RTOP Feb 2024: Masers, FRBs, HI Antenna Analysis, 3D Printed horn, and Hi Observation Results

SARA www.radio-astronomy.org
Chat:
Joseph Sandy: Link for ezRA: github.com/tedcline/ezRA
eduard: ONSTEP project: onstep.groups.io/g/main/wiki/...
eduard: Some details on the 22.2GHz setup (including dimensions of the horn) could be found in the August 2022 SARA journal
Ted Cline - N0RQV: SARA scope-in-a-box …. www.radio-astronomy.org/store...
Ted Cline - N0RQV: So, Alex is machining discs 1/16 = 0.0625 inch thick.
Ted Cline - N0RQV: Ted is scissoring thinner metal from ….. www.lowes.com/pd/Hillman-6-in...
…... sticker says "0.025 inch thick" = 0.635 mm
nathan: www.radio-astronomy.org/node/385
Ted Cline - N0RQV: SARA Listserv …. www.radio-astronomy.org/email...
Don Latham AJ7LL: spdt rf switches are on AliExpress. www.aliexpress.com/item/32568...
Joseph Sandy: Here is the window adapter I started using recently: I have paired it with just regular old coax cables on either side! Link: www.amazon.com/dp/B07DWXQLSW?...
Don Latham AJ7LL: There is also a more expensive version on ebay as: item no. 402594896342. may be a different chip.
Ted Cline - N0RQV: Don, that "spdt rf switches are on AliExpress. www.aliexpress.com/item/32568..." link fails for me. same for the 402594896342.
Astropeiler Stockert: Replying to "Don, that "spdt rf s..."
I found it on eBay looking for hmc435. At at least I believe this is the device. It is 400 MHz only, though.
Don Latham AJ7LL: Just looked up the ebay switch. right. ostensibly made by Analog Devices.
eduard: My experience with helix antennae is that they have signficant sidelobes, so tha may degrade your system temperature if you use one as a feed for a dish
Don Latham AJ7LL: gosh. analog devices hmc435a data sheet shows dc-4GHz.
Don Latham AJ7LL: also gives 0.8 db insertion loss. I ordered some so I'll run them through my setup when they get here. will let you know.
Astropeiler Stockert: Replying to "also gives 0.8 db in..."
I misread it on the Image: It actually shows 4000 MHz rather than 400. Looking Forward to your test