Thank you. Very interesting

Ik heb berekening gedaan volgens tabel heb ik 2.7 dbi loss voor lmr400 kabel, en telkens -3dbi loss bij passive splitsing. Maar als ik zo een amplifier zou gebruiken is toch deze beide losses/verlies toch niet van toepassing denk ik, wat denkt u ervan mr Frits?

EXCELENT My friend! Just one question, that particular RF POWER AMPLIFIERS what transistors does it employ? Greetings from Argentina

@F_Tim1961

3 ай бұрын

The silicon devices are sold as RF gain blocks or MMICs Many manufacturers sell them - check Mouser for example. Typical mfr Minicircuits, Nxp, Renestas. The will be hard to get in one off qty at a reasonable price. They are not a true R power amplifier.. they won't produce 10 mW out or anything like that. Beware the 1 W or 500 mW type Chinese boards - nearly all of them a are class C amplifiers and will work for CW or FM but won't work for SSB or AM - so useless for HF Ham radio (aside from frequency/design issues).

Wondering what the noise floor and sensitivity of these devices are especially in the HF range? I'd like to use one between the antenna/bandpass filter and a mixer in an HF rcvr.

@andyhowlett2231

2 жыл бұрын

You sure you want that much gain in front of your first mixer on HF? It's a general rule that you should use only enough gain to overcome the filter losses.

Newbie question =do this lna amp work with a chinese mla-30+ antenna?

Typically, there's a gain block IC, like ADL5544. If chinese guys made PCB layout without mistakes, and took not so shitty FR-4 - everything must be ok, in range of datasheet values of course.

Hi ! Can I use something like that , an amplifier for 868-870mhz to improve my receiving signals??

@viocaia

2 жыл бұрын

Try SPF5189 cheap..

Could you share the home made RF generator? A im looking for one from 400 to 470 MHz for 70cm wavelength. thanks

@F_Tim1961

3 ай бұрын

Obviously he (ON4) did not contact you. I don't know of any kit sig generator that will go that high. The commonly used chips for sig gen for HF and VHF is VHF limited. it is the Si 5135. QrpLabs add a Com has a kit that can be pushed as high as abt 220 Mhz. that is operating outside the specs of the Si Chip. DIode type frequency doubling is very problematic at these frequencies. Bear in mind too that most freq generators will output a sq wave or approx sq wave signal. It is up to the user to try to sine it up. Above 100 Mhz that's quite a problem . Qrp labs I think sells an experimental 220 Mhz double tuned filter kit that can nominally sinufy a 220 Mhz signal (along with filters for all the lower VHF and HF bands ) Above that they have nothing. Remember to do any serious diagnosis , you will need an O'scope which is good for these frequencies. They don't come cheap. For amplifying at these sorts of frequencies look up the AD 8009 high speed operational amplifier but I fear that may have a cut off frequency just a little low. No, Dsheet for the AR version says gain of 2 at 440 Mhz. That's a voltage gain not a power gain. TE. Fidler

Worden deze amplifiers heel warm?

Qual a referência desse transitor?

For me an issue is that I'd like to connect a typical FM radio telescopic antenna to a device like this. I suppose I can use a gator clip at the bottom of the antenna, but how do I connect a gator clip to one of these SMA connections. I've noticed that there are about ten different types of connections, all incompatible with each other, except through adapters that are not always easy to come by.

@transporder

3 жыл бұрын

Of course 👍

This can be use to boost Ultrasound signal using 30 meter wire length to komputer?

@mjyanimations1062

2 жыл бұрын

no. this is for radio not ultrasound

Saya dari malaysia jika saya mengunakan amplifier ini pada receive untuk repeater walkie talkie baguskan untuk menguatkan rx repeater saya

Wow that would be great for my wifi router, will it be better if we series the modules?

@on4cco408

3 жыл бұрын

you can't use it for your Wifi router, you can search for wifi amplifier (Rx-Tx) for Wifi Regards

@F_Tim1961

3 жыл бұрын

the issue is that the UHF router has to be able to transmit and receive down the same port. There is no simple method to get a transmit/rx digital out of the router to control a bypass or start preamp signal to put this unit plus other bits into Rx mode.

@Fighter4Street

Жыл бұрын

@@F_Tim1961 Would this work for a 750MHZ Jammer?

@F_Tim1961

Жыл бұрын

@@Fighter4Street whoever did the video is very inconsistent. he makes measurements and writes them out as if they are in dB (power) but they appear to be in dBm. He's saying -0.5dBm ?? power out. That's only 0.9mW. It's inadequate for a jammer. These designs are not optimised for one frequency and are designed in general to go ahead of VHF / UHF receivers. The devices used (semiconductors) may be VHF transistors or MMICs - you can't tell from the photograph . If they are MMICs the design will be more repeatable. It's near impossible to find a broadband 750 Mhz amplifier good to say 100 mW when fed with say - 20dBm in on the commercial market. you may be able to find a class C amplifier for a similar frequency but the L and C components would need to be replaced to bring it on frequency - this is not a trivial job as it would require sourcing and soldering SMD parts.

@F_Tim1961

Жыл бұрын

@@Fighter4Street If you are trying to work out the minimum power required , you need to know the power of the normal signal you are trying to overwrite and you need to know the amplitude and therefore relative power ratio within the receiver device. As a starter if you consider whip antenna a above a ground plane radiating into a hemisphere of area 2 pi R^2 where R is the distance from the jammer power amp to the receiver then the power per m2 can be calculated say at 500 mtrs , a 100 mW signal would be say 63.7 pW per m2 . Let's say that's 44 pW /m2 allowing an efficiency for the antenna of 70%. You don't need to know anything about the receiving antenna on the target device to compare the relative strengths of the direct and jamming signal at the receiver. For example a 5 W direct signal at 4000 m and 100% antenna efficiency comes to 49.7 pW/m2 at the same receiver. (This assumes a similar ground plane antenna). If a Yagi antenna is used for one of the signal paths, the gain of the Yagi must be factored in. The minimum gain of a 3 element Yagi is +7dB approximately based on comparison with an isotropic radiator . Take Antilog 7/10 = 5x effective power in direction of the beam. This is all very oversimplified but it's a start or pointer only.

can for booster transmitter remot control

only 21dB gain for this 2stage? Goes into compression with -20dBm input i guess. Better measure again with -40dBm input.

Can i use it in may modem? From mimo antenna to amplifier to modem?.

@nashly0219

3 жыл бұрын

I have module like that. But say 5-6000mhz the frequency that i want to connect to tower is 2500mhz. Band 41. Is it possible.. the signal would amplified?

@guntherweygers4762

3 жыл бұрын

@@nashly0219 I think in theory it should work...

@nashly0219

3 жыл бұрын

@@guntherweygers4762 thank you.

@MrSwadq

3 жыл бұрын

@@nashly0219 did it work .. planing to order same as yours

@TristanYT1

2 жыл бұрын

@@nashly0219 did it work?

can i use it to wifi remote drone? so the drone can be fly more far from remote?

@kaikart123

2 жыл бұрын

You can add this to Tx if your Tx is 433Mhz

@MultimediaDrive

2 жыл бұрын

@@kaikart123 cara tau Mhz nya remote drone gmn gan?

@kaikart123

2 жыл бұрын

@@MultimediaDrive check your specs

@JAKOB1977

2 жыл бұрын

@@kaikart123 what relevance is 433Mhz.. doesnt it say from 20Mhz to 3000Mhz, so I would guess it would crudely amplify what ever signal up to around that, likely with variable results.

@kaikart123

2 жыл бұрын

@@JAKOB1977 you blind? Watch the vid

Gain is in dB not dBm!

That music is really annoying

video tutorial with background music (useless)😒👎