I recently looked at a 12ft length of LMR-400 which is part of my 1296 EME system. When I measured the loss, it was around 2.2dB. The calculated loss should be of the order of 0.6dB (plus connector losses, so maybe 0.8dB if the connectors aren't great). The connectors were both wrapped with waterproof tape and also under covers which shielded them from any direct rain. Taking the connectors off, everything looks good. No sign of corrosion, nothing loose, no sign of any arcing, no obvious signs of any moisture penetration). SWR looks pretty good. I can only assume that the cable (or part of it) has become lossy. The cable has never seen more than 300W and the rated capacity for LMR-400 is 580W at 900MHz and 440W at 1500MHz, so it's maybe ~ 485W at 1296? Not sure how to test it. I suppose I could run 300W through it into a dummy load and see if anything gets hot. If it's actually 2dB of loss, that's over 100W with 300W input, so something should get warm! It's bit short for TDR with my 100MHz scope and if it's lossy but 50 ohms, TDR won't show anything anyway.
Anyone else seen something like this?
Bob, KA1GT
Dear friends,
Moon-Net will be moving to a new home in the next few days. This move
should resolve the current problem with Moon-Net messages bouncing from many
subscribers.
You will receive a message from the new host that informs you of its
address.
Your subscription will transfer without you having to do anything.
73,
W9IP
Hi All
A new support forum for WSJT-X (and derivatives) was set up yesterday.
If you have a query about WSJT-X please join this new group. It is
supported by the core development team.
To join, please visit https://groups.io/g/wsjtgroup
73
Charlie DL3WDG
Just returned from Cuba. Took some stuff for the radio club C08. Some of my
electronic parts were confiscated by LA DOUANA. Got it all back on my
return after filling many paper forms. I was able to get a Rotor & a
computer through.
VHF 2 m transceiver not allowed to bring I either.
I should have done more research on what not to bring. I have a new 12 Ele
antenna, LNA for my next trip. Looking for a source of RECEVING transverter
144/28. In Cuba you can only TX 50 watts on VHF. I was surprised my Friend
RG3UX Igor was able to do better than I did.
So if you are planning to go to CUBA do your homework & research on a Cuban
website What not to bring when it comes to electronics stuff
73, Serge VE1KG
