It's not confusing if you check the schematic. D40 is the VCO output on the
PLL unit and TP3 is the VCO input on the RF unit. They give 2 places you can
measure it.
--
Clif Holland, KA5IPF
AVVid
Authorized Kenwood and Icom Service Center
816 W Shady Grove Rd
Irving, TX 75060

www.avvid.com

1-800-214-5779
972-870-0630 (Local)
"Ken Gunton" wrote in message
...
Have you posted this question to the TS830 Yahoo group? They
could probably answer this immediately.

Go to yahoogroups.com and look for this group to join:

TS-520_820_530_830

Regards,
Ken WB6QWF

On Thu, 18 Dec 2003 15:05:38 -0500, Bill Graham
wrote:

The TS-830S service manual's alignment procedure, Step 9 ("VCO adj &
check") contains the PLL coil adjustments for the various bands. The
procedure calls for a frequency counter and DVM.

Here's my confusion/problem: the measurement point for the frequency
counter is shown as:
RF(PLL) - TP3(D40)

I interpret this to mean EITHER:
TP3 on the RF assy, OR
D40 on the PLL assy

But, perhaps I am mistaken ... I see a vast difference in the signal
levels at these two test-points.

The signal at PLL-D40 appears to be correct (i.e., when I align the
tuning coils specified to produce a 4.00 VDC level on the DVM at
PLL-TP1, I measure a 1.058 vrms signal at PLL-D40).

But, the 2nd step in this section then calls for a check of the signal
level at RF-TP3 to be 1V (+3/-2 db).

But, the signal level at RF-TP3 is so weak as to be almost un-readable
(I measure ~5.0 millivolts).

Final info: I measured the signal level on the RF assy at the junction
of L44 and L40, and it is approximately 95% of PLL-D40 total, so I know
that: a) the VCO cable carying the signal is making good connection and
not hi-Z, and b) L44 is NOT open, c) C61 is NOT shorted, and d) L40 is
PROBABLY not hi-Z.

Which all leaves me with a partial (or full) short at RF-TP3 (what
_should_ the inductance value be of the primary of T3 on the RF unit
be?), or am I simply not interpreting the alignment test-points and
procedure correctly?

BTW: the frequency at PLL-D40 is ~1500 Hz too high.

Anybody have any ideas???

Ken Gunton WB6QWF ken att ohiomicrowave dottt commm
Ohio Microwave
Microwave and RF Components to 110 GHz
http://www.ohiomicrowave.com