Lrl from Italy

[FrancoItaly]

Bc170a transistor equvalant

I think any NPN BC...A :

https://alltransistors.com/transistor.php?transistor=22398

With low noise : BC239 or BC209

[Sreekumar]

Thank you brother,please tell me your first lrl "c6" variable capacitor equialent options?

[FrancoItaly]

Thank you brother,please tell me your first lrl "c6" variable capacitor equialent options?

I don't remember which lrl you are referring to, post the diagram.

[Sreekumar]

Hi All
I post here all the information to build a working (for me) Lrl, the photo is not related to the last Lrl because now I'm not in Italy ( the 3 stylus antenna are not necessary).

Best Regards

This lrl

[FrancoItaly]

This lrl

Post the wiring diagram, I cannot understand which one you are referring to, however the alternative to the variable capacitor is a varactor.

[Sreekumar]

Hi All
I post here all the information to build a working (for me) Lrl, the photo is not related to the last Lrl because now I'm not in Italy ( the 3 stylus antenna are not necessary).

Best Regards

http://www.longrangelocators.com/for...1384343478this

[Sreekumar]

Varactor value?

[FrancoItaly]

Varactor value?

I can't find the scheme, can you post it?

[Sreekumar]

Sorry brother,l using mobile phone

[Sreekumar]

Your first lrl "5mhz schematic."

[FrancoItaly]

Your first lrl "5mhz schematic."

the scheme is in my first post where there is the photo, I post it here again with the value of the components. However, I do not recommend not making it, it is too critical to work in self-oscillation, for this reason I made the version with the quartz oscillator. I post also here too.

[Sreekumar]

Thank you,l"am build this 5mhz lrl,output voltege is 7.7v,this lrl is ok?

[FrancoItaly]

Thank you,l"am build this 5mhz lrl,output voltege is 7.7v,this lrl is ok?

No, it is better in the 4-6 volt range, otherwise if the amplitude is too high it would be almost insensitive, in fact if the amplitude is already normally at maximum it could not reveal a further increase.

[Sreekumar]

What should i do next?

[FrancoItaly]

What should i do next?

The purpose of C6 is to adjust the gain, you can try acting on C6, if it is not enough increase R5 put 1.2 K or 1.5 K.