So much conflicting information out there.
I recently watched a youtube video from Ten Tec where they show how to tune up their amp using cw dits (like a pecker).http://www.youtube.com/watch?v=6sV_4e7AEBM&feature=player_embedded#
What seems telling to me is at the end, to get it right, he uses full key down because using dits had the grid current too high.
So, if I'm seeing this right, pulsing seems helpful initially to get it close so that your not full key down on some really out of tune settings?
Here is the problem.........no one can be sure how close it gets things. :-)
The goal in tuning is to establish the correct operating load impedance seen by the PA device. The optimum load impedance value decreases as drive and output power levels increase. This means we need to always do the final tuning step at full drive power if we have a fixed supply voltage. We CAN tune at lower voltage at full drive power, if the system allows it, because a linear stage should increase current and voltage in about the same proportion.
One almost daily problem with customers is tuning at low power, and then changing something to cause more power to appear. Like tuning on AM at 25 watts driver carrier and then talking on AM, or tuning at 50 watts and then going to 100 watts PEP drive. Since many or most radios have loop delay in the power control systems, there is often some leading edge overshoot at the start of transmissions.
An audio pulsed tone solves absolutely nothing that cannot also be solved with dots because, within frequency response of modulation systems, the RF product is identical. The simple goal is to have peaks at maximum power, and have meters respond in a useful way.
Since a grid meter is the single most useful meter indicator of proper operation, we really should check the grid meter as a final tuning step with full drive power.
After that though, you should know where your amp is close so... Since it is the peaks that matter just use a straight cw tone?
CW PEP= CW average for steady carrier
So a CW carrier is also PEP at the same level. :-) The only thing the dots or pulsed audio does in reduce duty cycle and heat.
I can't tell you how many times I've read that if you don't use a pecker or some other type of pulsed tuning to tune your amp for SSB that your underloaded.
I wonder why people say that? I suppose people who have a tough time managing tuning and melt tubes down could use a pulser, but that is a heat problem. IMO using a pulser either keeps things the same or increases the chances of mistuning. I can't see why it would make things better.
Maybe someone can explain why it would make things better.