TSP

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@Thesignalpath 2 ай бұрын

*Thanks to everyone who support the channel! It goes a long way. I only charge a fraction of my content to Patreon & all my videos are free to everyone. You can support the channel via Patreon or PayPal in the video description.*

@TheChillieboo 2 ай бұрын

I love how you can make repairing a broken fuse into a thoroughly entaertaing and educating video!

@w2aew Ай бұрын

With all those proximity and cavity effects, it makes you wonder how effective all of the tuning adjustments really are once the unit is closed up (since the adjustments are made when it is open...)

@schwinn434 Ай бұрын

Thank you for your time and effort in creating this video!

@loslos2937 Ай бұрын

Content like this is worth having on KZbin. ❤

@ammarbhayat715 Ай бұрын

Cant wait for the noise figure video. I want to learn about noise matching for LNAs, how can we use tuners and noise figure analyzer to optimize LNA noise figure. On the PNA-X I have seen many exotic measurment types related to noise on that instrument, for example something called noise correlation. Can we touch on those topics too? Also can we learn about defining and measuring LNA sensitivity. I don't understand also how adding input attenuation raises the noise floor on a spec A. What happens if we just keep adding attenuators??? Truly I am interested in LNAs for radio telescopes and deep space networks

@Nik930714 Ай бұрын

If i design something like that and give this design to production, they will fly from halfway across the world to kick my ass. This is a nightmare to assemble ever for a one off prototype. I cant imagine how qualified the production staff need to be in order to manufacture this.

@dtiydr Ай бұрын

I clicked thumbs up even before I started to watch the video.

@xDevscom_EE Ай бұрын

It's awesome to see this "low frequency" amplifier internal design, with all those capacitors and inductors around clearly visible as individual components. In higher frequency stuff you often may forget about all those additional L,C and Z's all around the "useful" circuit since they are much smaller or often even part of PCB/chip design. Also idea for future video, perhaps, an introduction to the typical performance parameters of RF amplifiers. IP3, PSAT and other RF "speak" might be bit confusing for junior starting engineers :)

@floooowsn Ай бұрын

Yes please!!!

@jspencerg Ай бұрын

Excellent step through of repair process. Perfect education about preserving dut with signal control. Wonderful demonstration of verifying data sheet specifications. I think this shows how mini circuits was a quality company before they switched to putting everything into a single chip. They published the real performance of the product.

@NebukadV Ай бұрын

You seriously lost me on this one - still worth a big thumbs up!

@Thesignalpath Ай бұрын

Thanks - which part were you lost at?

@NebukadV Ай бұрын

@@Thesignalpath (O)IP3, TOI and IM3 are things I never came across. It's totally fine, that you did not explain those things in detail. Your videos are obviously focused towards RF topics, whereas I come from a digital- and power-electronics background. Still: Thanks for asking!

@Thesignalpath Ай бұрын

No problem. If you do a little reading on those terms then hopefully the video will be more helpful. I am also trying to diversify my video contents.

@vincei4252 2 ай бұрын

6:30 Varactors? I had a double take. Don't you mean variable caps or varicaps? It's a nice looking amp with special eBay pricing, I checked ;-) I'd have been interested in seeing a reversed circuit diagram but can sort of guess what it looks like. Wow, 35 watts quiescent.

@notstorm208 Ай бұрын

Whats the difference?

@timun4493 Ай бұрын

@@notstorm208 varactors are diodes used as voltage controlled capacitors, the devices in the video are mechanically adjustable capacitors, I think Shahriar just misspoke

@notstorm208 Ай бұрын

@@timun4493 Ahh I get it now.

@miroslawkaras7710 Ай бұрын

What is the date code of that amp. That is really old vertion - propably one of the first revision. There was at list 2 more revision of that amp. I used couple of this over the years. I do not remember if any of the fail on my bench. As a preventive measure I always used sfety attenuator on input, to prevent accidental overdrive.

@mcie6306 Ай бұрын

Thanks for that This is a great video

@miroslawkaras7710 Ай бұрын

Prety goood job on the measurement. One note: for the intermodulation it will be grate to have at list 18dB margine between setup and the DUT readings. If I am correct that give wors case better then 0.1dB error. I wonde what is the "sweet spot" input power for intermodulation on the Siglen SA. Most of Keysight SA that around -36dBm.

@garci66 Ай бұрын

Nice video and good explanation as always! BTW.. was that a "project farm" reference with the "were gonna test that" when going over the datasheet ? ;-)

@Thesignalpath Ай бұрын

Yes it was! :)

@citizenrich Ай бұрын

Awesome video. What sort of shielding do you recommend for such enclosures? Any examples?

@Darkknight512 2 ай бұрын

Higher noise figure at around 490 MHz, maybe a UHF TV station or something leaking in?

@Thesignalpath Ай бұрын

Pretty close!

@Ziferten Ай бұрын

@@Thesignalpath Wireless mic that you're using?

@tomoto7315 Ай бұрын

@@Thesignalpath Left the SSG on?

@Thesignalpath Ай бұрын

Yes!

@laser-sj Ай бұрын

My only complaint about this video is the lack of feline content 😂

@ZlayaCo6aka 2 ай бұрын

Check the bias currents. Someone may have fiddled with the adjustment pots trying to improve linearity and overdid it.

@erwe1054 Ай бұрын

это же хотели получить чистый аудиофильский класс А

@witeshade 2 ай бұрын

Isn't it kinda bad that it has so much more gain than it says on the box? It seems like if you weren't careful you could end up frying frying a front end by hitting it like 10dB harder than you expected

@Darkknight512 Ай бұрын

@@witeshade You should be setting up to the saturation with decent margin, not the gain which typically varies much more.

@P.Barros Ай бұрын

Why is the Noise Figure so bad at lower frequencies (below 300 MHz) ??

@BartKus 2 ай бұрын

Who makes your fancy blue lab cables?

@Singerj181 Ай бұрын

Junkosha

@Thesignalpath Ай бұрын

Junkosha.

@electronicbob6237 Ай бұрын

1 GHZ is pretty low frequency...😁....yes...for you..!!!

@der.Schtefan Ай бұрын

Sometimes I imagine what would happen if one of these scopes would time travel to the 1940s

@xfxox Ай бұрын

$1.5k lol

@joes5669 Ай бұрын

That's a great price. They're probably at least 2X that today.

@xfxox Ай бұрын

@@joes5669 just why? transistors are $5/piece, linear PSU maybe $50... 🤔

@joeambly6807 Ай бұрын

@xfxox if you do electronics and only consider the cost of raw components (which are wild off too) then maybe you have never designed a product, much less a low volume one.

@xfxox Ай бұрын

@@joeambly6807 you can't put 1400% margin on a 100$ product it's just scam imo.

@xfxox Ай бұрын

@@joeambly6807 I think putting 1400% of margin on a 100$ unit is a scam 🤔