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:
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!