>From W8JI.com, maybe 5000 has similar adjustments. If the IF Transmit Gain was too high the 1000 would exhibit huge power spikes on key down or pressing the mike PTT button.
Transmit Gain Menus The FT-1000 MK V has hidden transmit gain menus. They are accessed by pushing and holding FAST and LOCK while turning the POWER switch on. Both of my MK V's and every MK V serviced here has had the TX IF gain set too high. This causes first character clicks on CW and spits and splatter on SSB. Here is how to correct the IF gain to prevent ALC clipping on leading edges of CW and voice: Press and hold FAST and LOCK before and during initial POWER on. Press FAST and ENT at the same time. You are now in the MENU's and the display should say "0-1 GrPI-cH". Turn the VRF/MEM CH counter-clockwise to 9-2. The display should say "t iF - GA in" This is the transmit IF gain menu. Turn the SUB VFO knob clockwise one position to " t iF - 018". This is the 1.8MHz transmit IF gain. Press the ALC/COMP meter selector until the bar graph says "ALC". Set RF PWR knob to full power. With the radio on CW and a 50 ohm dummy load connected, close the key and adjust the MAIN VFO-A knob until the ALC display is about 75-85% of full scale on the illuminated bar marked "ALC". Press the next band button (3.5), make sure the radio is still on CW, and turn the SUB VFO-B knob clockwise one band to "t iF - 035". Again adjust MAIN VFO-A until ALC is at 75-85% of full scale. Repeat this process through all bands. Most radios I have tested require a setting of 2 to 4 on TX IF gain, with 3 being the most common setting. This change will reduce SSB bandwidth and distortion. It will also reduce keyclicks and annoying thumps on the leading edge of each Morse character. Hope this helps; Bill W2PKY On Fri, Apr 12, 2019 at 12:38 PM Frank Kirschner <frank.kirsch...@gmail.com> wrote: > Some rigs, even high-end rigs including the FTdx5000, exhibit a spike on > initial transmit. I noticed it mostly with the amp. The power would surge > briefly, and then return to the dial value. > > I suspect the combination of the surge and a bit of RFI is causing the > problem. I suggest an opto-isolator on both ends of your CAT cable. They > are available for RS-232 and USB. That, plus some ferrites along the run > should help with the problem. Also, if you're using a desktop, try running > several ground straps to the case of the computer. Consumer-grade computers > aren't very resistant to RFI, and there is no bonding between the pieces of > sheet metal. > > 73, > Frank > KF6E > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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