Hello Guys, I have a model for loop antenna. I have noticed that if I increase the wire diam. from 0.5mm to say 12mm for a 20m circumfrence wire loop antenna the 1.1MHz gain goes up from -28dBi to -1
Hello Guys Having struggled to model an 3 element endfire Active Vertical array using the same Phasing lines from 0.53MHz to 2.12MHz. I find that I can achieve a very good elevation plot with very lo
Many thanks Chris and Ken for your responce to mail below: I trust that a brief description of the array will answer your questions. The proposed antennas will be receive only 1-2m active Vertical (
Hello Guys, Can any one let me have a ENZEC models for a 2 and 3 element endfire K9AY array and a 2 and 3 element FLAG array ( 1.8MHz 20m spacing will do fine ). I would like to compare these to 2 an
Hello Folks, Is the following, a valid method to either measure amplifier excess noise or make a meaningful comparison? Assume one measures the S/N of a AM Rx to be say 10dB S/N at 30 percent modulat
Many thanks Guy and David for your replies. I certainly have something to think about. Concerning antenna directivity, I am looking to improve the integral amplifier in my K9AY Phased Array( 500kHz t
Hello guys, I have been trying to model a Dual Output K9AY I.e. taking another output from where the termination is normally placed. Then combine the two equal amplitude outputs with a small phased s
Pete, Thank you for looking into the modelling feature. The reason for trying to model the Dual output was to determine the phase relationship verses freq. required to increase the rear null by subtr
Pete, If I leave the 390 ohm load in the model the Dual output model gain is okay. In fact this is what I have done by using 2 matching transformers i.e. the matching transformer is the load!! 73 And
Gary, Many thanks for taking the time to comment on the modelling and clarifying the antennas mode of operation. Terry very kindly sent me a revised model with 10dB attenuators at the source points.
Hello Folks, I am trying to make some meaningful RDF comparisons with Vertical arrays, K9AY arrays and 4 sq. Vertical arrays. I appear to have an anomaly with the 4 sq. i.e. If I look at the max. EL
Terry and Guy, Thanks for the replies. I am using EZNEC+. The gain difference is as Terry commented; I hadn't set the Az angle to 45 degrees for the El plot. It makes sense now. 73 Andrew -- Original
Dear Flam, You wrote on the 6th Nov 2009. I read on the internet that adding "turns" to the Loop could improve signal strength ? The following was posted by me on the K9AY Groups (digest no 78) back
Hello Folks, Is it possible to use NIC to overcome losses in terminated loop antennas? If so, how would one measure the NIC input impedance with say a Signal Generator and an Oscilloscope to check fo
Guy, NIC stands for Negative Impedance Converter. These are active devices that have a negative resistance i.e. the voltage is 180 degrees out of phase with the current. They can be uses to cancel ou
Guy, This link should work now. http://www.ieee.li/pdf/viewgraphs/matching_network_design_non_foster_impedances.pdf 73 Andrew -- Original Message -- From: "Guy Olinger K2AV" <olinger@bellsouth.net> T
Guy Olinger K2AV wrote on the 14th Sept, It seems to me that I have seen stuff like this, but it was never referred to in your terms. It is an old idea, back into vacuum tubes, as mentioned. The devi
Hello Guys, Would I be correct that a Flag antenna with a 1k Ohm termination resistor would have a approx. -126dBm noise in a 1kHz bandwidth, excluding other noise? This equating to an 18dB Noise Fig
Thank you Dan and Gary for your comments. 73 Andrew _______________________________________________ Antennaware mailing list Antennaware@contesting.com http://lists.contesting.com/mailman/listinfo/an