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Re: K9HZ PA
开云体育Hi Wade… the Assembly manual covers all of these topics…?? IF you need help with the input attenuator, just ask for the specific example (formulas are in the manual)… ? ? Dr. William J. Schmidt - K9HZ 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 Wayde VA3NCA/AD2GX via groups.io
Sent: Tuesday, February 11, 2025 11:47 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] K9HZ PA ? Hi Dr Schmidt, and everyone here! ? I'm finally getting to start the build of your 20W PA semi-kit. I will eventually use it with my T41 build as I get there, but would like to experiment a little with it as a standalone amp in the meantime. ? Does anyone have a generic block diagram on how this would integrate into an arbitrary other radio? I assume the following needs consideration:? rf-in power matching ( via the input power pad on board)? , rf-out lpf , ptt voltage interface conversion (if necessary), and TR switching? Anything else that would need to be handled? ? If a specific other qrp radio integration has been documented someplace, I'd be interested in reviewing that too! ? Thanks! and 73, Wayde VA3NCA/AD2GX? |
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Re: K9HZ PA
Hi Dr Schmidt, and everyone here!
?
I'm finally getting to start the build of your 20W PA semi-kit. I will eventually use it with my T41 build as I get there, but would like to experiment a little with it as a standalone amp in the meantime.
?
Does anyone have a generic block diagram on how this would integrate into an arbitrary other radio? I assume the following needs consideration:? rf-in power matching ( via the input power pad on board)? , rf-out lpf , ptt voltage interface conversion (if necessary), and TR switching? Anything else that would need to be handled?
?
If a specific other qrp radio integration has been documented someplace, I'd be interested in reviewing that too!
?
Thanks! and 73, Wayde VA3NCA/AD2GX? |
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Re: Easy metal production facilities
开云体育Huh… I’m gonna have to check this out… ? ? Dr. William J. Schmidt - K9HZ 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 Doug W via groups.io
Sent: Tuesday, February 11, 2025 10:48 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Easy metal production facilities ? On Tue, Feb 11, 2025 at 10:24 AM, jerry-KF6VB wrote:
? Actually it doesn't look that bad.? A while ago I cobbled together a slimmed down face plate to fit on a smaller printer bed and just uploaded it to oshcut to see what I'd get.? The powder coat set up fee adds quite a bit if you go that route but if someone really wants it and is willing to put together a group buy, by the time you get to about 10 pieces the powder coat price with setup drops to about the same as the raw or deburred single options. ? ? ? |
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Re: Easy metal production facilities
On Tue, Feb 11, 2025 at 10:24 AM, jerry-KF6VB wrote:
*** My guess is ...if you have to ask... ?
Actually it doesn't look that bad.? A while ago I cobbled together a slimmed down face plate to fit on a smaller printer bed and just uploaded it to oshcut to see what I'd get.? The powder coat set up fee adds quite a bit if you go that route but if someone really wants it and is willing to put together a group buy, by the time you get to about 10 pieces the powder coat price with setup drops to about the same as the raw or deburred single options.
?
?
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Re: Easy metal production facilities
开云体育Figgered that because OSH Park for PCBs is insanely expensive… ? ? Dr. William J. Schmidt - K9HZ 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 jerry-KF6VB
Sent: Tuesday, February 11, 2025 10:24 AM To: [email protected] Cc: K9HZ <bill@...> Subject: Re: [AmateurRadioBuilders] Easy metal production facilities ? On 2025-02-11 08:13, K9HZ wrote:
*** My guess is ...if you have to ask... |
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Easy metal production facilities
开云体育Well… this is interesting:? ? Wonder what is would cost to make a case for the T41 ? ? ? Dr. William J. Schmidt - K9HZ 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@... ? ? |
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Re: Display Board evaluation help
开云体育Perfect Hank, Thanks.? What voltage is your display jumper set to on the Main board? ? ? Dr. William J. Schmidt - K9HZ 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 Hank Terwilliger via groups.io
Sent: Tuesday, February 11, 2025 9:01 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Display Board evaluation help ? Bill, ? I have a working V12 single transceiver.? My initial cable of 12" worked when it was on my bench but when I mounted in the encloser it quit working.? Not sure if that is long enough for a test for you, but when I build a new cable less than 5 inches the display started working. ? I would be happy to test the longer cable out with your board and give feedback.? Could also make a longer cable than required if needed to test.? Let me know. ? 73, ? Hank - WZ3HMT |
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Re: Conductive Paint
开云体育Thanks for summarizing. ? ? Dr. William J. Schmidt - K9HZ 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 chris corcoran via groups.io
Sent: Tuesday, February 11, 2025 8:10 AM To: [email protected] Subject: Re: [AmateurRadioBuilders] Conductive Paint ? Well, that’s 4 hours of my life I won’t get back. ? Rohde & Schwarz hade doing an online seminar ref EMC DEMC 2025 , obviously to sell their equipment, but normally some gems hidden. ? 3 things that come to mind from presentation: ?
I think links top the presentations will be available from the 13th from above url, don’t quote me…
? He referenced an expensive (well to me, ?80ish) ?book Henry Otts Book “Electromagnetic Compatibility Engineering” is a great resource for enclosure design ? BUT, 2009 pdf version can be found ? ? Pages 238 onwards, p270 mentions slot antennas. Also mentions meters/displays on p287, a bit extreme for us amateurs? ? ?
? ? hopefully helpful to someone….. ? ? From: [email protected] <[email protected]> On Behalf Of K9HZ ? I’m sure we should care about the EMI from the display too.??? Tell you what… You work on the EMR and I’ll finish getting the data line noise from propagating back into the radio… ? ? Dr. William J. Schmidt - K9HZ 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@... ? ? |
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Re: Conductive Paint
Good stuff!? Thanks On Tue, Feb 11, 2025 at 9:09?AM chris corcoran via <imnotanumber6=[email protected]> wrote:
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Re: Conductive Paint
开云体育Well, that’s 4 hours of my life I won’t get back. ? Rohde & Schwarz hade doing an online seminar ref EMC DEMC 2025 , obviously to sell their equipment, but normally some gems hidden.
? 3 things that come to mind from presentation: ?
I think links top the presentations will be available from the 13th from above url, don’t quote me…
? He referenced an expensive (well to me, ?80ish) ?book Henry Otts Book “Electromagnetic Compatibility Engineering” is a great resource for enclosure design ? BUT, 2009 pdf version can be found ? ? Pages 238 onwards, p270 mentions slot antennas. Also mentions meters/displays on p287, a bit extreme for us amateurs? ? ?
? ? hopefully helpful to someone….. ? ? From: [email protected] <[email protected]>
On Behalf Of K9HZ
Sent: 08 February 2025 15:46 To: [email protected] Subject: Re: [AmateurRadioBuilders] Conductive Paint ? I’m sure we should care about the EMI from the display too.??? Tell you what… You work on the EMR and I’ll finish getting the data line noise from propagating back into the radio… ? ? Dr. William J. Schmidt - K9HZ 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@... ? ? |
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Re: [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
开云体育Could be that John Melton worked on some of that… ? ? Dr. William J. Schmidt - K9HZ 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 Gary via groups.io
Sent: Monday, February 10, 2025 3:11 PM To: [email protected] Subject: Re: [AmateurRadioBuilders] [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance ? Jerry, The Thetis software for the Hermes Lite, ANAN and radioberry radios has adaptive predistortion and you can examine the source files to see how it works. Thise radios have the capability of operating full duplex so they use the receiver to listen to a sample of the transmitter output and down convert it to baseband where the predistortion is calculated and applied to the baseband transmitter before upconversion. Gary W9TD |
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Re: [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
开云体育The new attenuator/ 20W dummy load I made can be used as just a 40db tap on the RF line for feedback for something like this (besides the radio calibration).? I don’t think it’s that difficult to design a filter that notches out the salient part of the RF spectrum and add the inverse of the garbage back to the signal at the correct amplitude and phase to cancel the garbage out.? I’ve worked on problems like this before… if I get time to do it… I’ll have a look. ? ? Dr. William J. Schmidt - K9HZ 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 jerry-KF6VB
Sent: Monday, February 10, 2025 2:25 PM To: [email protected] Cc: [email protected] Subject: Re: [AmateurRadioBuilders] [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance ? On 2025-02-10 11:34, K9HZ wrote:
*** NO thanks. A 100W transmitter the size of a Heathkit Apache? |
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Re: [SoftwareControlledHamRadio] Rob Sherwood Presentation Slides on Amateur Radio Transceiver Performance
Jerry,
The Thetis software for the Hermes Lite, ANAN and radioberry radios has adaptive predistortion and you can examine the source files to see how it works. Thise radios have the capability of operating full duplex so they use the receiver to listen to a sample of the transmitter output and down convert it to baseband where the predistortion is calculated and applied to the baseband transmitter before upconversion.
Gary
W9TD |
K9HZ
Wayde VA3NCA/AD2GX
Gary