I use a pulsed two tone generator built from a 1970's QST article. It
generates two tones of about 1800 and 850 Hz. The pulsing comes from an
unfiltered half wave rectification of the AC line.
David
KW4DH
On 9/23/2010 8:39 AM, W5CUL wrote:
> I use a piece of software called Test Tone Generator to pulse tune my amp.
> It is set for 200Hz for one pulse tone, and 600Hz for the other. I have the
> duty cycle for each tone set for 30%, which seems to work very well given I
> operate SSB. It seems to me that it would be a more efficient tune if you
> can mimic the mode of operation you plan on using when tuning your amp.
>
> 73,
>
> Mike
> W5CUL
>
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of David C. Hallam
> Sent: Thursday, September 23, 2010 7:13 AM
> To: Alek Petkovic
> Cc: amps@contesting.com
> Subject: Re: [Amps] Pulse tuning
>
> What about pulse tuning using a two tone signal?
>
> David
> KW4DH
>
> On 9/23/2010 7:58 AM, Alek Petkovic wrote:
>> At 07:22 PM 23/09/2010, Bill, W6WRT wrote:
>>> ORIGINAL MESSAGE:
>>>
>>> On Thu, 23 Sep 2010 03:57:11 -0500, donroden@hiwaay.net wrote:
>>>
>>>> If you have to pulse, you are relying too much on power supply
> capacitors.
>>>> Just build it "large" and don't worry about pulsing.
>>>> Don WA4NPL
>>> REPLY:
>>>
>>> I agree. If you HAVE to pulse to avoid damage, you amp is running on the
>>> edge of self-destruction anyway. Beef it up so it can run full carrier
>>> for at least five minutes at a time with no sweat. Then you can tune it
>>> up the 'right' way.
>>>
>>> Bill, W6WRT
>>
>>
>> Surely, with pulse tuning, you are getting the duty cycle as close as
>> possible to ssb conditions. Therefore you are tuning your amplifier
>> to the absolute optimum level.
>>
>> When you tune with full carrier, power supply sag come into play in a
>> big way and so, once you have tuned your amp under constant carrier
>> conditions, it will be less than optimum for ssb operation.
>>
>> Tell me if I'm barking up the wrong tree but I see pulse tuning as
>> the obvious way to go.
>>
>> 73, Alek.
>> VK6APK
>>
>>
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>> http://www.qrz.com/db/vk6apk
>> http://www.qrz.com/db/vk6ap
>>
>>
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