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Dual Transformers on NanoVNA V2


Latimergrp 2020/12/09 11:20

Guys,

Anyone have an idea of these transformers on the NanoVNA V2?

It looks like a SOT 23-5 part, but no idea on model so I can pull a product sheet.

Looking to find the frequency response of the transformer and of the entire directional coupler. It looks like its a resistive directional coupler, but not sure.

Ran a simulated circuit based on the design shown in the schematics, and the results were not great. I assume this will change, once I can account for the cascaded transformers.

I pulled the T551 transformer data sheet as it was referenced in the schematic, but these are not the same.

Working on some upgrades, but want to be sure this is in fact suitable for higher frequency operation.

Thanks,

Jay

DiSlord 2020/12/09 23:32

[Edited Message Follows]

V2 can use
cx2156nl looks like this
( https://cdn.discordapp.com/attachments/777578628879351818/777583425346469927/Screenshot_from_2020-11-15_17-18-45.png )

617DB-1023=P3 looks like this
( https://cdn.discordapp.com/attachments/777578628879351818/777583855296708619/Screenshot_from_2020-11-15_17-20-18.png )
there are also TC1-1-13M+ compatibles that look similar to this
( https://cdn.discordapp.com/attachments/777578628879351818/777584085169471508/Screenshot_from_2020-11-15_17-20-59.png )

[ 20:22 ]

DiSlord 2020/12/09 23:32

V2 can use
cx2156nl looks like this
( https://cdn.discordapp.com/attachments/777578628879351818/777583425346469927/Screenshot_from_2020-11-15_17-18-45.png )

[ 20:20 ]
617DB-1023=P3 looks like this
( https://cdn.discordapp.com/attachments/777578628879351818/777583855296708619/Screenshot_from_2020-11-15_17-20-18.png )

[ 20:21 ]
there are also TC1-1-13M+ compatibles that look similar to this
( https://cdn.discordapp.com/attachments/777578628879351818/777584085169471508/Screenshot_from_2020-11-15_17-20-59.png )

[ 20:22 ]

Predrag Pavošević 2020/12/10 11:47

Hi all,

sch definition:

[image: image.png]

BR

Predrag, 9A3QV

On Thu, 10 Dec 2020 at 08:33, DiSlord <dislordlive@gmail.com> wrote:

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