Harry,
Make certain you have the bottom cover in place when running CAL PLL -
yes, it does make a difference!
If you did it with the bottom cover off, no harm, just do it again.
73,
Don W3FPR
On 10/26/2013 10:12 PM, Harry Stone wrote:
Strange indeed, and here is why, when I was messing with it just now
measuring again, I laid my arm across the case and then I got voltage.
Somewhere I had something shorting against the case.
I'm back on track now, VCO voltage is in spec for every band. CAL PLL is
running now. When it's done I will double check the bottom of the RF board
to make sure I don't have something sticking up too high.
Thanks again!
harry
On Saturday, October 26, 2013, Don Wilhelm wrote:
Harry,
That is quite strange. I would examine your work carefully, particularly
looking for lifted solder pads and/or solder bridges.
80 meters should have only C72 in the circuit. You should trace the VFO
range select path with an ohmmeter by following the path in the schematic
(checking for continuity) from K15 pin 3 through relays K15, K14, and K13
to C72. Relays K15 and K14 should follow the path shown by the closed
contacts on the schematic while relay K13 should be "set" which means
continuity between pins 3 and 4.
73,
Don W3FPR
On 10/26/2013 9:09 PM, Harry Stone wrote:
Well I spoke too soon. I replaced that capacitor and now I have 0 volts
on
every band. Any thoughts?
thanx,
harry
On Saturday, October 26, 2013, Harry Stone wrote:
Don,
I know this isn't exactly your first rodeo, but that's still pretty
impressive. I have the wrong component installed at C73, I have a 4
<point> 7 pF instead of a 47 pF.
Bravo!
thanx,
harry
On Saturday, October 26, 2013, Don Wilhelm wrote:
Harry,
The thing in the VFO Range Select area that is common between 40, 30 and
15 meters is C73,
Check its value - it should be 47 pF (marked 470).
A low voltage at R30 indicates that there is not sufficient capacity in
the tuned circuit and the PLL/VCO is trying to increase the value of the
total capacity. That means if C73 is the correct value, check its
soldering and the soldering of relay K13 pin 8.
CAL PLL depends on having the 40 meter frequency range correct, so you
will not be able to do that procedure until you have the R30 voltage in
range on 40 meters (info 232 means the frequency read by the MCU is not
correct (yes there are other possible causes of info 232). The
alignment
steps are sequential, so if one does not give correct results, you
cannot
skip to the next one without encountering problems.
73,
Don W3FPR
On 10/26/2013 6:13 PM, Harry Stone wrote:
My VCO control voltage is zero on 40,30, and 15 meters. All other
bands
are within the normal range, all tests prior to these measurements
passed.
When I try to run CAL PLL, I get info 232 even though I am on 40
meters.
What should I check first?
--
Have old memories and young hopes.
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