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Amplifiing 433Mhz signal?

 
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Amplifiing 433Mhz signal?
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Rplink3r
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Post Amplifiing 433Mhz signal? Reply with quote
I found an old Benefon system, which has a big amplifier module for 400-440Mhz,
the module is MHW720A1, now i have a question if it is possible to connect this module to amplify the signal of a 433Mhz digital transmitter?

MHW720A1 datasheet:
http://www.datasheetcatalog.com/datasheets_pdf/M/H/W/7/MHW720A1.shtml

Transmitter datasheet:
http://www.svet-el.si/download/VF%20data%20sheet%20433.pdf

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Fri May 02, 2008 11:56 am View user's profile Send private message
pcs
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Post Reply with quote
Not recommended.

One reason:
433MHz modules (receivers) are quite crappy and you've got hundreds of these units nowadays
in everything from wireless car keys, remote control thermometers etc etc etc.

What you'll do is wipe out all of these in considerable range. Those on your channel and all neighboring
channels (due to crappy receivers). You will eventually attract attention of those who could put you
in your very private room with metal doors. Comes with a hefty price tag, too.

So be smart and avoid this.

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Marko - PCS Electronics
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Sat May 03, 2008 11:44 am View user's profile Send private message Visit poster's website
Rplink3r
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Post Reply with quote
Is it posible to use this for model cars, with some kind of directional antenna, this is ment to be used on an open field, only for car models, no one far araound ?!?.
Anyway, sorry i didn`t know about Radio laws in our country, i live in Slovenia.

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Sun May 04, 2008 7:31 pm View user's profile Send private message
pcs
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Post Reply with quote
if you do not exagerate with output power, yes, maybe.

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Marko - PCS Electronics
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Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Sun May 04, 2008 7:58 pm View user's profile Send private message Visit poster's website
Rplink3r
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Post Reply with quote
I wouldn`t. But i don`t know how to connect the module and the amplifier ? Impedance matching? Output attenuator ?, if i buy 0,5W transmitter module maybe no impedance matching ?


http://trgovina.svet-el.si/productdetail.php?prodid=17056

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Mon May 05, 2008 7:23 am View user's profile Send private message
pcs
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Post Reply with quote
I don't believe that tiny thing produces 0.5W, maybe 50-100mW.
Make sure your amplifier works with such low drive signal. If this
50-100mW is too much, use attenuator.

And use a low pass filter on the output!

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Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Mon May 05, 2008 10:42 am View user's profile Send private message Visit poster's website
Rplink3r
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Joined: 14 Mar 2005
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Post Reply with quote
Thanks for info. When i'll have time, i'll do some experiments with this thing.

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Fri May 09, 2008 10:44 am View user's profile Send private message
pcs
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Post Reply with quote
Don't forget to post here how it works out for you, if you get stuck
let me know and I'll try to help.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Fri May 09, 2008 10:47 am View user's profile Send private message Visit poster's website
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