How does this look?
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Builders,?
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I have just completed the 20W board and it is putting out a healthy 20 watts.
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I am using a Hermes lite to drive it.??
When I put a CW signal through it, with no Low Pass filter, my waveform looks like this.
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Does this look like a reasonable before Low Pass filtering?
Thanks for your input.
David
W0NP
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开云体育What does it look like before it goes into the 20W PA? ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of David Dill via groups.io
Sent: Saturday, May 31, 2025 11:21 AM To: [email protected] Subject: [AmateurRadioBuilders] How does this look? ? Builders,? ? I have just completed the 20W board and it is putting out a healthy 20 watts. ? I am using a Hermes lite to drive it.?? When I put a CW signal through it, with no Low Pass filter, my waveform looks like this. ? Does this look like a reasonable before Low Pass filtering? Thanks for your input. David W0NP ? ? |
开云体育Ah yes, you are over-driving the 20W PA…? you need a larger PAD. ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of David Dill via groups.io
Sent: Saturday, May 31, 2025 12:33 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] How does this look? ? attached |
开云体育But look at how resilient the PA is… when you over-drive it… its doesn’t blow up… it just goes into compression and “flat tops” like you would want it to… like an audio amp when you are over driving the input… ? The assembly manual has instructions for adjusting the PAD to meet your needs. ? ? Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois ? Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of David Dill via groups.io
Sent: Saturday, May 31, 2025 1:41 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] How does this look? ? Got it. Distortion. Thanks Bill ?
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K9HZ
