I received my OII 11/15/06 and the headphone filter was still not installed
at factory - SN 07C10266. But no matter what , I agree with Ron - get the
board - they have designed it so it just a matter of unplugging and
replugging a cable and putting in a couple screws . Each side is an
identical two section cascaded low pass PI network - all surface mount - two
series inductors and 3 shunt capacitors. Inductors are marked 4R7 (DCR 1
ohm) and 471J (DCR 22.9 ohms) - can't tell you what the chip caps are - no
markings.This was a filter board received on 4/7/2007.It completely
eliminated any trace of RF on headphone leads - which was a big problem at a
KW on 10 meters with beam about 45 feet above the Orion.
73 de Hank K7HP
----- Original Message -----
From: "Ron Castro" <ronc@sonic.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, May 01, 2009 5:25 PM
Subject: Re: [TenTec] Orion 2 Headphone RFI Filter
> 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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>
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