[Amps] Ameritron ARB-704 - Photos and Schematic

[Dan]

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
>
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>
>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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>
>
>
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