ok, jack
----- Original Message -----
From: "Ron Castro" <ronc@sonic.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Wednesday, February 04, 2009 10:25 AM
Subject: Re: [TenTec] Orion at QRP levels
> Jack: The Power control on the Orion is actually an ALC threshold
> control,
> so as you drop the ALC threshold to hold the power to a lower level, you
> should also drop the audio drive level. 5 Watts is 13 dB below 100, so I
> would drop the audio down by that amount. An easier way is to decrease
> the
> level as far as you can while still having the ALC light flash.
>
> That may not be the ultimate reason you got a report of splatter. Solid
> state RF amplifiers are designed to have best efficiency and lowest IMD at
> their design power level. Deviating significantly from that power level
> can
> increase IMD. The best test is to look at the signal on a spectrum
> analyzer
> using a two-tone test. I have done this on the Orion II in the 40-100
> Watt
> range (looks very clean), but never at QRP. Next time I get a chance,
> I'll
> try that and see what it looks like.
>
> Ron N6IE
> www.N6IE.com
>
> ----- Original Message -----
> From: "jack" <jfriend31@comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Tuesday, February 03, 2009 7:24 PM
> Subject: Re: [TenTec] Orion at QRP levels
>
>
>>i have had good reports on CW using the Orion turned down to 5 watts or
>> less. no indication of any negative sort in that mode.
>> jack ak7o
>>
>> ----- Original Message -----
>> From: "Ralph Matheny" <mathenyr@marietta.edu>
>> To: <tentec@contesting.com>
>> Sent: Tuesday, February 03, 2009 7:06 PM
>> Subject: [TenTec] Orion at QRP levels
>>
>>
>>> This past weekend I wanted to make a few Q's in the QRP SSB contest, so
>>> I cranked down the Orion to 5 Watts and called away. In a few minutes,
>>> I received what I believe was an accurate report that the signal was
>>> broad and producing "splatter". After giving some thought, it seems
>>> obvious that resetting the mike gain, speech proc, etc. are probably
>>> needed in order to use the Orion at low power levels. I also suspect
>>> that
>>> the 100-watt amp could be both a good 100-watter and a 5-watter without
>>> bias adjustment, at least for SSB.
>>>
>>> Does anybody else use the Orion at QRP?? Problems or results?
>>>
>>> Ralph Matheny
>>> K8RYU
>>> 207 Gibbons Place
>>> Marietta Ohio 45750
>>> mathenyr@marietta.edu
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> 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
>>
>
> _______________________________________________
> 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
|