WA4GEG FT-1000MP Series Notes
Back to Main Page
Back to Repair Facts Page
ATU / Antenna Tuning Unit & Outboard Tuner Cautions
How-to reduce the risk of damaging your transceiver when making use of the internal antenna tuner:
1) FT-1000MP series: Keep menu 4-3 (TUNING DRIVE) set for no more than 50 watts of power (75W for the 200 watt Mark-V.)
2) Always measure your antenna's SWR before activating the internal tuner, i.e. RF Power set for about 10~20 watts, CW mode, and PTT your mic. and read the SWR on the transceiver's meter. Practice has shown that the tuner has difficulty handing non-resonate systems and an SWR close to or greater than 2.5:1, especially so with the 200 watt FT-1000MP Mark-V. Attempting to tune an out of range or otherwise non-tunable loads risks damage to T/R, ATU and expensive RF power amplifier components.
3) FT-1000MP, Mark-V and Field: If you don't normally use the internal antenna tuner, it is best to disable it by setting menu 8-8 to OFF. This will eliminate the risk of accidentally initializing the tuner by bumping the tuner's START button during otherwise normal operating activity.
4) Initializing the ATU into an open circuit (i.e. no antenna connected,) faulty and or intermittent load is a known cause for damaging the RF Power Amplifier and/or LPF Unit, especially for the 200 Watt Mark-V.
5) OUTBOARD TUNER WARNING: The 200 Watt FT-1000MP Mark-V is not bullet proof! Use extreme care when adjusting outboard antenna tuners. Most operators assume that it is safe to set the Mark-V for a low transmitter output power, and then wildly crank the knobs around on their outboard antenna tuner. Not a good idea! Such an incorrect technique is known to strain the Mark-V's QSK T/R switching. The QSK T/R switching is known to fault in certain situations, resulting in the destruction of components.
When adjusting external tuners the better method is to use an Impedance Bridge, such as one of the commonly available Antenna Analyzers, to find and log all adjustments for each band of interest. Thereafter the adjustment log is used as a guide to preset the tuner's controls to the proper range BEFORE transmitting a low power carrier to tweak the tuner. Following this method allows the impedance presented by the TUNER to the Mark-V to be within operating specifications of the transceiver's protective circuitry.
ROLLER INDUCTOR TUNERS are the most troublesome of all outboard tuners. The maintenance factor aside, high power "hot tuning" roller inductors is a concern for even the older more rugged vacuum tube transmitters, and even more of a concern for solid state transmitters. The problem being that the continuity of the aging roller inductor's moving electromechanical components seldom remain optimum, particularly while the roller is in motion. SWR spikes occurring while tuning roller inductors is a known cause for damaging solid state transmitters, to say the least.
FT-1000MP Mark-V (not Field)
WA4GEG's Receiver Antenna FUSE LAMP mod. (Tuner-Main update)
FT-1000MP Mark-V (not Field): The T/R switching circuitry is known to fault under certain conditions, most commonly when transmitting into high SWR, open circuit, faulty antenna system, and improper use of the ATU. The unfortunate end result is multiple component destruction on several circuit boards.
The addition of an antenna fuse lamp (pictured below) in the receiver's main antenna signal path will save $$$ in repair costs. This update modification is automatically applied to all Mark-V's serviced in my shop. The fuse lamp will also open and protect the receiver front end when dangerously high RF levels from a nearby transmitter enter the Mark-V via its main antenna input.
NOTE: This update can also be done (at nominal extra cost)
with a precision plug-in micro-fuse for a "no soldering" easy
DIY detail: Not visible as it is under
the lamp, the copper foil circuit path between the lamp's two
solder points is opened / cut.
Lamp specs: anything up to 14
volts will work. My preference is to use 5 to 6 volt lamps,
0.050 to 0.060 ampere.
If a lot of full power operation is anticipated on 15 through 10 meters, it is best to use two lamps wired in parallel
in the interest of lamp longevity.
For the no-solder / plug-in
version, that will typically use a micro fuse specification of
100mA to 125mA
In the course of servicing, and to properly align these transceivers, it is necessary to set certain user menus as follows. These settings also give the highest analog operating performance for the transceiver, including the best receiver SNR for all bands 160 through 12 meters. (For best 10 meter receiver *SNR, set menu 8-4 to tuned.)
4-4 TX Audio DSP EQ OFF
5-0 (only for **Mark-V & Field) OFF (OFF = 2.4 KHz filters ON, as odd as it seems)
7-7 EDSP modulation and demodulation OFF, OFF, OFF, and OFF
8-4 Front End RF Amp Selection FLAT
8-9 Carrier Offset All ranges set to all zeros
To enhance SSB transmit audio the DSP may then be engaged. Suggested settings are as follows:
Transmit audio EQ
7-7 SSb-t 150 ~ 3100 (Hz)
MIC GAIN control: With a good quality microphone, preferably a headset mic. for excellent VOX operating characteristics, a properly align FT-1000MP series transceiver will require no more than a MIC GAIN setting of 9 o'clock. Most often a setting between 8 and 9 o'clock is all that is required to attain ALC metering peaking toward the upper ALC scale limit.
PROCessor level control: When the speech processor is activated, a PROCessor level setting of no more than 10 ~ 11 o'clock will achieve excellent results without over compressing transmit audio into distortion. (Compression level peaking 3 bars on the COMP metering scale. -- assuming that the transceiver is in good alignment)
*SNR = Signal to
Noise Ratio. The lower the SNR, the better the weak signal
reception, assuming low noise conditions etc.
**I commonly find menu 5-0 set to 8.2 - 455 in many Mark-V and Mark-V Field transceivers. This "mal-setting" defeats the internal 2.4 KHz crystal filter when the filter selection BANDWIDTH is set to the NOR position. The 2.4 KHz filter is available when the BANDWIDTH NAR-1 is selected however. Such a menu "mal-setting" makes it appear as if the transceiver has a narrow option filter installed at position NAR-1, which is normally reserved for the 2.0 KHz option filters (when in SSB mode.) And more importantly, performance suffers in that the receiver's IF circuitry is exposed to adjacent frequency interference. Such a menu setting is useless for serious SSB/CW work, and should be avoided - unless perhaps you have an after market narrow roofing filter installed (i.e. Inrad Roofing filter) and desire listening through the 4.5 KHz nominal bandwidth of the after-market "roofer."
FT-1000MP Mark-V, Linear Power Supply Replacements for the dual voltage FP-29:
For the 30-VDC requirement, most 28VDC linear supplies when turned up to 30 volts work well. One supplier for such a supply is Astron, specifically their models: LS-18A , and the heavier duty LS-25A. Details available on Astron's website here:
For the 13.5 VDC requirement, use a regulated supply good for at least 3.5 amps. continuous duty.
The Mark-V DC power cord is then wired as follows to the substitute power supplies. WARNING, observe correct polarity and correct connections to prevent damage to equipment!
Connect to the 13.5 VDC power supply:
Small ORANGE wire to (+) Positive
Small GREEN to (-) Negative
Connect to the 28~30 VDC power supply:
Large RED wire to (+) Positive
Large BLACK wire to (-) Negative
Small white wire: no connection
Small gray wire: no connection
Note; The Mark-V will be fully functional on receive when powered from the 13.5 VDC supply.
Once the transceiver is up and receiving, activate the 28~30 VDC supply to power the TX 200 watt final amplifier.
FT-1000MP, Mark-V & Field notes
* Sub-RCVR (RX-2 Unit) S-Meter Calibration Drift is a typical
characteristic of the less than precision "spotting grade" 2nd
receiver. It is generally preferable for the Sub-RCVR to
drift into calibration as the transceiver warms up rather than
drift out of cal. All transceivers serviced in my shop are
calibrated after a minimum of one full hour warm up at room
temperature or approximately 74° F.
From that point onward, when the transceiver is powered on
from a cold start, the Sub-RCVR's S-meter will have the
characteristic of reading several S-units more than the main
S-meter prior to warm up. After warm-up (typically one hour at 74°
F. room temperature) the Sub RCVR's S-meter will have
drifted into calibration and track the main S-meter within one
* Transceiver Frequency Readout Calibration; all transceiver's
serviced receive REF Unit calibration after a one hour warm-up
period. This is particularly important i.e. for the base model
FT-1000MP that have only the stock REF Unit oscillator. Better
for such units to drift into cal. rather than to always be
moving away from calibration during warm up.
* VFO A/B resetting to 7.000.00 at switch-on is a common
symptom many MP series transceivers tend to develop over time as
the units age. Sometimes this annoying but mostly harmless
characteristic will remain over several power-on cycles and then
straighten up on its own.
Unless the problem is related to a hard fault with the CNTL Unit board or ATU control board, cycling the back-up battery ON/OFF switch several times may correct it. Cycling the switch burnishes-in its silvered contacts restoring any lost continuity. Stubborn cases may require switch cleaning with contact cleaner, then de-Ox treatment. If the problem remains uncorrectable then electronics component level repair is in order.
Back to Main Page
The content on this site is protected by copyright. All rights reserved.