K6JRF's Page
formerly W6FZC
FT1000D Replacement Filter and Capacitor Page
(Updated: Jun 22, 2020)

This Replacement Filter and Cap Page is divided into two categories. Note 1 details the 'standard' replacement in which both 2.4Khz filters are replaced with the new InRad filters and the 2.0Khz filters are replaced by the just removed 2.4Khz Yaesu filters. This gives wb TRANSMIT capability but standard 2.4Khz on RECEIVE.
Note 2 details a wide band (WB) filter approach where the 2.0Khz filters are replaced with 6Khz filters (InRad or Murata) to achieve a wide band functionality on both RECEIVE and TRANSMIT.
The detailed 'how-to-do' instructions and picture for the four capacitor changes are contained in the SCHEMATIC DIAGRAM in the RESULTS section.
Detailed instructions on IF Unit Board access and removal is aslo contained here.

NOTE 1

You must replace two filters mounted on the IF Unit Board. One is soldered in, the other is on a plug-in circuit board. You need to be proficient in un-soldering to do this change and have the right soldering equipment. If you are unsure, then get someone who IS! You could pull up traces or worse, some feed-throughs!

FTAud2a is the MicroSim PSpice schematic (used to simulate the circuit's response) and 'how-to-do',
FTAud2b is the before and after sweep,
FTAud1c is the actual power out vs frequency of my FT-1000D.

I've convinced George (W2VJN) of International Radio Crystals that these filters would be a saleable and now the following filters are now available to FT-1000 owners:
Click here to see InRad filter page for Yaesu radios. Check out filters #715-C and #716-B.
These filters 'open-up' the FT-1000D audio on both transmit and receive! If you wish to order them, simply refer to the FLTR NUM.

International Radio Crystals; phone number is 865-309-5073; Email address is sales@inrad.net
Attached is the semi-detailed instructions for installation. The details show how to do the mod and what is provided in the filter kit.

Detailed Instructions for 'Standard' Filter Modification

This FT-1000D modification replaces the 2.4Khz filters with new 2.8Khz filters. Further it removes the 2.0Khz filters and replaces them with the 2.4Khz filters. The following instructions assume knowledge of the internal structure and board placement in the FT-1000 as boards do have to be removed.

1) Remove the XF2002 (XF-8.2M-262-01) and XF-C (XF-455K-262-01) filters and replace with the newly received IR #716 for XF2002 and IR #715 for XF-C. XF2002 is soldered into the IF UNIT while XF-C is a plug-in board. Desolder XF2002 and replace with InRad #716. The '2.4K' position of the BANDWIDTH panel now becomes the '2.8K' position.

2) Remove XF-A (XF8M-202-01) and XF-D (XF455K-202-01) filters and replace with XF2002 and XF-C removed above. First, mount XF2002 filter onto the supplied pcb board in order to become a 'plug-in' unit into the XF-A slot vacated by the old filter. For XF-D, simply plug-in the XF-C unit removed in the above step. The old '2.0K' position of the BANDWIDTH panel now becomes the '2.4K' position.

3) Mark (re-stencil, etc.) the '2.0K' button as '2.4K' and the '2.4K' button as '2.8K'.

Definitions:
XF2002 - soldered in filter located on the IF UNIT board
XF-C - plug-in board located on the IF UNIT board
XF-A - plug-in board located on the IF UNIT board
XF-D - plug-in board located on the IF UNIT board

InRad #715 - new crystal filter unit mounted on pwb: 2.8Khz bw at 455Khz
InRad #716 - new crystal filter unit: 2.8Khz bw at 8.2Mhz

NOTE: Step 2 is optional. You may elect to leave the 2.0Khz filters as is. Of course, then Step 3 would be modified accordingly.

NOTE 2

Discussion of Wide Band Receive: We've made progress in obtaining great audio from the FT1000D on transmit! However, getting Wide Band (WB) audio in Receive is still a relatively difficult problem. I do, however, have a solution for same but it probably will not appeal to every FT1000D owner.

This week I obtained two Murata filters from the local distributor: CFS455F and CFS455H. Data on these filters is no longer available since the product line has been discontinued (3/1/02).

In order to get WB audio, it is necessary to have a receive bw of at least 6Khz in both 1st and 2nd IF filters! So for me personally, I will convert the '2.0K' position to 'WB' by using the appropriate filters. The present '2.0K' and '2.4K' filters will be retired.

The filters will be located in the '2.0K' position: The 1st IF (8.2Mhz) will be InRad filter #710 (6Khz bw w/ 1.5 shape factor) and the above Murata CFS455F in the 2nd IF. These work on receive only. The transmit audio is still generated via the filters in the '2.4K' position. On receive, the FT1000D has an almost AM quality on SSB; the noise sounds more like a 'hiss' than 'pops' as it does now. Of course, the bw is very broad compared to what it is now, so in a crowded band nearby strong signals are heard. (Actually as it turns out, the bandwidth at the 60dB point with the InRad #715 and #716 filter is no wider than that with the stock Yaesu filters because of the improved shape factors of the InRad filters: jrf)

This solution may not be suitable for many FT1000D owners because this usage is only needed when listening to other similar WB audio stations and/or when taping these stations for playback. I do like to tape (have Sony MiniDisk MZ-R55) and play back the recordings. With the present filters (Yaesu 2.6K in 1st IF and Murata 2.8K in 2nd IF), they give very restricted frequency recordings due to the filter's bw (or lack of it!).

Many owners may still want to have a 'stock' receiver position as was outlined in the original plan document above. By moving the present Yaesu '2.4K' filters into the '2.0K' position, this will be the case. The description below describes the installation of these new 'WB' filters into the FT1000D. But for me, I plan on purchasing InRad #710 (cost $110) to use in the '2.0K' position along with the Murata CFS455F. George at InRad supplies this filter on a compatible pwb board that plugs into the vacated filter slot. Similarly, the 455 filter mounted to another pwb, plugs into the other vacated slot. For users that do not have the Murata 2nd IF 455K filter, InRad makes an equivalent filter, #707 for $120. It's a Collins mechanical filter (CMF) with 6 Khz bandwidth, which will work perfectly! (The CMF provides very smooth, clean audio on both receive and transmit. Much flatter response than the Murata filters. See the results of this in ITEM 7 on main menu: jrf.)



Detailed Instructions for WideBand Filter Modification

This FT-1000D modification replaces the 2.4Khz filters with new 2.8Khz filters. Further it removes the 2.0Khz filters and replaces them with the 'WB' filters. The following instructions assume knowledge of the internal structure and board placement in the FT-1000 as boards do have to be removed.

1) Remove the XF2002 (XF-8.2M-262-01) and XF-C (XF-455K-262-01) filters and re- place with the newly received IR #716 for XF2002 and IR #715 for XF-C. XF2002 is soldered into the IF UNIT while XF-C is a plug-in board. Desolder XF2002 and re- place with InRad #716. The '2.4K' position of the BANDWIDTH panel now becomes the '2.8K' position. Save the vacated filters in a safe place.

2) Remove XF-A (XF8M-202-01) and XF-D (XF455K-202-01) filters and replace with the InRad #710 and #707 respectively. Both filters simply plug into the vacated slots. The old '2.0K' position of the BANDWIDTH panel now becomes the 'WB' position. SSB audio bandwidth is 6Khz! Save the vacated filters in a safe place.

2a) ALTERNATE for use with a Murata 455K Filter: If you have the Murata crystal filter CFS455F (or InRad CMF 707C), mount this to an InRad pwb and plug into the XF-D slot in place of the old XF-D filter. The old '2.0K' position of the BANDWIDTH panel now becomes the 'WB' position. SSB audio bandwidth is 6Khz!

3) Mark (re-stencil, etc.) the '2.0K' button as 'WB' and the '2.4K' button as '2.8K'.

Definitions:

XF2002 - soldered in filter located on the IF UNIT board
XF-C - plug-in board located on the IF UNIT board
XF-A - plug-in board located on the IF UNIT board
XF-D - plug-in board located on the IF UNIT board
InRad #715 - crystal filter unit mounted on pwb: 2.8Khz bw at 455Khz
InRad #716 - crystal filter unit: 2.8Khz bw at 8.2Mhz

InRad #707 - crystal filter unit mounted on pwb: 5.8Khz bw at 455Khz
InRad #710 - crystal filter unit mounted on pwb: 6.0Khz bw at 8.2Mhz

Murata CFS455F - 15 el filter mounted to InRad pwb: 6.0Khz at 455Khz

NOTE: Steps 2 and 2a are optional. You may elect to leave the 2.0Khz filters as is. Of course, then Step 3 would be modified accordingly.

IF Unit Board Removal and Filter Installation:
This summarizes the method that I used to remove the Yaesu filter (XF2002 marked XF-8.2M-262-01) and install the InRad #716 filter. If you have a better method then by all means, use it! Also if you are not proficient at de-soldering parts from a multiple layer pwb, this is not for you!

1) Remove the top and bottom covers. With the radio upside down and front panel closest to you. The IF UNIT board (IFb) is easily located since it it has all of the filters mounted on it.
2) Remove six (6) screws holding the IFb down. Using a small flat blade screwdriver, pry up the white plastic hold-down clip from the LOCAL UNIT (LU) case. Do NOT cut the cable tie holding the large bundle of wires near the left end of the IFb. Clean off the old tape remains from the LU case and the back side of the hold down clip. Gently move the cable bundle to gain access to the screw located in the corner of the board and the coax connector.
3) Unplug the coax cable connectors (gray wires) with the RED, BROWN and YELLOW bands on them. These cables are located along the edge of the IF UNIT board closest to the front of the radio. These must be unplugged in order to flip the board upside down. No other connectors or cable ties need be cut.
4) Move the large cable assembly and gently work the board out and flip over exposing the back side of the board. Use a large iron tip in order to fully heat the connections of filter XF2002. Remove the XF2002 filter by heating the six (6) connections (2 case ground, 2 signal ground and 2 signal IN/OUT). The GROUND side connections are VERY difficult to unsolder and clean out. Use patience here!
5) Mount the new InRad filter #716 into the vacated holes and solder it to the IFb. Clean up the area with suitable solder degreaser.
6) Re-seat IFb and besure to plug in the three (3) coax connectors. Next replace the six (6) hold down screws. Next re-dress the cable bundle carefully so it fits below the bottom cover. Apply a piece of double-sided foam tape such as Radio Shack 64-2343 to the back of the white hold down clip. Stretch it back tightly, remove the back and firmly attach to the LU metal case.

Filter and Cap Results

Here's the results of the new replacement filters. The results with the InRad #716 and Murata CFS455F filters was nothing short of spectacular! I experienced an increased bw on receive and also on transmit!
The audio reports indicated a 'smoother' sound that occurs with more bandwidth. The receive was wider on both the lower side (down to 80 hz) and upper side (good response at 2950HZ!) as shown in the attached POWER OUT vs FREQ chart (FTAud1c.gif).
The filter board was received (thanks to George at InRad) in today's mail (6/5/1999) and the filter mounted to the board with no difficulty. The filter plugged in to the XF-C slot in the IF UNIT board. Simply remove the present unit (XF-455K-262-01) and replace with the InRad board. Ten minute job from start to finish. No tweaking was required.

The signal generator was found to be 150hz off at 3Khz and around 20hz at 100 hz so the frequency data in the X axis is not quite correct. You need to mentally add the correction factors. After receiving SpectraPlus, the signal generator was recalibrated to remove this error. The SP plots are, of course, correct.

Power Out vs Frequency; Before and After Location of the '4' Audio Caps PSpice Simulation Schematic for FT1000D PSpice results Before and After Cap Changes


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