Re: [TowerTalk] 4 square - collins hybrid measurements/component values

["Lux, Jim" <jim@luxfamily.com>]

On 12/26/20 8:15 PM, Tim Duffy wrote:
> Hello Jim:
>
> "All the parasitics"???
>
> 73
> Tim K3LR

most practical implementations of the hybrid will have:

1) leakage inductance in the transformer (i.e. coupling factor isn't 1)

2) loss in the inductor (from R in the winding, and loss in the core)

3) C between the windings (basically in parallel with the lumped Cs)

If someone has actually measured one on a VNA, that would be useful.


> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Lux,
> Jim
> Sent: Saturday, December 26, 2020 9:35 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] 4 square - collins hybrid measurements/component
> values
>
> On 12/26/20 5:55 PM, Haring family wrote:
> > No need to duplicate... check ON4UN/5th. He has a model of the Collins
> > coupler included that Roy W7EL made up for EZNEC, I think. Dan AC6LA may
> > have something for it for AutoEZ also.
> >
> > regards,
> >
> > Dave N3AC
> I have the 3rd edition which doesn't have the models. But what I'm
> really looking for is measured data on a real box (with all the parasitics).
>
>
> > On Sat, Dec 26, 2020 at 2:37 PM Lux, Jim <jim@luxfamily.com> wrote:
> >
> > > I'm putting together some models and I was wondering if someone has
> > > actual measured 4 port data for the LC Collins hybrid.
> > >
> > > I've got some sample capacitance and inductance values
> > >
> > > (e.g. for 80m, 436 pF and 2.18 uH)
> > >
> > > I'm assuming that the transformer is "well coupled" so the mutual L is
> > > almost the same as the inductance of the winding.
> > >
> > >
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