Have you tried feeding the LA-1K with your Icom-7610 to see if that would anything, Steven?
Update to this post:
Steven, I tried duplicating the observed behavior of your LA-1K/FTDX101MP using my LA-1K/FT-857D setup, since I don't use my FTDX101D with the LA-1K, as follows:
1.? Set FT-857D to 20W (FM mode)
2.? Set LA-1K (125VAC-ish) to STBY
3.? Key up FT-857D to obtain best possible VSWR at 21.290.00 MHz
4.? In step 3. (above) LA-1K and MFJ-998 both read 20W
5.? Change FT-857D from FM to USB and LA-1K from STBY to OPR
6.? LA-1K observed power output = 400W on peak, during QSO with Teddy VP2ETE
7.? Now, going from step 4. (above) to step 8. (below); skipping steps 5. and 6. (above)
8.? Removed "PTT" connection from back of the LA-1K and changed LA-1K from STBY to OPR
9.? Key up FT-857D and observed indicated power output of the MFJ-998 and the LA-1K
10.? In step 9. (above) the MFJ-998 read approximately 15W
11.? In step 9. (above) and the LA-1K showed a red horizontal deflection of roughly 1mm on the 1400W scale
Hope this helps to give you another point of reference.
73
Ray
KJ5MI
