(Frequently Asked Questions)
for the Yaesu FT-847 transceiver

Last Updated 21-Juli-2007

The initial version of these FAQ-pages were maintained by Jay, K1UC and were given to my hands (Peter, DH1NGP). These FAQs are intended to answer some questions about the FT-847, particularly those that seem to appear repeatedly on the Bulletin Board. It is not complete, and only reflects those topics with which the author is familiar or those reported by other knowledgeable hams. Please send any errors, corrections, or suggestions to Peter, DH1NGP. Your postings to the web page have made the information in these FAQs possible, so please advise Peter of any additional FAQs or corrections to the information shown here. Please note that many of the FAQs have updates appended to them with more recent information. When you refer to a FAQ, take at look near the end to see if there are any updates for it. You can also check the revision log to see what changes have been made to the FAQ.

You can use either your browser's Back key or the [Return to Main Menu] buttons to get back here.

[Return to the SuperControl CAT software Homepage]
[Return to the SuperControl Bulletin Board] >> fixed link<<
[Show Revision Log]

[DX-ZONE voting - If you think that this FAQ is of interest to you, then please vote a >>10<< !] >> new <<
>> new << = New or Changed Item Since Last Revision


[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M]
[N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]

ALC Control of RF Power Output
Alignment Menu
    Reports on the Alignment Menu
    Typical Alignment Menu Settings
AM Transmissions, Setting Mike Level Properly
Amplifiers, Linear
Antenna Connections
ARS, Loss of after transmit range modification
ARS on 10m & 6m
AT-11 Auto Tuner
ATAS-100, General
    ATAS-100 Menu 31 Setting Reverts to TUNER setting
    Radio Hangs Up in TUNER Mode
     Homebrew Control of ATAS-100 motor - Direct Link to URL
Backup Battery, Replacement
Cabling, Problems with Jumpers and PL-259 Plugs
CAT Cable Between Rig & PC
CAT Control Operations
CAT Software for the PC
Chattering or Clicking Relays, Display Dims on TX
Chattering Relay fix (Modification)
Clarifier, Characteristics
Cloning or Saving Radio Configurations
Control Panel & Display Locked Up!
Crossband Operations
CTCSS Issues
Data Port (see Digital Operations)
DC Power Cord
Digital Operations, General
    Data In/Out Port
    FM Packet Port
    Connecting your TNC at 9600 bps & 1200 bps
    Interfacing with Various Controllers
    Mike stays open when using Data In/Out Port for Transmitting
    Sound Cards & FT847
     DOX interface from Sept. 2000 QST
    Interfacing FT-847 to IBM Thinkpad
DIN, Mini- source for plugs for Amp Control
Display Dims on TX, Chattering or Clicking Relays
Display Locked up, Control Panel Doesn't Work, TX Locked on!
DOX Interface from Sept. 2000 QST
DSP, Digital Signal Processing, General
    Digital Filter
    Noise Reduction
    Notch Filter
    "Clicking" sound when turning
Duplexers for FT-847
Fan Issues, General
   Zener Diode Fix
Gang the fans fix
Disconnect fix
Replacement fix
   Fan speed controller (thermostatic)
FC-20 Auto Tuner, General
   Matching range
Workaround for Matching Range Limits
CAT Control & FC-20 Conflicts
Workaround for CAT & FC-20 Conflicts
    Information about using the CAT interface and the FC-20 tuner at the same time
Filters (see also INRAD filters)
Frequency Questions, General
   Frequency Accuracy
Tweaking Reference Oscillator Frequency
Frequency Stability
Front Panel Disassembly (for working on headphones or replacing power switch)
Frozen Display & Dials
FT-100 FAQs Page by K0LEE
Full Break-in, or QSK
Grounding Problems
Headphone Volume
INRAD Filters (see also Filters)
Interface "OTT-847" for the use with the FT-847 transceivers and LDG Antenna tuners
Internal Keyer For Practice
[J] [K] [L]
Linear Amplifiers for FT-847
Manual, Errors in Owner's Manual
Manual for the FT-847 transceiver online download possibility in Adobe PDF format
Memory Backup Battery Replacement
Memory channels, number of
Mike Stays Open when transmitting in Digital Mode
Microphone Options, General
    Stock Microphone
    Other Mikes for FT-847
Mobile Mount

Modifications for the FT-847, General
    AGC-Off modification from Peter Frenning, OZ1PIF (external link) >> new <<
    Chattering relay fix, complete modification sheet from Jochen Heilemann, DG2IAQ
    Fan speed controller (thermostatic)
    Opening up transmit range.
    Power switch modification from Dirk Schray, DL8UA (external link) >> new <<
    Loss of ARS after transmit range modification
Separate Receive and Transmit for 2m & 70cm

Modification for Strange Noises on 432
Modifications for the FT-847 transceiver on www.mods.dk (external link)
Noise Blanker Operation
Noise Reduction, Discussion
Noises, Strange, and Other Weird Things
Null Modem Cable
Open Mike Problem when Transmitting via Data In/Out Port

Online Users Manual for the FT-847 transceiver in Adobe PDF format

OTT-847 interface (by W4RT) to control LDG automatic antenna tuners
Overload, Receiver, from nearby commercial stations
Owner's Manual, Errors
Packet Radio (see Digital Operations)
Polling Codes for Frequency & Mode
Power, limiting maximum output power
Power cables, hooking up backwards
Power Cord, Replacing, Connectors*
Power Output, Control using ALC
Power Supply Problems
Power Switch Modification
Power Switch Problems
Power Switch Repair in 10 minutes
Power Switch, Replacing
Power Switch, Replacing Only the Inner Parts
Problems and easy solves
    Input inhibited - Transceiver locked and FT-847 goes into transmit mode No. I
    Transceiver automatically goes into transmit mode No. II
     Transceiver automatically goes into transmit mode No. III

Problems with early models

    Fixes by Yaesu under warranty
    Fixes not entertained by Yaesu
PSK31 Operations
    Using a narrow CW filter on PSK31
     "DOX" interface for Soundcard Operations
     simple-do-it-yourself-interface for PSK31
QSK CW Operation
Raspy or FMing audio reports on SSB
Receive range, limitations on some versions
Receiver Overload from nearby commercial stations
Relays Chattering or Clicking, Display Dims on TX
Relay Chattering fix (Modification)
RIT, Characteristics
Roger Beep circuit for the FT-847
Satellite Operations
    Speech Processing in Satellite Mode
    Desense Problems in Mode J
    Menu #36 Action on Satellite Memories
    Crossband Operation in Satellite Mode
Scanning Features
Serial Numbers - What do they mean?
Service Manual
Software for the PC
    Software for the Mac
Sound Cards, Interfacing to FT-847
Split Mode operations
Sub-tune, characteristics
Switch, Power, Replacing
Switch, Power, Replacing only the Inner Parts
SWR Indicator
TNC Interface Problems on 1200 & 9600
Transmit Stuck On, but No TX Audio
Tuner (see FC-20 Auto Tuner, AT-11 Auto Tuner from LDG)
Tuning knob wobble
User Manual for the FT-847 transceiver in Adobe PDF format
Voice synthesizer (FVS-1A)
Volume control issues
VOX-There is none
[W] [X] [Y] [Z]
Yaesu, How to Contact

Entire contents Copyright 2007 by Peter Pfisterer, DH1NGP