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

[Lux, Jim]

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 at contesting.com] On Behalf Of Lux,
> Jim
> Sent: Saturday, December 26, 2020 9:35 PM
> To: towertalk at 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 at 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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