Give a call to Ten Tec support. I think you can get the board for free and
install it yourself. It's actually very simple and requires no soldering,
cutting, etc.
BTW...My O2 came from that same production run, which I believe was the
first one.
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Fred Mott" <fredmott@zoominternet.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Friday, May 01, 2009 7:41 PM
Subject: Re: [TenTec] Orion 2 Headphone RFI Filter
> Where can I find documentation on the Orion II Headphone RFI Filter? My
> rig
> was shipped on 12/13/05 and received 12/15/05. I have made no
> modifications, only firmware updates. MY O2 needs this modification. Fred,
> AB8AH
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of pfizenmayer
> Sent: Friday, May 01, 2009 12:36 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Orion 2 Headphone RFI Filter
>
> I do not have time right now to dig out the schematic and see if this
> would
> allow an external check - but I can tell you the filter adds 24 ohms DCR
> in
> each side of the headphone output. If you want to do the exercise -
> measure open circuit voltage of the sidetone - then load with 32 ohms or
> so
> and measure the voltage again - You can calculate source impedance . Do
> this
>
> on both and you will tell if it has the filter . A no filter will be at
> least 24 ohms lower output impedance.
>
> I think I have that data - but will not have time until this evening to
> dig
> it out or remeasure.
>
> 73 de Hank K7HP
>
> ----- Original Message -----
> From: "Dick Williams" <k8ztt@mho.com>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Friday, May 01, 2009 7:47 AM
> Subject: Re: [TenTec] Orion 2 Headphone RFI Filter
>
>
>> Doug,
>>
>> I am not sure when the started; but if you don't receive a satisfactory
>> answer on here, since you installed one in your radio, it might be
>> easiest
>> to take a quick look inside your friends radio. That way you can verify
>> for
>> sure if one is (or is not) installed.
>>
>> Dick K8ZTT
>>
>>
>> ----- Original Message -----
>> From: "Doug Turnbull" <turnbull@net1.ie>
>> To: <tentec@contesting.com>
>> Sent: Friday, May 01, 2009 7:48 AM
>> Subject: [TenTec] Orion 2 Headphone RFI Filter
>>
>>
>>>I have a friend who is purchasing an Orion 2 from another EI ham this
>>>week.
>>> Can anyone tell me at what serial number TT first introduced the
>>> headphones
>>> RFI filter? I installed one in my radio eighteen months or two years
>>> ago.
>>> I do not know the exact age of this radio but want to insure that EI2JD
>>> is
>>> fully sorted. 73 Doug EI2CN
>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec@contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>
> _______________________________________________
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>
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