn´t want to use Tantal-C´s), therefor I connected the 10uF via cable to the upper side of the main board. It´s not looking nice, but nevertheless it´s working.
Values over 10uF (470uF) are better, but the S-meter stand still at approx. S6-7 afterwards. It´s not recommended to go over 10uF.

Good luck and again: be carefull!!!

Thanks for reading this and I apologize for the picture, which is not exactly focused. (I saw it too late...)

Click to enlarge (83 Kb) Click to enlarge (115 Kb)

Andreas
DL6EAT

This modification is read 20937 times.

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