19:52 <bvernoux> hello

19:52 <bvernoux> after very long time I have finally populated 4 SMA connectors on 6Layers_trl-board_microstrip_v0_1_OSHPark

19:52 <bvernoux> and the results are very good

20:09 <bvernoux> For those interested https://hydrabus.com/6Layers_trl-board_microstrip_v0_1_OSHPark/VNA_Measurements_HP8753D/

20:10 <bvernoux> It does not include report just s2p measurements with details on setup + photo of the board

20:10 <bvernoux> Test2_CalKit_SN0643_Thru_Reference.s2p is the Reference which can be used to check exact rf loss with other measurements

20:10 <bvernoux> using deembedding ...

20:12 <bvernoux> like we can see with 76mm line we have about 3dB S21 RF loss in worst case which is very good

20:19 <Degi> At which frequency is the worst loss?

20:31 <bvernoux> 6GHz

20:31 <bvernoux> it is also the limit of my HP VNA anyway

20:32 <bvernoux> anyway more the frequency is high higher is the loss

20:32 <bvernoux> it is why here it is interesting to check the OSHPark 6 layers PCB

20:33 <bvernoux> and the results are very good and can be compared to expensive RO4350B ...

20:35 <bvernoux> less than 3dB RF loss on 76mm line is very good

20:36 <bvernoux> on FR4 I think it will be not far to 6dB with same spec

20:37 <Degi> Hm, did you subtract the connector loss from that?

20:37 <bvernoux> no

20:38 <bvernoux> it is why I say it is very good performance ;)

20:38 <Degi> oh yes

20:38 <bvernoux> in fact I have the reference s2p with Thru

20:38 <bvernoux> which can be substracted

20:38 <bvernoux> to be used as reference for de-embedding and like that you have exactly the RF loss of the PCB line

20:39 <bvernoux> which shall be max 2dB

20:39 <bvernoux> we gain something like 0.8 to 1dB max in fact as the connectors are the best we can find for SMA which are very good up to 26.5GHz(on the paper)

20:40 <bvernoux> it is 8euros/connectors ;)

20:40 <bvernoux> they are very well matched by default too

20:41 <Degi> They sound pretty nice

20:41 <bvernoux> I have checked it with Impedance on S11 it is very nice and Z average near 50 Ohms

20:41 <Degi> neat

20:41 <bvernoux> you can check that with provided s2p files anyway

20:42 <bvernoux> Also here I have top performance because it is Microstrip

20:43 <Degi> The SMA mounting looks interesting

21:18 <bvernoux> I have found this interesting online tool which can use s2p file for de-embedding

21:18 <bvernoux> https://snpview.com/

21:18 <bvernoux> It also display the TDR

21:19 <bvernoux> which show that the connectors are very well matched to 50ohms and also the 76mm line is well matched to 50 Ohms too

22:19 <bvernoux> Degi, I have done the Simulation with OSH park 6 layers specifications and RF loss shall be about 1.6dB and I obtain about 2dB so it is pretty close especially as the Simulation consider perfect materials ...