Beware of cheap underperforming clones

As of 2022 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

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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

transformers.png
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 ]

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