Search found 6 matches

by Ian1951
Thu Jul 04, 2019 11:01 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5684

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Sorry for the delay, I don't use the internet everyday, and there is the inherent delay for my missives to be approved for publication. OMG I've posted enough to be trusted to be allowed to post without approval! Dear SDR33, I don't especially mind if you think I'm someone I'm not, or that you like ...
by Ian1951
Tue Jul 02, 2019 10:26 am
Forum: SDR Antennas
Topic: Antenna for LW
Replies: 14
Views: 6240

Re: Antenna for LW

I am not sure of your electronic skills but this paper by the CIA is interesting and deals with ferrite core ELF antennas. https://www.cia.gov/library/readingroom/docs/CIA-RDP78-03424A000500010007-0.pdf There is an iogroups page devoted to loop antennas, many of which can be used at ELF/VLF/LF https...
by Ian1951
Tue Jul 02, 2019 10:08 am
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5684

LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

I had hoped to follow glovisol example of making a single line post to allow edit and corrections to the main body of the text, but I've not posted enough for that privilege or to be able to send PM. Such is life My brother in law is a hard core SW DXer. He has two tricked out Kenwood R2000 general ...
by Ian1951
Mon Jul 01, 2019 12:32 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9591

Re: A FOOLPROOF ANTENNA SWITCH

I am not trying to start an argument, I am just trying to provide forum members all the information I have. RCA was the first commercial twoway radio manufacturer to experiment with sealed relays with plastic cases that didn't use either gold or palladium plated contacts. The "technical brief" that ...
by Ian1951
Fri Jun 28, 2019 12:03 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9591

Re: A FOOLPROOF ANTENNA SWITCH

W0QE has a page devoted to tests he made on using small relays for RF. https://www.w0qe.com/Technical_Topics/small_signal_relays_at_rf.html The "take away" is most relays and switches are designed to have current flowing through them and dry switching, with no current, often results in premature fai...
by Ian1951
Mon Jun 03, 2019 6:21 pm
Forum: General
Topic: Parting thoughts
Replies: 18
Views: 3498

Re: Parting thoughts

First my qualifications, I've been a licensed amateur radio operator since 1965, back when the FCC handed out WN and KN calls to novices. I graduated high school in 1969, attended a 2 year vocational school and graduated with a FCC first class commercial license. I worked for most of my professional...