Author: Charlie Delta via RFI <rfi@contesting.com>
Date: Sat, 8 May 2021 08:08:44 +0000 (UTC)
Hi Can someone who owns a Radar Engineers model 250 or model 251 Ultrasonic RFI receiver kindly tell me the dimensions of the dish? I am particularly interesting in the dish depth and the focal dist
It's kind of early for me and my mind's a little cloudy as I had a late night last night. However, there is a really nice dish available made of lexan. It was made to be a squirrel guard for bird fee
You might check out this dish... https://www.midnightscience.com/ultra-kits.html 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Dir
I found a parabolic metal dish at Lowes being sold as a squirrel deflectors for bird feeders. See link https://www.lowes.com/pd/Black-Squirrel-Baffle/1000931908I have since seen plastic ones that a
I came across this article a couple days ago; http://www.kk4ice.com/wp-content/uploads/2015/01/KK4ICE_Ultrasonic_RFI_Detection.pdf Use's a 18" satellite dish and surplus ultrasonic. Few details in th
RE dish choices: Really nice looking and cheap and light, available at Walmart, Amazon,.. $22 > $25 AUDUBON NACLBAF16 Clear Squirrel Baffle, 16-Inch Has anybody measured the profile, focal length, et
Author: Charlie Delta via RFI <rfi@contesting.com>
Date: Sat, 8 May 2021 23:34:30 +0000 (UTC)
Thanks to all that replied. 1. Midnight sciences have closed down W0xi has retired and no longer sells kits or dishes. 2. I appreciate all the suggestions for a parabolic dish source. However I more
The RE 250. I have one. The dish dia measures 18" and the depth is 4-3/8". The transducer opening is just over 4-3/8". The opening of it's housing is level with the dish when viewed across the dish o
Craig, One aspect of the design that may be overlooked is the beamwidth of the ultrasound transducer itself. Even with a proper F/D ratio, the transducer may not fully illuminate the reflector or ins
Author: Charlie Delta via RFI <rfi@contesting.com>
Date: Thu, 13 May 2021 10:12:59 +0000 (UTC)
Hi Mike I have studied the various datasheets for Ultrasonic receivers. Most have a broad beam width that is something like more than 60 degrees. This includes the widely used Kobitone transducer. I
Charlie considered using a mounted green laser sight. During the winter months when the Sun goes down it makes it very difficult to see where you're pointing. If I remember correctly, green seems to