Hans Remeeus PA0Q

ex PA1HR

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Filtering of the Yaesu FT-1000D

Filtering, modifications and improvements of the Yaesu FT-1000D

The Yaesu FT-1000D which I use and was manufactured in May 1995

IMHO the FT-1000D still is one of the best transceivers which has been made for the amateur radio market.

For my purposes I prefer analog rigs like the FT-1000D,

in combination with Inrad IF-filters, the Inrad Roofing Filter and the Timewave DSP599zx.

Inrad filter setup in the Yaesu FT-1000D

455 kHz IF-filters

Inrad #715-C 2800 Hz instead of the Murata CFJ455K13 2400 Hz

Inrad #702-C 2100 Hz instead of the Yaesu XF-D 2000 Hz

Inrad #721-C 500 Hz instead of the Yaesu XF-E 500 Hz

Inrad #704-C 250 Hz instead of the Yaesu XF-F 250 Hz

8.2 MHz IF-filters

Inrad #716-B 2800 Hz instead of the Yaesu XF-8.2M-262-01

Inrad #709-B 2100 Hz instead of the Yaesu XF-8.2M-202-01

Inrad #701-B 400 Hz instead of the Yaesu XF-8.2M-501-03

Inrad #708-B 250 Hz instead of the Yaesu XF-8.2M-251-01

International Radio filters are superior in performance to original radio manufacturer filters.

Example of the Performance Curve of the #709 2100 Hz filter:

Inrad Roofing Filter

This Roofing Filter can substantially reduce the third order Intermodulation

from multiple strong signals in the 2 to 20 kHz region either side of the tuned frequency.

Installation is simple and requires soldering the +12V and ground wires.

One coax is moved and a coax jumper is added.

W8JI Keyclick and Noise Blanker Modification

On the very interesting site of Tom W8JI you will read more about these mods:

W8JI Keyclicks FT-1000D

For the serious CW-operator this mod is a must!

The FT-1000(D) runs an essentially unshaped CW waveform into the filters.

This harsh signal generates unnecessary keyclicks.

The clicks are strongest from almost 1 kHz below to 2kHz above the transmit frequency.

Thanks to Tom W8JI for his great help with this important mods!

FT-1000D Sub-Rx filter setup

Instead of the Murata Ceramic CFJ455K15 2400 Hz filter: the Inrad #715-C 2800 Hz filter wired-in for the 455 kHz IF.

Instead of the Yaesu XF-455MC 600 Hz filter: the Inrad #1303.2 500 Hz filter for the 455.8 kHz IF.

This is a substantial improvement of the FT-1000D's Sub-RX!