Re: HYBRID QUADRATURE JH-6-4 or equivalent
I have posted a couple of pictures.
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Note that the part numbers in the simplified circuit diagram are not the same as those marked on the original PCB. I had only used the minimum amount of detail to be able to run a simulation using Qucs Studio.
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It should be useable from approx 2MHz to almost 30MHz.
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The shifts are not exact 90 degrees over the entire frequency range, but they are close enough for the intended purpose.
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Regards,
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Martin
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On Mon, Apr 21, 2025 at 03:29 PM, Everett N4CY wrote:
Please send me what you have in the way of circuits?
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
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.? Commonly used at VHF.
2.? You can also make a narrow band 90 degree hybrid combiner using a single 1:1 transformer and 2 capacitors and 2 inductors.? I designed one of these into the 5071A atomic clock.? Now still in production after 30+ years.
3.? If you need a broadband 90 degree combiner, you need one transformer with a center tap and a second impedance match transformer.? If you want for example a 100:1 bandwidth, then you need something like 16 inductors and 16 capacitors.? I have actually built several of these, which worked.
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On 2025-04-21 08:29, Everett N4CY via groups.io wrote:
Hi Martin,
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Please send me what you have in the way of circuits?
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Everett
On Monday, April 21, 2025, 9:53 AM, Martin - Southwest UK via groups.io <martin_ehrenfried@...> wrote:
It is a 90 degree hybrid, utilising cascaded phase shift networks, to combine two inputs with a 90 degree phase difference.
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This is required to produce omnidirectional, circular polarisation, when two linear antennas mounted at right angles are combined.?
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If you use a standard 0 / 180 combiners, you only end up with a resultant linear polarisation, at 45 degrees to the two sets of elements.
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The JH-6-4 is quite complicated, and uses precision value capacitor and inductors, which is why it is so expensive, it also probably requires a bit of tweaking in order to optimise the response curves.
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I have a much simpler circuit that I reverse engineered from a pair of crossed CSA loops, if you wish to try making your own.
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Regards,
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Martin
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On Mon, Apr 21, 2025 at 02:04 PM, Matthias wrote:
Does anyone know what the JH-6-4 or equivalent is made of or how it works?
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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 by a balanced bipolar output. (I have contacted Joe privately about a schematic.)
73,
Steve AA7U
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
Hi Fred,
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Yes agreed, I should have clarified that.
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Regards,
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Martin
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
Martin,
with two horizontally polarized turnstile dipoles you get horizontal linear Polarisation and an omnidirectuonal pattern.
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You get circular polarisation only in the vertical direction, orthogonal to the linear polarized plane of thevdipoles.
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regards, Fred
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
Hi Martin,
Please send me what you have in the way of circuits?
On Monday, April 21, 2025, 9:53 AM, Martin - Southwest UK via groups.io <martin_ehrenfried@...> wrote: It is a 90 degree hybrid, utilising cascaded phase shift networks, to combine two inputs with a 90 degree phase difference.
?
This is required to produce omnidirectional, circular polarisation, when two linear antennas mounted at right angles are combined.?
?
If you use a standard 0 / 180 combiners, you only end up with a resultant linear polarisation, at 45 degrees to the two sets of elements.
?
The JH-6-4 is quite complicated, and uses precision value capacitor and inductors, which is why it is so expensive, it also probably requires a bit of tweaking in order to optimise the response curves.
?
I have a much simpler circuit that I reverse engineered from a pair of crossed CSA loops, if you wish to try making your own.
?
Regards,
?
Martin
?
On Mon, Apr 21, 2025 at 02:04 PM, Matthias wrote:
Does anyone know what the JH-6-4 or equivalent is made of or how it works?
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
Hi Fred,
Would you have a schematic for a 90 deg coupler?
On Monday, April 21, 2025, 9:43 AM, Fred M via groups.io <dl4zao@...> wrote: If you want to achieve a horizontal directional pattern with two othogonal horizontal dipoles, you need to combine them with a 90¡ã Coupler. Its then called a turnstile dipole. That's what Rohde & Schwarz does. These 90¡ã couplers. These Couplers have become very expensive. With a bit of luck, you might find one on the surplus market. Or you build it on your own.
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regards, Fred
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Contact DX Engineering. They now own the design.?
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On 21 Apr 2025, at 6:55?AM, dxradio33 <k8fc@...> wrote:
? Good morning out there.? ?I have a Pixel loop and the amp has lost all gain, although RF still makes it through but without any gain.? Does any one know of a source for a schematic of this amp?? I have exhausted every resource that? I can think of but to no avail.? I can fix this guy but I need a road map.
Thanks
Joe K8FC
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
It is a 90 degree hybrid, utilising cascaded phase shift networks, to combine two inputs with a 90 degree phase difference.
?
This is required to produce omnidirectional, circular polarisation, when two linear antennas mounted at right angles are combined.?
?
If you use a standard 0 / 180 combiners, you only end up with a resultant linear polarisation, at 45 degrees to the two sets of elements.
?
The JH-6-4 is quite complicated, and uses precision value capacitor and inductors, which is why it is so expensive, it also probably requires a bit of tweaking in order to optimise the response curves.
?
I have a much simpler circuit that I reverse engineered from a pair of crossed CSA loops, if you wish to try making your own.
?
Regards,
?
Martin
?
On Mon, Apr 21, 2025 at 02:04 PM, Matthias wrote:
Does anyone know what the JH-6-4 or equivalent is made of or how it works?
|
Re: HYBRID QUADRATURE JH-6-4 or equivalent
If you want to achieve a horizontal directional pattern with two othogonal horizontal dipoles, you need to combine them with a 90¡ã Coupler. Its then called a turnstile dipole. That's what Rohde & Schwarz does. These 90¡ã couplers. These Couplers have become very expensive. With a bit of luck, you might find one on the surplus market. Or you build it on your own.
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regards, Fred
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Re: HYBRID QUADRATURE JH-6-4 or equivalent
Hi Hisami,
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I was lucky and could buy such an JH-6-4 coupler second hand. It was still not cheap as I bought it abroad.
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As this is an older device I do not think that anyone is still selling them new but I might be mistaken.
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Here is some information about my antenna refurbishment of an HE003 antenna system. Sorry it is German
but maybe some online translator can help you. In any case there are many pictures in the description which
should help to understand it.
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If you have any questions please let me know.
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Kind regards
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Matthias
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I came across "The R&S HE-015 active antenna" by chance.
In the pictures there, the combiner seems to be "anzac JH-6-4".
I have some home brewed Small Loop, Active Dipole and Mini Whips,?
so I would like to try combine them.
The key component JH-6-4 is also listed on DigiKey, but price is exorbitant!
Does anyone know what the JH-6-4 or equivalent is made of or how it works?
I imagine it is probably a device like this.
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Good morning out there.? ?I have a Pixel loop and the amp has lost all gain, although RF still makes it through but without any gain.? Does any one know of a source for a schematic of this amp?? I have exhausted every resource that? I can think of but to no avail.? I can fix this guy but I need a road map.
Thanks
Joe K8FC
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Re: LF to HF Receiver Multicouplers
Thanks for pointing this out Elio. I have fixed the text.?
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/g/loopantennas/files/VE3PSZ%204-Way%20Multicouple%20General%20Notes.pdf
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HYBRID QUADRATURE JH-6-4 or equivalent
Hi All,
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I came across "The R&S HE-015 active antenna" by chance.
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In the pictures there, the combiner seems to be "anzac JH-6-4".
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I have some home brewed Small Loop, Active Dipole and Mini Whips,?
so I would like to try combine them.
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The key component JH-6-4 is also listed on DigiKey, but price is exorbitant!
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the datasheet here
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Does anyone know what the JH-6-4 or equivalent is made of or how it works?
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I imagine it is probably a device like this.
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What do you think?
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tnx & 73, Hisami 7L4IOU
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Re: LF to HF Receiver Multicouplers
sorry to bother you, but the manual for the "4 way multicoupler" should read:
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[...] Receiver protection can be enabled by shorting JP-1. This will limit the output signal to about +6
dBm, but some distortion may occur just below that. U2 is a low noise, low drop out 10V regulator.
Power to the circuit is provided at J2 and is reverse polarity protected by D4. The internal bias-tee can
be enabled by shorting JP-2 [...]
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in the original text JP-1 and JP-2 are switched....
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_???????? Elio.
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LF to HF Receiver Multicouplers
I just finished another batch of receiver multicouplers. If anyone need one, contact me at thomas.b.seeger@gmail(.com)
As usual, free shipping to anywhere in the world. 73 Tom
/g/loopantennas/files/VE3PSZ%208-Way%20Multicoupler%20General%20Notes.pdf
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Fellas, I've had my Aziloop since last Summer.? I can 100% recommend it.? The sensitivity is great right up to 10 meters.? I'm up there quite often to check propagation.? The circumference of my loops are closer to 30 meters each.? In Masset, I do everything in a big way!!! lol.? ? 73,? Walt
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Hi Rolf,
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I have not tuned above the 16 meter band, but the HF reception lower than this band seems fine. I have mostly tuned from 90 meters to 19 meters, and have not felt the sensitivity was lacking.
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My loop is only slightly larger than the recommended default, so I don't feel I'd have much to gain by increasing the size, since my main interest is generally <10 MHz on shortwave.
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Good luck with your own Azi-Loop!
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Best DX,
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Guy
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Everett N4CY
dxradio33
Guy Atkins