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HELP ME PLEASE !!! Trouble with FM PRO I (humm noise)

 
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HELP ME PLEASE !!! Trouble with FM PRO I (humm noise)
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ssi
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Joined: 22 Dec 2005
Posts: 2

Post HELP ME PLEASE !!! Trouble with FM PRO I (humm noise) Reply with quote
Hello !!!

I'm buy FIVE FM pro I but I have a problem !

I create DIPOLE 1/4 wave antenna with coaxial cable RG8.

When I put (The OUTPUT Gain at minimum) all it's okay.

When I put the Output GAIN at 1/4 or 1/2 power or Full power I have a VERY BIG Hummm NOISE in the sound Why ???

And I have a BUZZ sound on my transmitter !!!

I use switching power supply 15 VDC

THANKS IN ADVANCE FOR YOUR ANSWER !!!

Nick Lavoie
SSi Informatique
Thu Dec 22, 2005 9:07 pm View user's profile Send private message
pcs
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
What is FIVE FM pro I ?

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Thu Dec 22, 2005 11:02 pm View user's profile Send private message Visit poster's website
ssi
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Joined: 22 Dec 2005
Posts: 2

Post WHAT !!! ??? Reply with quote
I buy (5X) MAX PRO I - 7W

YOU UNDERSTAND NOW !!!

_________________
HELLO !!!
Fri Dec 23, 2005 4:23 am View user's profile Send private message
pcs
Site master
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
The brum problems are usually when:

1.) MAX PRO I is not in a metal enclosure.

2.) Your SWR is not that good and you have RF radiation
on the outer shell of your coax.

3.) Antenna too close to transmitter and audio setup.

4.) Antenna / Coax too close to power supply.

5.) Power supply not RF shielded/blocked. Try using battery
and see if it makes any difference.

6.) Ground loops with your audio stuff. Disconnect audio jack,
if the hum is gone than you've got a problem with your audio setup.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Fri Dec 23, 2005 12:48 pm View user's profile Send private message Visit poster's website
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