Home |
Search |
Today's Posts |
#11
|
|||
|
|||
Cecil, W5DXP wrote:
"The requirement is that the coil be self-resonant at the operating frequency." That`s what I remembered. It`s as if a parallel resonant LC circuit is substituted for a quarter-wave short-circuited stub inverting the phase. My problem is finding the page in Kraus` 3rd edition. Anyone have the number? Best regards, Richard Harrison, KB5WZI |
#12
|
|||
|
|||
Richard Harrison wrote:
My problem is finding the page in Kraus` 3rd edition. Anyone have the number? Page 824 -- 73, Cecil, W5DXP |
#13
|
|||
|
|||
Cecil, W5DXP wrote:
"Page 824" Yes. Thank you very much. I had lost track and seemed not to be able to find the item again. The illustration is Figure 23-21 (b). Four in-phase 1/2-wave elements with phase-reversing coils. Kraus says: "Here the elements present a high impedance to the coil which may be resonated without an external capacitance due to its distributed capacitance. A phase reversal is about 180-degrees. Best regards, Richard Harrison, KB5WZI |
#14
|
|||
|
|||
Richard Harrison wrote:
Cecil, W5DXP wrote: "Page 824" Yes. Thank you very much. I had lost track and seemed not to be able to find the item again. Those little sticky tabs solve the problem. The illustration is Figure 23-21 (b). Four in-phase 1/2-wave elements with phase-reversing coils. Kraus says: "Here the elements present a high impedance to the coil which may be resonated without an external capacitance due to its distributed capacitance. A phase reversal is about 180-degrees. Thanks Richard, there are apparently still old wives who believe that a coil cannot reverse the phase of the current even though a shorted stub can. I'm going to post the current magnitudes and phases for a number of 3/2WL configurations along with the gains. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#15
|
|||
|
|||
Mike Coslo wrote:
Well Richard, have you not heard of the famous aperture mask? Reduces the aperture of the telescope, and there are people that swear by them! And, they don't work either. Mine works well to reduce the light from the moon to a comfortable viewing level for my 18" diameter reflecting mirror. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#16
|
|||
|
|||
On Fri, 30 Jan 2004 08:24:34 -0600, Cecil Moore
wrote: Mike Coslo wrote: Well Richard, have you not heard of the famous aperture mask? Reduces the aperture of the telescope, and there are people that swear by them! And, they don't work either. Mine works well to reduce the light from the moon to a comfortable viewing level for my 18" diameter reflecting mirror. So do moonglasses. |
#17
|
|||
|
|||
Richard Clark wrote:
wrote: Mine works well to reduce the light from the moon to a comfortable viewing level for my 18" diameter reflecting mirror. So do moonglasses. If you don't mind looking like a dorky nerd. :-) -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |