eHam

eHam Forums => Elmers => Topic started by: IK8OZV on February 12, 2019, 01:57:45 PM



Title: How to connect correctly an Amplifier
Post by: IK8OZV on February 12, 2019, 01:57:45 PM
Hello,
i own an Amplifier BLA350 that i have to connect to a MAGNUM 3000DX Antenna tuner
and a YAESU FT-920 radio but i am not quite sure if the connections are correct.
Actually i have made the following connections
The antenna from the roof is connected to the "A1" connector of the MAGNUM 3000DX Antenna tuner.
At the "TX" connector of the  MAGNUM 3000DX Antenna tuner, i have connected it to the "ANT" of the BLA350 Amplifier.
At the "RTX" connector of the BLA350 Amplifier,  i have connected it to the  "ANT" of the  Yaesu FT-920 radio.
Are these connections corrected?


Now on the back of the  BLA350 Amplifier there are two RCA connectors named, one "PTT" and the other "ALC".
How the shoud be connected on the back of Yaesu FT-920 radio so i can use the amplifier without using the VOX also in mSSB modes?
Any help will be really appreciated
72's de Enzo IK8OZV



Title: RE: How to connect correctly an Amplifier
Post by: KE6EE on February 12, 2019, 04:06:37 PM
Le tue connessioni sono corrette. Collegare il PTT Yaesu all'amplificatore PTT.


Title: RE: How to connect correctly an Amplifier
Post by: IK8OZV on February 13, 2019, 11:05:42 AM
Thanks i have to connect the PTT Connector of the PA to the PTT connector of the radio?
Is it correct?
What about the ALC connection?
Thanks
Enzo


Title: RE: How to connect correctly an Amplifier
Post by: K4HB on February 13, 2019, 01:38:10 PM
Thanks i have to connect the PTT Connector of the PA to the PTT connector of the radio?
Is it correct?
What about the ALC connection?

(https://i.imgur.com/8GLPAFF.jpg)

Download the manual for the FT-920  Here (http://www.radiomanual.info/schemi/YAESU_HF/FT-920_user.pdf).

Download the manual for the amp  Here (https://www.manualslib.com/manual/638631/Rm-Italy-Bla-350.html?page=7#manual).


Title: RE: How to connect correctly an Amplifier
Post by: IK8OZV on February 13, 2019, 02:01:54 PM
Thanks i have to connect the PTT Connector of the PA to the PTT connector of the radio?
Is it correct?
What about the ALC connection?

(https://i.imgur.com/8GLPAFF.jpg)

Download the manual for the FT-920  Here (http://www.radiomanual.info/schemi/YAESU_HF/FT-920_user.pdf).

Download the manual for the amp  Here (https://www.manualslib.com/manual/638631/Rm-Italy-Bla-350.html?page=7#manual).

So i had connected in the wrong way?
I have connected the ALC of the PA to the EXT ALC of the Radio and the PTT of the PA to the TX GND of the Radio.
Are they OK in this way or i need to change them in other ways?
Thanks
Enzo


Title: RE: How to connect correctly an Amplifier
Post by: K4HB on February 13, 2019, 02:34:07 PM

So i had connected in the wrong way?
I have connected the ALC of the PA to the EXT ALC of the Radio and the PTT of the PA to the TX GND of the Radio.
Are they OK in this way or i need to change them in other ways?

If you have it connected as you described and as in this illustration, you have it connected correctly. ALC is not required for the amp to work, it prevents you from overdriving your amp.

(https://i.imgur.com/1GvxUec.jpg)


Title: RE: How to connect correctly an Amplifier
Post by: IK8OZV on February 13, 2019, 10:19:32 PM

So i had connected in the wrong way?
I have connected the ALC of the PA to the EXT ALC of the Radio and the PTT of the PA to the TX GND of the Radio.
Are they OK in this way or i need to change them in other ways?

If you have it connected as you described and as in this illustration, you have it connected correctly. ALC is not required for the amp to work, it prevents you from overdriving your amp.

Apologise Hal as I said above, I have connected the PTT of the PA to the TX GND of the Radio.
Is it correct or I have to move it to the PTT RCA connector of the radio as I do not see any arrow on the picture were to connect correctly?
When in SSB if I just press the PTT on the Mike the PA has to go on air or I need to talk in the
Microphone to let the PA going on air?
Thanks a lot


(https://i.imgur.com/1GvxUec.jpg)