[TenTec] Argosy Filter

[Dr. Gerald N. Johnson]

Lots of the original 4 crystal filters were replaced by 8 crystal 
filters to have better skirt selectivity and signal rejection out of the 
passband.

73, Jerry, K0CQ

On 8/21/2010 5:44 PM, Rick - NJ0IP / DJ0IP wrote:
> I also have a 4-pole filter labeled 8233.
> I "think" I pulled it from my Argosy 15 years ago and replaced it with an
> 8-pole but can't really remember for sure.
> I too would like to find out what this filter is.
>
>
>
>
> -----Original Message-----
> From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
> On Behalf Of John Graves
> Sent: Saturday, August 21, 2010 5:05 PM
> To: ken.d.brown at hawaiiantel.net; Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] Argosy Filter
>
> Ken;
>
> I believe there are 4 crystals on what appears to be the standard filter
> board.  The 217 is on the AF/IF board and is switch selectable.  This is
> getting the output from the RX mixer which is then fed into the IF/AF
> board and the receive filter if selected. The 8122 filter is also the
> input to the TX mixer.  Interestingly, on the board picture in the
> manual, the filter is numbered as a 8117.  Serial no. is 00042 so things
> change.
>
> John / WA1JG
>
> Ken Brown wrote:
>> Hi John,
>>
>> My best guess is that a leading "4" is missing from that number and the
>> filter is really a 48122. That would fit into Ten-Tec's filter stock
>> number scheme. Based on the other stock numbers beginning with "481" I
>> would guess it is a 9 MHz filter.
>>
>> If you get any more definitive information on that filter, please pass
>> it on to me, so I can improve my filter list. Could you tell me how many
>> crystals are in the filter?
>>
>> Thanks,
>>
>> DE N6KB
>>
>> John Graves wrote:
>>
>>> My Argosy has a 8122 filter on the RF/Mixer board and the expected 217
>>> on the IF/AF board.  What is the 8122 and is that the stock filter?  Is
>>> there a better choice given that I work both SSB and CW with the radio?
>>>
>>>
>> Ten-Tec IF filter data
>>
>> Model Number / Stock Code / Bandwidth Hz / Center frequency MHz / Poles
>>
>> Following the number of poles are other numbers that have been reported
>> seen on these filters. They may be date codes or PCB design numbers.
>>
>> 216 / 48161 /  500 / 9.002210 / 6 RTTY filter
>> 217 / 48036 /  500 / 9.000750 / 8
>> 218 / 48037 / 1800 / 9.001500 / 8
>> 219 / 48055 /  250 / 9.000750 / 6 /8047 / 6840
>> ??? / 48057 /  ??? / ????     / 4 / 84-05
>> 220 / 48058 / 2400 / 9.001500 / 8 /8307 / 6840
>> 221 / 48243 /  250 / 9.000500 / 6 Low note CW filter
>> 282 / 48054 /  250 / 6.299250 / 8
>> 285 / 48053 /  500 / 6.299250 / 8
>> 288 / 48075 / 1800 / 6.300000 / 8 / 9125 / N5
>> unk / 48127 / 6000 / 9 / ?
>> unk / 48074 / 2400 / 6.3 / Stock (non-option) 6.3 MHz filter>
>>
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