|
Title: ER Mag HB 833A Post by: flintstone mop on January 19, 2009, 09:33:39 AM In this month's ER is a beautiful HB cathode modulated transmitter using, what looks, like a single 833A. Very nice cabinet and viewing window.
Fred Title: Re: ER Mag HB 833A Post by: Mike/W8BAC on January 19, 2009, 10:14:05 AM Yup, That's Discone Dan, W8NWF in Whitehall Michigan. Dan is a regular on the DX 60 and Multi Elmac nets. The new rig sounds sweet and the 80 meter Discone puts it over the top.
Title: Re: ER Mag HB 833A Post by: W9GT on January 19, 2009, 11:19:23 AM I heard about the article, but haven't received my ER yet. Dan did a beautiful job on this transmitter and it should present some ideas and encouragement to those who might want to build a rig, but are scared off by the high cost or scarcity of mod iron. This cathode modulated rig sounds great and straps on 75M!
Kudos to Dan for a great project and a super signal with his "Cathode Crusher". Maybe we will hear some others on soon with similar rigs. 73, Jack, W9GT Title: Re: ER Mag HB 833A Post by: Mike/W8BAC on January 19, 2009, 12:02:25 PM Don't be disappointed Jack, It isn't an article exactly. Just a nice picture in the photo section.
Title: Re: ER Mag HB 833A Post by: W9GT on January 19, 2009, 01:03:44 PM Well, hopefully Dan will follow that up with an article about the details. ;D
73, Jack, W9GT Title: Re: ER Mag HB 833A Post by: flintstone mop on January 19, 2009, 02:10:11 PM OK what's this about a Discone antenna???
Something new??? 5dB gain. I'll have to Google that. Fred Title: Re: ER Mag HB 833A Post by: Jeff W9GY on January 19, 2009, 06:22:54 PM Here's a photo Dan sent me during the early testing phase of the project
(http://home.comcast.net/~jeffw9gy/dan.jpg) Title: Re: ER Mag HB 833A Post by: Steve - WB3HUZ on January 19, 2009, 07:55:08 PM LOL. No such thing. No single vertical will have any gain other than games using dBi and such. Pure BS.
OK what's this about a Discone antenna??? Something new??? 5dB gain. I'll have to Google that. Fred Title: Re: ER Mag HB 833A Post by: K6JEK on January 20, 2009, 12:23:12 AM I really wanted to get the 80M discone working when I was a member of the Monterey Bay Radio club at the former Fort Ord MARS station but I could never screw up the courage to climb that big pole then try to work on the connections while reaching over the connection plate at the top. Here's a picture of the beast:
http://www.n6ij.org/images/new_0803/80Mdiscone.jpg See what I mean? From what I've read, the magic of the discone is extreme bandwidth, not gain. Title: Re: ER Mag HB 833A Post by: K3ZS on January 20, 2009, 10:00:31 AM The military used them for their UHF aircraft ground stations, they covered the 200-400MHz band. Of course they were much smaller.
Title: Re: ER Mag HB 833A Post by: W4EWH on January 20, 2009, 11:30:13 AM From what I've read, the magic of the discone is extreme bandwidth, not gain. That's exactly right: if you took a log-periodic antenna, and rotated its boom 360 degrees, the path that the end of each element follows through the rotation would form the outline of a discone. Bill W1AC Title: Re: ER Mag HB 833A Post by: W1EUJ on January 20, 2009, 12:14:07 PM If I rotate a yagi on its axis, you form a tower-of-hanoi stack of discs, flopped over.
Title: Re: ER Mag HB 833A Post by: Ed/KB1HYS on January 20, 2009, 07:17:07 PM That is one fine looking rig! I hope they do a write up about it, I bet it will be good reading. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
|