[Amps] Ameritron ARB-704 - Photos and Schematic

[Charlie]

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>


*********** REPLY SEPARATOR  ***********

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
>>
>>
>>
>>
>>
>>_______________________________________________
>>Amps mailing list
>>Amps at contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
>
>
>
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