⭐ Inexpensive 50 ohm Feed Through Terminations

Подписаться 986

Просмотров 16 тыс.

50% 1

I cover why you need to use a feed-through termination with an example. I review a new inexpensive model available on Amazon and eBay. I compare it to ones from Tektronix and HP. I show them in use on an oscilloscope, measure the input match, show how to improve the match, and discuss why you would or would not choose one over the other.
You can download the data and graphs in excel format and find a copy of the slides here:
chrisgrossman.com/yt/0007/

Опубликовано:

14 июл 2019

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 48

@ohaya1

When I saw the ringing, the I loudly said 'Yoooo...!'

@stereophotog Год назад

Chris, thank you so much for producing this excellent video. I learned so much thanks to your thorough evaluation and tests. keep it up. I will be following you from now on.

@mariovano Год назад

Excellent demonstration! Keep up the good work!

@JWH3 2 года назад

Thanks, the details of reading a Smith Chart are still difficult for me but you spelled things out well here and the key takeways were simple enough without the nitty gritty details :) Learning about the attenuator part was something I'd not considered.

@vidasvv 3 года назад

EXCELLENT video Chris, TNX 4 the upload !

@CrispyCircuits Год назад

Thank you! I ran into this video by accident. I had already bought exactly the same things you showed. I am taking Mr Carlson's Lab fix anything series and I was confused about him using a 47 ohm resistor for termination. Then I realized 47 meant 50. Your explanation was fantastic. Thanks, I subscribed.

@adpro57 3 года назад

Thanks Chris: I was looking for a good alternative to those $45 feedthroughs and it looks like you gave me exactly what I was looking for!

@KG4JYS

You should give the black plastic ones a shake. My best load is one of those. It's rated DC-1Ghz but works very well up until 2.25Ghz, according to my libreVNA.

@maxewdmaxe4337 4 года назад

Great Chris, thank you very much. I just wrote an article (5/2010) in the german Ham magazine about a Zo-probe with a 50 Ohm feedthrough. So your measurements fits perfectly to that. //DK9ZY//

@NavinF 2 года назад

Amazing and straight to the point. Now I gotta redo some PSU noise measurements I made with 50ohm terminated coax. I wonder if there is a practical way to get reasonable return loss at 200mhz while maintaining 500uV sensitivity without an expensive and finicky differential amplifier

@PapasDino 5 лет назад

Found your channel by pure accident! Thanks for the great comparison, very informative! You've got a new subscriber...

@rpbale 2 года назад

Great video. It really illustrates the need for termination. Is it possible to make a precision 50 ohm bnc cable at home? I see the Tek ones for $350-$450. Crazy price

@pierrejonsichon1482 3 года назад

"Im not interested in those plastic "Chinese" ones." - this statement though LOL

@Flamenawer 2 года назад

I really think it is a thing that should have more echo, (the attenuator + load one) and the channel too.

@harrygaul3664 4 года назад

This is a very interesting video. Thank you for sharing, especially the impact of placing an attenuator just upstream of the 50 ohm terminator. I am wondering how well a BNC tee with a 50 ohm BNC terminator works? It is also a low budget approach. It is my usual approach when using scopes that do not have a built-in 50 ohm termination.

@thebicycleguy7263 2 года назад

I tried to perform this myself but couldn't. What exactly and how is the un-shown 'wire' inductance added?

@andrewverran3498 2 года назад

Hi Tony, wondering if you can help..i have an old Marconi 100db STEP attenuator..unfortunately it has 75ohm input and output..since i would like to use for the 27mhz cb band can you please suggest how i might convert its input and output to 50ohm.?

@antoniohenriques7156 4 года назад

You should get your ham license! 73

@gabecocco6589 3 года назад

Great video Chris. I just ordered two of those terminations on Amazon. Do you think it would be feasible to replace the two 1/8 watt resistors with two 1/4 watt resistors? It they would fit, one could double the power handling capabilities.

@Flamenawer 2 года назад

Hi, I'm absolute beginner and I have a OWON HDS2102S 100Mhz oscilloscope and a LiteVNA 6ghz , I have good attenuators and 50ohm loads and cables everything rated 18ghz.