Yaesu FT-847 VOX Box
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It's a great little radio, but no VOX! So we're making one. This is a separate box, powered from the radio Microphone jack. It has an 8-pin connector on the back for a Yaesu microphone. It has a mini phone jack on the front for a Heil microphone. Controls are provided for Gain, Delay, and Anti Vox. Yes, it will work with other rigs that don't have VOX. Click Here to order.
- Yaesu FT-920 Filter Switch Board
The FT-920 Switch Board allows the use of one filter or two in cascade. The switching is done by a mini toggle switch mounted on an L bracket under a screw in the bottom cover. Two of these boards may be mounted in the FT-920, providing filter selection from one switch for both CW and SSB. The boards are supplied pre-wired so the customer need do only a minimum of soldering. Click here to order!
One early customer of this mod wrote the following (unsolicited!) review:
"...the resulting performance improvement in the radio is dramatic... The two filters in cascade create an improvement in selectivity that really stuns the ear. It's so obvious to hear the skirt noise drop away and the voice in the middle of the passband jump in clarity. Flick the switch to cut out the cascade, and the radio returns to the full-sounding audio for casual rag-chewing... You have transformed the FT-920 into a super premium receiver..."
Click here to see performance curves of the Switchboard with 2.1 kHz and 1.8 kHz SSB filters.
- Yaesu FT-1000MP & Mark V Front End Mod
We now have a mod for the FT-1000MP: a small 70MHz I.F. amplifier. It boosts the front-end gain a few dB. The IF gain setting in menu item 9-1 is then reduced to compensate, and the radio's background hiss is greatly reduced. The byproduct is increased sensitivity of 2-4 DB in noise floor reduction. This is a plug-in, no-solder mod which can be easily removed. The Front End mod will also work in the MARK V, except it requires soldering two connections. This mod applies to the new Field model also.
Full installation instructions are available here:
- Yaesu FT-1000MP/MarkV/Field IF Mod Installation Manual
See our Secure Order Form to order.
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Yaesu FT-1000MP AGC Improvement Mod
- Some operators on major DX-peditions have complained about poor readability
in large pile ups. From a joint effort between INRAD and some of these
operators, we are now offering the AGC mod which improves readability
somewhat for both CW and SSB. Details of the history is included in the
mod instruction sheets. This new mod increases the decay time, which in the
FT-1000MP is so fast that weaker signals can come up to full output between
dots and dashes (or speech peaks), causing poor readability in pile ups.
It also uses a damping resistor to eliminate a slight over shoot. Please be aware that under "normal" or "average"
operating conditions, this mod will make very little discernable
difference. The AGC mod is not applicable to the Mark V. See our Secure Order Form to order.
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Yaesu FT-1000MP & Mark V Roofing Filter
International
Radio Corp is building more FT-1000MP (and MV and Field) roofing filter mods.
These roofing filters can substantially reduce the third order Intermodulation
from multiple strong signals in the 2 to 20 kHz region either side of the tuned
frequency. Please see our PDF document titled "A
few words about Roofing Filters" for
more details. This is a plug-in, no-solder mod that can be easily removed.
The roofing filter will also work in the MARK V, except it requires soldering
two connections. This mod applies to the new Field model also. NOTE: This unit
cannot be installed along with our 70 MHz
IF Mod. Only one or the other can be used.
Full installation instructions are available here:
- Yaesu FT-1000MP/MarkV/Field Roofing Filter Installation Manual
For background information about roofing filters, plus performance data and customer comments about the new INRAD Roofing Filter for the Yaesu FT-1000MP series, as well as our plans for Roofing Filters for Ten-Tec and ICOM radios, click below:
- roofing-filters.pdf
- Click here to see the February QST review.
Reproduced with the kind permission of the publisher, the American Radio Relay League.
- Click here to see the January RadCom review.
Reproduced with the kind permission of the Radio Society of Great Britain; copyright RadCom.
See our Secure Order Form to order.
- Yaesu FT-1000 & FT-1000D Roofing Filter
International Radio Corp now can supply a roofing filter mod for the FT-1000 and FT-1000D. These roofing filters can substantially reduce the third order Intermodulation from multiple strong signals in the 2 to 20 kHz region either side of the tuned frequency. Please see our PDF document titled "A few words about Roofing Filters" for more details.
Installation is simple and requires soldering the +12V and ground wires. One coax is moved and a coax jumper is added. Full installation instructions are available here:
- Yaesu FT-1000/FT-1000D Roofing Filter Installation Manual
See our Secure Order Form to order.
- Yaesu FT-1000MP / Mark V / Mark V Field Keying Improvement
- The MP keying rise time is 2.4 mS and fall time is 1.0 mS. The fall time is
responsible for the somewhat wide signal, which the MP generates on CW.
There are two points in the radio which can be used to improve the keying by
slowing the voltage change over from receive to transmit and back.
Three parts are added to the radio. Two go on the IF board and one goes on
the RF board. They are small leaded parts which solder on the bottom side
of the boards. Board drawings are supplied which show the part locations.
The IF board is fairly easy to get at. The RF board is buried under the
final amplifier and is somewhat difficult to get at. Estimated time to
install is 1 hour.
For actual spectral data on the keying improvement made by this mod, click
below:
- about-key-clicks.pdf
See our Secure Order Form to order.
- Yaesu FT-101 WARC Band Modification
Kit
- FT-101-Mark through FT-101F. (Not for FT-101ZD)
- FT-101 - Price reduced to just $45.00!
- Fox Tango Tone Pulser Kit
- "One of the best gadgets for Fox Tango ever produced," writes
a long time F/T participant. A small (1.5" square) PC board,
easily mounted in the base of a desk mike or little plastic box, produces
pulses of audio 2 kHz tone at a rate to simulate load factor of audio speech
(30%). Thus when injected into the mike or patch input jack, a constant
signal is produced which, in the SSB mode, can be used to tune the final
amplifier(s) at a maximum power without concern for damage to final amplifier tubes regardless of how long it takes. Operates on its own 9V battery (not included) or power from rig. THIS KIT IS NO LONGER AVAILABLE -- BUT A NEW AND MUCH IMPROVED MODEL IS IN DEVELOPMENT AT THIS TIME. CHECK WITH US LATER THIS AUTUMN!.
International Radio's Key Pulser is designed to key a transmitter at a predetermined duty cycle to allow tuning at a safe average power level. The heat generated in a radio (or radio plus amplifier) is determined by the average power being dissipated. This can be very high if tuning is done with the key down full time. By pulsing the key line the average power can be reduced by the duty cycle of the keyed waveform.
