This time, I’ll replace that big orange capacitor with something newer (along with any other components that look like they need replacing). The signal generator doesn’t seem to be putting anything out at the BNC connectors anymore, so that will be another thing I’ll check.
Bidding for the 2017 ARRL Auction opened up yesterday. Didn’t see anything that made me go “I NEED THIS“, but there were still a few items that I thought were interesting enough to put bids on.
Seems like there’s a fair bit of bidding activity going on in the auction already after just a day. The ARRL Mystery Junque boxes are back (only 4 of them this year). One of them is already up to $155. Hope it’s got something good in it.
So far, the items I’ve decided to chase are a copy of Introduction to RF Design, a reproduction 1st edition ARRL handbook, and one of the Vibroplex keys. Nice things to add to the bookshelf and collection, but nothing that I’ll be disappointed over if I don’t win.
I always enjoy watching the activity in the ARRL auction. It’s interesting to see what items end up going for.
US amateur radio operators will soon have access to small slivers of the 630 m and 2200 m bands as secondary users. The 630 meter allocation goes from 472-479 kHz (a little bit below the US AM broadcast band, 530 – 1700 kHz) while the 2200 meter allocation goes from 135.7-137.8 kHz (not a heck of a lot).
Before being allowed to operate, hams will be required to notify the Utilities Technology Council. Notification can be done online, and involves submitting name, contact info, call sign, lat/long of your antenna location(s) and the bands you’re planning on operating on. If you don’t hear anything back within 30 days, you’re supposedly good to go.
Even if you have no immediate plans to operate on the new bands, you might still want to notify the UTC in case you decide to operate there later. If there’s no objection to your notification, and a utility later wants to deploy or modify a PLC system near you, they’ll have to use a frequency range other than one you’ve indicated on your notification.
If an electric utility seeks to deploy a new or modified PLC system on a transmission line that is within one kilometer of a previously coordinated amateur station, the electric utility must employ a frequency in the 9-490 kHz range that has not been included in the amateur station’s notification, as ARRL suggests. If the previously coordinated amateur station no longer operates in the band, the electric utility may deploy a PLC system in that band.
I’ve updated the schematic for the power supply. Made a few corrections and rearranged a few things.
Still haven’t figured out why the outputs are behaving like they’re shorted out. Putting a my DMM across the output terminals gives me about 148Ω, which seemed on the low side to me.
A quick check of the SCR shows that it seems to be ok. I think I’ll check the pass transistors next. Looks like they should be easy enough to remove for a quick test. I should probably check the big filter caps too, although I wouldn’t expect those to be bad.
In the process of troubleshooting, I’ve removed the 6 pin connector and large capacitor (1.4 mF) associated with it. I’m planning on replacing them with Powerpole connectors. Three of them will fit nicely in the space occupied by the 6 pin connector. Just need to figure out how to secure them in place.