FT1000D capacitor / resistor / transformer changes for all mods done at W3DUQ: I-F BOARD: C2123 remove 470pf AUDIO BOARD: C3101 remove .022mfd C3080 remove .0022mfd C3123 change TO 47mfd C3133 change TO 47mfd C3127 change TO 47mfd C3135 change TO 4.7mfd C3082 change TO 100mfd C3135 change TO 10mfd C3234 change TO 10mfd R3052 parallel a 2.2k R3053 parallel a 2.2k R3055 parallel a 1k R3056 parallel a 1k VOX BOARD: C8311 change TO .22mfd C8318 change to 220pf C8319 replace with a jumper SECOND RECEIVER (SUB): C6074, C6402, C6084, C6085, C6086 - REMOVE C6090 change to 10mfd Add .047mfd across J6008 pins 1-2 SHF AMPLIFIER: C9613 remove 68pf C9614 remove 68pf I-F FILTER CHANGES: Change out the original 2.4khz filters with Inrad 2.8(actually 3.1) filters #715c and #716. Remove the 2.0khz filters and replace with the 2.4khz removed in the above step. Remove the 6khz stock small square filter and replace with Collins 10khz #526-8735-010.(be sure to follow the added inductors/resistors per Collins instructions). Note: This will give you 10khz receive AND transmit on AM WIDE plus 2.8khz receive in AM NARROW position. You can also use the modified second (sub) receiver for 6khz AM receive, thus giving you three AM receive bandwidth selections. The AM TRANSMIT remains in the collins 10khz filter mode, thus giving you essentially a "brick wall" audio limitation of around 5khz. JACK MODS: Rewire ALC phono jack on rear apron to P3003 pin 2,(100khz last i-f for use with a monitor scope) Rewire PHONE PATCH phono jack on rear apron through a 3.3k resistor to J3007 pin 3. Bypass the phono input end with a .001mfd. This becomes the hi-fi external audio chain input and the vox and mike gain controls will work this way. On the RX antenna phono jack on the rear apron, solder a jumper from the center pin to L1003 top, located near the rear left edge of the board. This allows the use of an additional external receiver while the 1000d is in receive mode. Turn S1001 to the "on" position to activate the TX out phono jack to ground the linear t-r relay coil.
To increase the overall i-f bandwidth on the ft1000d from 6khz to 10khz it is necessary to adjust at least three of the i-f transformers. Connect a signal generator (another ricebox will do fine for this) to the antenna input of the ft1000d. Set both the ft1000d and signal generator to 3.870mhz as a starting point. You might want to LOCK the vfo on the 1000d for these setup procedures. Turn the AGC OFF, AM WIDE and set the r-f gain for a non overload level with your scope connected to the 100khz i-f output point on the i-f board (rx out J2024 pin 2) or your newly converted i-f out jack.Make a note of the signal level on the S meter with the agc momentarily turned on, then turn it back off. The frequencies below refer to the signal generator, and the peaks are on the scope: Adjust T2001 (8mhz i-f receive) for a peak at 3.870mhz Adjust T2004 (8mhz filter input) for a peak at 3.870mhz Adjust T2007 (8mhz filter output) for a peak at 3.870mhz Adjust T2008 (455khz i-f output) for a peak at 3.870mhz Adjust T2009 (455khz center) for a peak at 3.866mhz Adjust T2010 (455khz mixer) for a peak at 3.874mhz Adjust T2013 (100khz center) for a peak at 3.870mhz) Adjust T2030 (455khz filter input) for a peak at 3.870mhz) Now reset the generator to 3.870mhz and set VR2004 (i-f gain) to the same S meter level that you had at the beginning of this procedure (AGC on) Note: You could also use a sweep generator if available for your signal source.
2004 by William Nagle