[Amps] Ameritron ARB-704 - Photos and Schematic

[Dan]

yeah by all specs it is safe to NOT run the isolation but seems like the right thing to do .. I bought the one the has the alc line and relay line built in and plugs directly into the acc socket not the replay and alc RCA plugs works perfect thanks for the info
great group here 

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On 02/14/2005 at 9:31 PM Charlie wrote:

>That is really interesting since the Icom tech I spoke to was adamant
>about 
>a key line buffer. Even when I told him the AL-80B sources only +12vdc at 
>100mA he expressly said I needed one or could expect a failure. I
>understand 
>those specs indicate I didn't need one at all. But then the Icom web site 
>and the tech I spoke to said "Yes" I did.
>
>Well I do agree it can't hurt....
>
>Charlie
>Ham Radio - AD5TH
>www.ad5th.com
>Live Blues Music
>www.492acousticblues.com
>
>
>
>
>----- Original Message ----- 
>From: "Dan" <dpipes at earthlink.net>
>To: <Amps at contesting.com>
>Sent: Monday, February 14, 2005 7:48 PM
>Subject: Re[2]: [Amps] Ameritron ARB-704 - Photos and Schematic
>
>
>
>Charlie, Thanks for the reply. Well I called Icom and they said for the 
>newer ie Ameritron 811H types a relay is not needed to isolate since the 
>relay already has a low enough keyer current. However, i asked on the 756 
>Yahoo group and here and was advised it really is a good idea to isolate
>the 
>rig which the one i have does well and a lot cheaper ..  I recalled icom
>and 
>asked again after getting the feeling I really should isolate it and the 
>Icom guy said no not needed at all BUT he agreed would not hurt a thing..
>so 
>I put on my belt AND suspenders <g>
>
>
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>
>On 02/14/2005 at 7:40 PM Charlie wrote:
>
>>ICOM support never answered my email but when I called them up they
>>definitely said to use a key line buffer or expect a failure. I do not
>>know
>>that the ARB-704 is any better than the buffer you already have.  The ICOM
>>tech did mention the ARB-704 as one that he knew worked with the 746 Pro.
>>
>>To answer your question I don't think your missing anything. There are
>>several key line buffers out there..some expressly for the Icom line and
>>others like "Amp Keyer" and the ARB-704 claim to work with "virtually any
>>rig/amp combination"
>>
>>73 / DX
>>
>>-ps my ARB-704 is working fine...now I need the Somalia station!!
>>
>>Charlie
>>Ham Radio - AD5TH
>>www.ad5th.com
>>Live Blues Music
>>www.492acousticblues.com
>>
>>
>>
>>
>>----- Original Message ----- 
>>From: "Dan" <dpipes at earthlink.net>
>>To: <Amps at contesting.com>
>>Sent: Monday, February 14, 2005 6:43 PM
>>Subject: Re: [Amps] Ameritron ARB-704 - Photos and Schematic
>>
>>
>>Trying to learn something here. i really do not understand the need to buy
>>the 704 box. Please let me know what I am missing? As far as isolation I
>>bought a $18.00 9I think) off Ebay. have the solid state relay built in to
>>isolate my 756 Pro II from my Ameritron 811H .
>>
>>The 704 looks great am I missing somethign do i need to upgrade to the
>>704?
>>Even though Icom support advised i needed nothing I checked with this
>>group
>>and was advised to isolate the radioa nd the device I am using works great
>>in doing that.
>>Thanks.  If there really is a reason I may have to look at it thanks
>>Dan
>>
>>*********** REPLY SEPARATOR  ***********
>>
>>On 02/14/2005 at 2:50 PM Charlie wrote:
>>
>>>I installed this key line buffer today and photographed it inside and
>>>out. I
>>>scanned the schematic (which has component values) and posted everything
>>>on
>>>the following web page.  Images and schematic are also available as a
>>>zipped
>>>download of about 1.3M.
>>>
>>>1. http://www.ad5th.com/ARB-704.html
>>>
>>>Charlie
>>>Ham Radio - AD5TH
>>>www.ad5th.com
>>>Live Blues Music
>>>www.492acousticblues.com
>>>
>>>
>>>
>>>
>>>
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>>>Amps mailing list
>>>Amps at contesting.com
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>>
>>
>>
>>
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