The big glob under the coil doesn't look good or does the
connections through the ceramic under the coil.? The solder joint
immediately behind the opening in the middle of the ceramic doesn't
look good either or does the solder joint behind it.
73
Stan
KM4HQE
On 12/29/24 16:20, Dieter Horst wrote:
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I had one in a PTO, too! Every now and then, its level was way
down and the R4C's sensitivity with it...? Hitting on the side
of the RX would cure it for a while. But... thou shalt not beat
your Drakes! So I had to open up the PTO and find the culprit. I
didn't take long until I found the bad connection.
Who can spot it? See attached (and have fun!).
73, Dieter DL5RDO
Am 29.12.2024 um 19:01 schrieb Jim
Shorney via groups.io:
Solder connections can develop fractures that are hard to see even with magnification. I had one in a PTO that was only visible from a certain angle, otherwise the connection looked good.
On Sun, 29 Dec 2024 07:35:42 -0800
"Richard Knoppow via groups.io" <1oldlens1@...> wrote:
Congratulations! Its fairly common for their to be cold solder
joints that look fine. Sometimes they show up if you poke around the
circuit with an insulated stick like a chop stick.
On 12/29/2024 2:29 AM, Peter Ravn via groups.io wrote:
I tested contacts, inductance and resistance in all parts used on 40
meters only. While doing so I lifted all leads that might affect the
measurements. This brought 40 meters back to life. Miracles never cease.
Peter OZ8CTH
