Re: T41 Books for sale - signed copies Latest version
On 2025-05-20 23:09, K9HZ wrote: I just shipped a small UPS box to the UK and it was $58. *** Was that through Pirate Ship? - Jerry, KF6VB
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Re: T41 Books for sale - All gone!
I am down to just one book, so I will probably cut off the offer at this time.
Sorry anyone missed out. Thanks very much to those who replied.
Regards,
Al
AC8GY
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Re: T41 Books for sale - signed copies Latest version
Keith,
It looks like about $60 for shipping alone. I only have one left. It does not seem like our signatures are worth $60.
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How about if I scan one of the signature pages and personalize it to you n send it attachment. Then you could add it to the book w/o having to spend over 100$
Al
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Re: Help: Audio is pumping on bands 17 and 15.
Thanks Oliver.
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My rig does have the ATTiny in place and it is programmed.
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Re: Help: Audio is pumping on bands 17 and 15.
The main board (optionally) uses an ATTiny85 to control the power rail. When you press the power on/off push button on the front panel the Teensy code executes a function (ShutdownTeensy) in which you can perform any shutdown operations you'd like before commanding the ATTiny85 to cut the power to the radio. For reasons I haven't prioritized figuring out yet, the audio processing chain exhibits a chopping or pulsing artifact after the button is pressed. It can probably be fixed by clearing the audio buffers after the shutdown command is sent. I'll test that out next time I'm in the lab.
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I'm guessing that for your radio the BEGIN_TEENSY_SHUTDOWN pin (physical pin 2, GPIO 0) is floating because you have not populated the ATTiny85, and this floating pin is interpreted as a HIGH at some point, triggering the audio artifact.
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Re: Help: Audio is pumping on bands 17 and 15.
Oliver, yes it does!
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Howcome?
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BTW there is still a loud "pop" when the rig is turned on. This has been there all along but was a minor issue.
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Roger G8JWT
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Re: T41 Books for sale - signed copies Latest version
I just shipped a small UPS box to the UK and it was $58. ?And that is the cheapest price (would not be less at zero weight). USPS wont even deliver a package to the UK anymore.?
Dr.?William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton - J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com
email:??bill@... ?
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On May 20, 2025, at 7:13?PM, G0GNL via groups.io <hammy.groups@...> wrote:
? Hi Al your post said " Outside the US, international shipping applies," which suggests you'd be willing to try international shipping.
So any idea what it would cost to send to England/Great britain/United Kingdom?
If it's not too prohibitive can you accept anything other than a paper cheque (check!). I'd prefer an electronic payment, either a direct bank transfer or Paypal. Both of these will cover the currency conversion charges and I'll happily add on the Paypal commision so you're not out-of-pocket.
Regards and thanks for the interesting project
Keith, G0GNL
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Re: JLCPCB Price Increase
On 2025-05-20 18:40, glenn via groups.io wrote: Shipping $1.50 global standard direct *** Sigh. That's what it cost here in the good old days... - Jerry, KF6VB
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Re: JLCPCB Price Increase
I just ordered a PCB from JLC.
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Cost was US$2?? plus they charge GST 10% (sales tax in VK)
Shipping $1.50? global standard direct
or DHL $18.00
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Glenn
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Re: T41 Books for sale - signed copies Latest version
Hi Al your post said " Outside the US, international shipping applies," which suggests you'd be willing to try international shipping.
So any idea what it would cost to send to England/Great britain/United Kingdom?
If it's not too prohibitive can you accept anything other than a paper cheque (check!). I'd prefer an electronic payment, either a direct bank transfer or Paypal. Both of these will cover the currency conversion charges and I'll happily add on the Paypal commision so you're not out-of-pocket.
Regards and thanks for the interesting project
Keith, G0GNL
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Re: Help: Audio is pumping on bands 17 and 15.
Yeah, that's probably an unnecessarily long wait. The ATTiny85 code has a couple of delays that result in the long wait. It can easily be shortened by changing these two lines:
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On Tuesday, May 20th, 2025 at 6:24 PM, jerry-KF6VB <jerry@...> wrote:
On 2025-05-20 13:09, Oliver KI3P via groups.io wrote:
Do you know what else that sounds like? The audio artifact you get
after you press the On/Off button and are waiting for the ATTiny to
turn the power off. *** That has always mystified me. The way it's supposed to work is:
You press the power button. The AtTiny tells the Teensy - "It's time to
shut down".
The Teensy quickly cleans up and tells the atTiny - "OK to shut down
now", and the
atTiny turns off the juice.
So the Teensy doesn't "wait" for the atTiny - it's the atTiny waiting
for the Teensy.
It should reasonably happen in one swing of the main loop.
- Jerry, KF6VB
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Re: Help: Audio is pumping on bands 17 and 15.
On 2025-05-20 13:09, Oliver KI3P via groups.io wrote: Do you know what else that sounds like? The audio artifact you get
after you press the On/Off button and are waiting for the ATTiny to
turn the power off.
*** That has always mystified me. The way it's *supposed* to work is: You press the power button. The AtTiny tells the Teensy - "It's time to shut down". The Teensy quickly cleans up and tells the atTiny - "OK to shut down now", and the atTiny turns off the juice. So the Teensy doesn't "wait" for the atTiny - it's the atTiny waiting for the Teensy. It should reasonably happen in one swing of the main loop. - Jerry, KF6VB
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Re: Help: Audio is pumping on bands 17 and 15.
I¡¯ll check that out tomorrow and get back to you. Without a carrier tuned in the background noise pulses in a similar way. It¡¯s more pronounced on 17m than 15m.
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Re: Help: Audio is pumping on bands 17 and 15.
Do you know what else that sounds like? The audio artifact you get after you press the On/Off button and are waiting for the ATTiny to turn the power off.
Does this sound go away if you comment out the following line in Config.h (line 17)? #define MAIN_BOARD_ATTINY_SHUTDOWN
On Tuesday, May 20th, 2025 at 12:51 PM, bty84827531 via groups.io <roger.trett@...> wrote:
Oliver, here's a recording of my T41 on 17m being driven by a carrier from a signal generator.
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Roger G8JWT
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Re: Help: Audio is pumping on bands 17 and 15.
That almost sounds like the keyer is on.
Jack, W8TEE
On Tuesday, May 20, 2025 at 12:51:10 PM EDT, bty84827531 via groups.io <roger.trett@...> wrote:
Oliver, here's a recording of my T41 on 17m being driven by a carrier from a signal generator.
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Roger G8JWT
-- Jack, W8TEE
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Re: Help: Audio is pumping on bands 17 and 15.
Oliver, here's a recording of my T41 on 17m being driven by a carrier from a signal generator.
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Roger G8JWT
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The BOM for the LPF Filter board lists all of the caps as 200V
but the schematic shows 100V. The 200V and higher caps are almost
non existent on Mouser or DigiKey and the few values there are
$1.00+ each. Are 100V parts acceptable for 100W?
--
73
Bob W3RDL
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T41 Hilbert Filter Design
Al
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I noticed that the Hilbert filter coefficients in v66-9 don't exhibit the same structure as in v50 where the negative 45 phase shift coefficients are just the reverse order of the positive 45 phase shift coefficients.? Can you provide the Hilbert filter design files for v66-9 and v50.??
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Thanks Terrance
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Re: Help: Audio is pumping on bands 17 and 15.
V12? I'd check U8 on the LPF control card. It got fried on mine,
and it caused transmit oscillation on the higher bands.
- Jerry, KF6VB
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Re: Radiated EMI from displays
John,
We are developing a new website highlighting te T41. We would like to include some user implementations, including yours. If that is OK, please send me a photo and brief writeup about your implementation by private post.
Thanks,
Al
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K9HZ
jjpurdum