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Freebander
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connecting a linear


hi guys can ye help iv a yaesu fL2100b linear amp and i need info how to connect it to my icom 7400 do i need a buffer relay in line between radio and amp id be greatfull for any help

  DAVE 29FB129
28/Oct/2010, 7:29 pm Link to this post Send Email to DAVE129   Send PM to DAVE129
 
yamanx1 Profile
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Re: connecting a linear


Wow Dave! fab amp emoticon

First off, my strong advice, which I may be teaching you to suck eggs, but please make sure ALL your coax and patch lead connections are sound before using this kind of welly, all your kit needs to be tip top and double checked, plenty of earth. The voltage here is massive!

You will need a switch lead, the keying of the mic wont activate this amp, its activated by a seperate switch, the lead is usually a phono type lead between radio and amp. Please read all the manuals for both radio and PA as there will be some settings on the radio that will be important when using large amps.

Yes, to your question it is best to have an in line protection, but wont stop you using the PA, I dont have one in line here, but it is probably a good idea.

Look forward to hearing you more often then emoticon

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By all means think yourself big, but never think others small.... R.F.Scott
28/Oct/2010, 9:22 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
DAVE129 Profile
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Freebander
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Re: connecting a linear


tnx for reply all my patch leads are new and i am havin a prob with earth as the shack is at the front of the house and earth rod 75ft away as i stated on another post anyway iv looked throught both manuals and looked on the net and its givin me no advise or instructions as to hook up this amp to my 7400 safely so much for the internet its in the manual for the radio the alc input is 0v-4v & the send relay is 16v/[sign in to see URL]
the amp keying line is rated @ 16v / 125ma all i want to know can the linear be connected to radio with or without relay cable

 73s DAVE 29FB129
29/Oct/2010, 8:31 am Link to this post Send Email to DAVE129   Send PM to DAVE129
 
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Re: connecting a linear


You dont "need" an ALC cable but you do need the relay connection. (phono style plugs usually) The ALC cable is design so you cant overdrive the l;inear in SSB mode, mine is turned off anyway emoticon So 16v to 16v it sounds like.

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By all means think yourself big, but never think others small.... R.F.Scott
29/Oct/2010, 4:42 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
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Re: connecting a linear


Ok looking into this further, it appears (You'll just need to double check the manual)

The far left connection is the relay VE+ marked RW and the next cennection is VE- for the relay marked E.

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It then appears from this image the 7400 has capacity for two amps, for different bands I'm guessing. Check the manual, but lets say we're going to connect to amp 1, using a phono style pug check when keying up that the VE+ is the centre, probably is, then connect the centre pin to the VE+ on the amp and the outer to the VE-. Check the voltages, but this should crank up the linear. Use CW and low power to start bwith. Tune amp for max output before cranking up driver to 100W emoticon

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Last edited by yamanx1, 29/Oct/2010, 4:57 pm


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By all means think yourself big, but never think others small.... R.F.Scott
29/Oct/2010, 4:55 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 
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Freebander
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Re: connecting a linear


well this is a amazing reply and i thankyou very much for all your help i sent a email to ameritron usa to ask the tect support a question about buffer cables and do i need 1 so i explained what i was doin and they emailed me back sayin
use 1 phono lead cut 1 end off use the inner core and that goes to screw R then the outter core the screen goes to the E screw and the other end with the phono goes to the send [ relay ] socket on the radio now does that seem like the prob is solved i hope so
 73s and tnx again DAVE 29FB129
29/Oct/2010, 6:58 pm Link to this post Send Email to DAVE129   Send PM to DAVE129
 
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Re: connecting a linear


Ha! So I was correct emoticon

Nice one Dave look forward to hearing you soon then, very loudly emoticon

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By all means think yourself big, but never think others small.... R.F.Scott
30/Oct/2010, 2:57 pm Link to this post Send Email to yamanx1   Send PM to yamanx1
 


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