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K9HZ amp bias

Larry Acklin All Messages By This Member #6583 I’m toying with an EdenTRX / DSP rig which is capable of AM. If I combine it with a 20W K9HZ (“Bill”) amp, is the building instructions stated bias value correct? It seems to me that AM and SSB are the same with the type of bias adjustment (AB I think) so it would work? ? thanks Larry KB3CUF ?
K9HZ All Messages By This Member #6584 开云体育 Depends on what you are trying to accomplish.? The “cleanest” AM signal is amplified by a class “A” amplifier.? You CAN do that with my amp but limit it to about 7 watts maximum.? Just increase the bias to the point where the amp draws as much current without RF excitation as it does with full excitation.? I can give you the gate voltage to do that on Thursday if you would rather set it that way.? It will work just fine a lower classes in AM though. ? ? 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@... ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Larry Acklin via groups.io Sent: Tuesday, May 27, 2025 1:34 PM To: [email protected] Subject: [AmateurRadioBuilders] K9HZ amp bias ? I’m toying with an EdenTRX / DSP rig which is capable of AM. If I combine it with a 20W K9HZ (“Bill”) amp, is the building instructions stated bias value correct? It seems to me that AM and SSB are the same with the type of bias adjustment (AB I think) so it would work? ? thanks Larry KB3CUF ?
Larry Acklin All Messages By This Member #6585 Just wanted to try AM again after many decades or more (10/11M " skip?")? Apparently 40M has a watering hole at 7.290. Class AB biasing may get the job done? I don't have a big amp for 40M unless I set up a project amp and then the bias question comes up again. The Motorola EB300 amp... I have a Henry Electronics driver amp that can make 200W easy with a sufficient drive.? Larry KB3CUF? toggle quoted message Show quoted text On Tue, May 27, 2025 at 11:25?PM K9HZ via <bill=[email protected]> wrote: Depends on what you are trying to accomplish.? The “cleanest” AM signal is amplified by a class “A” amplifier.? You CAN do that with my amp but limit it to about 7 watts maximum.? Just increase the bias to the point where the amp draws as much current without RF excitation as it does with full excitation.? I can give you the gate voltage to do that on Thursday if you would rather set it that way.? It will work just fine a lower classes in AM though. ? ? 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 Larry Acklin via Sent: Tuesday, May 27, 2025 1:34 PM To: [email protected] Subject: [AmateurRadioBuilders] K9HZ amp bias ? I’m toying with an EdenTRX / DSP rig which is capable of AM. If I combine it with a 20W K9HZ (“Bill”) amp, is the building instructions stated bias value correct? It seems to me that AM and SSB are the same with the type of bias adjustment (AB I think) so it would work? ? thanks Larry KB3CUF ?

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