HL2 transformers

[Dani EA4GPZ]

Hi all,

A question about the HL2 transformers:

T3 (the output transformer) is specified as 4T primary, 1T+1T secondary
on BN43-202. What would be the recommended gauge of the wire?

T1 (low power TX balun) is 1:1 on BN43-2402. Recommended number of turns
and gauge?

T2 (RX input transformer) is 8:1 impedance on BN43-2402. I've seen on
Claudio's page:
http://www.qsl.net/in3otd/ham_radio/Hermes-Lite/Hermes-Lite.html
That 5 and 14 turns with 0.2mm gauge wire are recommended. I have plenty
of 0.25mm gauge wire, so I'll try to wire it with that.

73,

Dani.

[in3otd]

Hello,

T3 (the output transformer) is specified as 4T primary, 1T+1T secondary
on BN43-202. What would be the recommended gauge of the wire?

 

I used a 0.4 mm diameter wire but it's not so critical; there can be some small improvement if you use more wires in parallel for the single-turn windings as it can improve the coupling but it's not really necessary. 

 

T1 (low power TX balun) is 1:1 on BN43-2402. Recommended number of turns
and gauge?

IIRC, I used 6+6 turns of 0.2mm diameter wire - again, I think the wire size is not really critical here

T2 (RX input transformer) is 8:1 impedance on BN43-2402. I've seen on
Claudio's page:
http://www.qsl.net/in3otd/ham_radio/Hermes-Lite/Hermes-Lite.html
That 5 and 14 turns with 0.2mm gauge wire are recommended. I have plenty
of 0.25mm gauge wire, so I'll try to wire it with that.

I remember it was difficult to fit all those turns with the 0.2 mm wire; in case the 0.25 mm does not fit also 4t:12t could do.

73 de Claudio, IN3OTD / DK1CG

[Dani EA4GPZ]

Thanks Claudio,

I have a piece of something that looks like around 0.5mm diameter, so
I'll use that for T3 and 0.25mm for T1 and T2.

73,

Dani.

El 29/01/17 a las 17:09, in3otd escribió:

> Hello,
>
> T3 (the output transformer) is specified as 4T primary, 1T+1T secondary
> on BN43-202. What would be the recommended gauge of the wire?
>
>
> I used a 0.4 mm diameter wire but it's not so critical; there can be
> some small improvement if you use more wires in parallel for the
> single-turn windings as it can improve the coupling but it's not really
> necessary.
>
>
> T1 (low power TX balun) is 1:1 on BN43-2402. Recommended number of
> turns
> and gauge?
>
>
>
> IIRC, I used 6+6 turns of 0.2mm diameter wire - again, I think the wire
> size is not really critical here
>
>
> T2 (RX input transformer) is 8:1 impedance on BN43-2402. I've seen on
> Claudio's page:
> http://www.qsl.net/in3otd/ham_radio/Hermes-Lite/Hermes-Lite.html

> <http://www.google.com/url?q=http%3A%2F%2Fwww.qsl.net%2Fin3otd%2Fham_radio%2FHermes-Lite%2FHermes-Lite.html&sa=D&sntz=1&usg=AFQjCNHc1F-xDMkaBfHrF1Z983lDEg0LvQ>

>
> That 5 and 14 turns with 0.2mm gauge wire are recommended. I have
> plenty
> of 0.25mm gauge wire, so I'll try to wire it with that.
>
>
> I remember it was difficult to fit all those turns with the 0.2 mm wire;
> in case the 0.25 mm does not fit also 4t:12t could do.
>
> 73 de Claudio, IN3OTD / DK1CG
>

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[Steve Haynal]

Hi Dani,

For the RX balun, an alternate is https://octopart.com/search?q=MABA-010143-FLUX18 This is what Jim used on the v1.42 frontend so it has been tested. I will eventually update the bom to include this as an alternate.

73,

Steve

KF7O