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I think it is feasible to chose component values that would produce a 90 degree phase shift at a given frequency, especially if this is somewhere close to resonance, and if you are only interested in

Hi Martin and All Illustration of SCPQ-10.5 Datsheet. I thought about the "or some other element" that Martin mentioned. Most simple one is capacitance between the coil. I did a simple simulation in

I will be interested to see how well that performs outside its specified frequency range. I suspect it would actually work OK down to at least 2MHz, but Mini-Circuits published specifications tend to

Hi I ordered the minicircuits JSPQ-65W+ for a new project. 73, Rolf RX: SIR-2115, G69/31DDC, PERSEUS, SIGNALHOUND, AFEDRI, GRX-LAN…… ANT: T2FD, G5RV, ALA 1530/100, GA3005, X-ONE,

Yes Martin. With a 90 deg. Phaseshift the directional pattern of the E-plane of the dipoles then rotates with the period of the Signal by 360 degrees. Thus the average horizontal rms Rotation ist

Hi Fred, Rick did also say to include a 1/4 wave transmission line in one leg, in order to introduce a 90 degree phase shift at that specific frequency. This method is typically used in coaxial

are you sure, Rick? As far as i know: if you combine two orthogonal dipoles ( X-dipole) via an 180° coupler you only achieve a +45° oder a -45° Skew of the E-Plane directional pattern of the

Typical, I found the book title just after I'd pressed send. It's a bit pricey new, so I'd try and borrow a copy, via your local library (remember those). "Lumped Element Quadrature Hybrids" by David

You may also wish to look out for an article entitled "How to design wide band RF quadrature networks" Page 5, QEX, November 1982, published by The American Radio Relay League. Another source is "The

Hi Hisami, All 90 degree hybrids tend to be relatively narrowband devices. However, you can extend this by adding more phase shift sections, with their corner frequencies offset by suitable amounts.

Hi Martin, Thanks for the schematic. I see that in principle, it is narrow bandwidth. With the help of NanoVNA, I think I can adjust it. I will give it a try. By the way, it seems that Mini-Circuits

Hi Fred, Hi Martin, Now I can understand the difference between "90 degree hybrid" and "0 / 180 combiner" Thank you very highly for your help. 73, Hisami 7L4IOU

Hi Matthias, Thank you very much for your valuable information. The schematics and pictures are helpful. Especially, I could understand the mechanical structure very well. I will try to

Digikey much better price than Mouser $9,694.21? :) No, the link to a homebrew coupler is for versions with either a 0 or 180 degree shift John??? KK6IL

I have posted a couple of pictures. /g/loopantennas/photo/267767/3908145 /g/loopantennas/photo/267767/3908144 Note that the part numbers in the simplified circuit

1. If you work at a narrow band of frequencies, you can simply use a 0 or 180 degree hybrid combiner to feed the two loops, except you make one feedline a quarter wave longer than the other.

For general info, this preamp was designed by Jack Smith K8ZOA (now SK); I built the first 25 of them for him. The preamp is a nominal +30 dB 50 ohm in/out preamp with a balanced Norton input followed

Hi Fred, Yes agreed, I should have clarified that. Regards, Martin

Martin, with two horizontally polarized turnstile dipoles you get horizontal linear Polarisation and an omnidirectuonal pattern. You get circular polarisation only in the vertical direction,

Hi Martin, Please send me what you have in the way of circuits? Everett Sent from the all new AOL app for iOS