Re: TR-4C problem on 40 meters FIXED
¿ªÔÆÌåÓýI 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 |
