[TenTec] TenTec Paragon II model 586,

[Bob McGraw - K4TAX]

The data I provided is from the Tentec alignment procedure for the two 
radios.

The carrier is not in the middle of the passband of the filter, otherwise if 
so, one would have a DSB signal not a SSB signal  Thus to swap sidebands, 
the BFO frequency must change to the opposite side of the filter and is 
placed down the slope some 3 dB to 6 dB.

Carrier frequency + / - the modulated audio frequency produces two 
sidebands, one of which is eliminated by the filter.

73
Bob, K4TAX



----- Original Message ----- 
From: "Barry N1EU" <barry.n1eu at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, September 30, 2013 11:58 AM
Subject: Re: [TenTec] TenTec Paragon II model 586,


> Maybe my math is wrong, but I figure a passband of 100 Hz to 2900 Hz
> with the 2.8 KHz filter with its center frequency of 9001.5 KHz.
>
> Yes, the carrier suppression/null alignment should be carefully
> performed after installing the new filter, but it's not a difficult
> procedure.  I would follow that with on-air tests to verify inaudible
> carrier levels.
>
> 73, Barry N1EU
>
> On Mon, Sep 30, 2013 at 4:37 PM, Bob McGraw - K4TAX <RMcGraw at blomand.net> 
> wrote:
>> The carrier oscillators are not centered in the filter but  are typically 
>> at
>> the edge or somewhat down the slope of the filter edge.  And usually down
>> the slope some 3 dB to 6 dB with the oscillators being switched in 
>> frequency
>> to the upper edge or lower edge of the filter depending on mode.
>>
>> In the case of the Omni VI Plus the oscillators switch to produce LSB and
>> USB signals with oscillator frequency being 9.000000 MHz for LSB and
>> 9.003000 for USB and CW transmit/Tune being 9.000400 MHz.  Thus the 
>> filters
>> are some 600 Hz down the slope of the filter.
>>
>> With the Paragon the oscillator frequencies are 9.000000 for USB and
>> 9.003000 MHz for LSB and RTTY and 9.000700 MHz for CW/Tune mode.
>>
>> I don't see much if anything to be gained by changing the transmit 
>> bandwidth
>> from 2.4 KHz to 2.8 KHz.  Thus the audio frequency response would be 
>> about
>> 300 Hz to 2700 Hz with the 2.4 KHz filter and 300 Hz to 3100 Hz with the 
>> 2.8
>> KHz filter.
>>
>> Another factor to be considered is the carrier suppression as the carrier 
>> is
>> positioned on the slope of the filter.  If the filter response is not
>> correct, the shape factor not correct and the slope of the filter not
>> correct, be assured that carrier suppression will likely suffer as the
>> filter does contribute to overall carrier suppression.
>>
>> My take on changing filters..........nice science project.
>>
>> 73
>> Bob, K4TAX
>>
>>
>>
>>
>>
>>
>> ----- Original Message ----- From: "Mike Bryce" <prosolar at sssnet.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>> Sent: Monday, September 30, 2013 10:32 AM
>> Subject: Re: [TenTec] TenTec Paragon II model 586,
>>
>>
>>
>>> bill,
>>>
>>> the same filter is used for BOTH transmit and receive.
>>>
>>> I have not put one in, but it's  a simple matter of un-plugging the old
>>> one and pushing the new in its place.
>>>
>>> most of the time that's all you need to do, but sometimes you need to
>>> touch the carrier oscillators to make sure they're are centered in the
>>> filter.
>>>
>>> remember, at 2.8khz, you'll won't be a popular fellow on a crowded band
>>>
>>>
>>> Mike, WB8VGE
>>> SunLight Energy Systems
>>> The Heathkit Shop
>>> http://www.theheathkitshop.com/
>>> J e e p
>>> o|||||||o
>>>
>>> A man with one clock knows what time it is. A man with two clocks is 
>>> never
>>> sure.
>>>
>>>
>>>
>>> On Sep 30, 2013, at 10:12 AM, Basilie Actipis wrote:
>>>
>>>> Has anybody out there have put the inrad 2.8khz SSB filter in their
>>>> paragon
>>>> for TX????????
>>>> Where is the TX SSB filter is located??????
>>>> I know I can use the 6khx AM filter for RX,but I will also install one
>>>> for
>>>> RX.
>>>> Thank you in advance for the help.Bill / N1ASS.73..............
>>>>
>>>> I am re-posting  so others have returned from the TT hamfest can read 
>>>> and
>>>> see if anybody has a answer. Thank you.
>>>> --
>>>> *73........Bill / N1ASS.*
>>>> _______________________________________________
>>>> TenTec mailing list
>>>> TenTec at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>