Thanks for the information on Mini Circuits transformer parts. Unfortunately the minimum quantity buy is 20 pieces per each of the two types. Has anyone ordered these quantities with two of each that they can sell to me? Tonight I plan on a close examination and testing of the QSD and QSE transformers that I wound months ago. Thanks for the tip on these being the possible cause of my calibration issue.
Thanks,
Frank K1FFJ
|
Minicircuts ADT2-1T+ is the correct output V11 QSE transformer replacement.?
Minicircuits ADT1-1+ is the correct input V11 QSD transformer if desired.?
Larry
KB3CUF
|
Speaking of transformers, don't make the assumption that the enamel won't break down while winding it. I had that happen recently. I always check for continuity and shorts on transformers and 99.99999% of the time they are fine, but I'm glad I check this one as the enamel abraded off while I was winding it. Pretty sure I would have blown something with a dead short. It only takes a minute to check.
Jack, W8TEE
On Friday, September 29, 2023 at 01:27:01 AM EDT, Larry Acklin <acklin@...> wrote:
Oh yeah, just get the correct one :/
My issue.?
Larry? KB3CUF?
On Fri, Sep 29, 2023 at 1:24 AM K9HZ < bill@...> wrote: That why you should use the Minicircuits drop-in.? it is also very symmetrical so easy to cal too. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? ? The output transformer is critical.? It will affect balance and therefore sideband and carrier suppression.? Do a careful visual inspection.
--
73 Greg KF5N
--
Jack, W8TEE
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
They can¡¯t meet the demand for the Pi-4¡¯s left over from COVID¡ and now have another competing piece of hardware on tap.? Yikes.
They also ran afoul with supply issue due to some of the suppliers objecting to them moving away from being a non-profit foundation and with them moving to make there own silicon and side stepping some of their supplier agreements. ?All of that made it hard to get enough parts to produce the Pi 4s in any kind of quantity, hopefully the 5s won¡¯t have as much of an issue with part suppliers.
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
I have one coming from PiShop as well, but I was sent a priority order code from the Raspberry Pi Press. ? I think if you have the code it ships right away but if not your on the pre-order list and it will ship by oct. 30 IF, they still have any in stock.
|
Oh yeah, just get the correct one :/
My issue.?
Larry? KB3CUF?
On Fri, Sep 29, 2023 at 1:24 AM K9HZ < bill@...> wrote: That why you should use the Minicircuits drop-in.? it is also very symmetrical so easy to cal too. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? ? The output transformer is critical.? It will affect balance and therefore sideband and carrier suppression.? Do a careful visual inspection.
--
73 Greg KF5N
|
That why you should use the Minicircuits drop-in.? it is also very symmetrical so easy to cal too. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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 Greg KF5N Sent: Thursday, September 28, 2023 9:12 PM To: [email protected]Subject: Re: [SoftwareControlledHamRadio] XMIT Calibration ? The output transformer is critical.? It will affect balance and therefore sideband and carrier suppression.? Do a careful visual inspection.
--
73 Greg KF5N
|
Totally. Mine had an open center tap ( wrong part in place) that made a huge difference when I got it working correctly.?
Also to check are the four test points that come from the op amps to the ¡®3253 chip. Tp 3,4,5,6 all should show signal. And very carefully inspect the U3 solder joints as well as the flip flop¡¯s and test points tp7,8 which should have a nice clean square wave at near or on the dial frequency.?
Also run the xmit cal and go up and down, just to verify the thing is really broken. I managed to have a band that showed this symptom until I got phase and gain in the right ballpark.?
Larry KB3CUF
The output transformer is critical.? It will affect balance and therefore sideband and carrier suppression.? Do a careful visual inspection.
--
73 Greg KF5N
|
The output transformer is critical.? It will affect balance and therefore sideband and carrier suppression.? Do a careful visual inspection.
--
73 Greg KF5N
|
Hi all,
Actually a great idea with using earbuds from Larry KB3CUF. Unfortunately the earbud test only confirms that the "L" and "R" channels are working correctly and getting to the QSE board. When removing either "L" or "R" from the Teensy audio adapter one channel on the earbuds disappears. At no time do both "L" and "R" disappear together when the other is still connected. This would eliminate the "L and "R" being shorted as you suggest. It further suggests that neither signal is "missing". I had tested this with an ohmeter and the earbud test just confirnmed that both circuits are working and connected. Any other ideas guys??
Thanks,
Frank K1FFJ
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
The Pishop has them in stock. I have one already on the way.
Jack K3JAS
On Thursday, September 28, 2023 at 01:33:10 PM EDT, Colin Kaminski <colinskaminski@...> wrote:
$60 for 4mb
$80 for 8mb
Sparkfun is taking preorders.?
--
Colin - K6JTH?
|
Re: V012 Proto Board Sets
Ben Cherry- AD8AW
7111 s us31 hwy
Alanson, MI 49706
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
$60 for 4mb
$80 for 8mb
Sparkfun is taking preorders.?
--
Colin - K6JTH?
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
Digikey has over?5000 of the 8GB Model 4B in stock. I think the shortage is finally over. :-) The Model 5 looks slick. Did they announce pricing yet? Mike M.? KU4QO
On Thu, Sep 28, 2023 at 11:40?AM K9HZ < bill@...> wrote: They can¡¯t meet the demand for the Pi-4¡¯s left over from COVID¡ and now have another competing piece of hardware on tap.? Yikes. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C 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@... ? ? ?
Looks like it is time to call it a desktop on a board
- Broadcom BCM2712 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU, with cryptography extensions, 512KB per-core L2 caches and a 2MB shared L3 cache
- VideoCore VII GPU, supporting OpenGL ES 3.1, Vulkan 1.2
- Dual 4Kp60 HDMI? display output with HDR support
- 4Kp60 HEVC decoder
- LPDDR4X-4267 SDRAM (4GB and 8GB SKUs available at launch)
- Dual-band 802.11ac Wi-Fi?
- Bluetooth 5.0 / Bluetooth Low Energy (BLE)
- microSD card slot, with support for high-speed SDR104 mode
- 2 ¡Á USB 3.0 ports, supporting simultaneous 5Gbps operation
- 2 ¡Á USB 2.0 ports
- Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT)
- 2 ¡Á 4-lane MIPI camera/display transceivers
- PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter)
- 5V/5A DC power via USB-C, with Power Delivery support
- Raspberry Pi standard 40-pin header
- Real-time clock (RTC), powered from external battery
- Power button
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
On 2023-09-28 07:10, Doug W wrote:
Looks like it is time to call it a desktop on a board
I was looking at it this morning. Wow. A nearly mainstream-horsepower desktop in that tiny form factor with the same nice experimenter-friendly GPIO header. - Jerry, KF6VB
|
Yea, and a tantalum or electrolytic in backwards- BANG?
Guess who forgot to set the drive trim pot to the minimum resistance before setting the drive current? The corner of the IRF510 produced a spectacular explosion with enough force to nick the ceiling. Moral: Always wear safety glasses when building anything!  -- Jack, W8TEE
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
I don't disagree with your sentiment, but I can say that it will almost certainly be easier for a manufacturer in 2023 to mass produce a brand-new design than to try and continue manufacturing a design that was produced 2-3 years ago (or longer).? Legacy parts are the issue for production presently; if you have a new blank-slate design you can avoid much/all of that, and ensure that your design uses parts being built on fabrication technologies that are not production-constrained (within reason, of course!).? There are many many parts readily available, but if your design uses even a single one that is not (with no drop-in replacement), production is blocked.
I have used every generation of Pi up to this point, either personally or professionally, but I think I'll wait a while to try the 5.? As Jack stated, wait for the dust to settle :)
73,
Josh KB8NYP
|
Re: Raspberry Pi 5 announced - 2.4GHz quad-core 64-bit Arm Cortex-A76 CPU
Things are looking up in this regard with RPi4s slowly making
their way into the USA.? I just purchased a RPi4 4Gb model from an
authorized reseller for an automation project at our church.? Paid
the MSRP price, not an inflated price from a bootleg reseller.
Steve, WB7VHR
On 9/28/2023 11:44 AM, jjpurdum via
groups.io wrote:
toggle quoted message
Show quoted text
Not only that, but this is
the first time they've announced a product that you can't buy.
Some dealers will take preorders, but no one has one yet. It
looks interesting, but they're also bringing out a new OS
(Bookworm) so I'll probably wait for the dust to settle.
Jack, W8TEE
On Thursday, September 28, 2023 at 11:40:45 AM EDT, K9HZ
<bill@...> wrote:
They can¡¯t meet the
demand for the Pi-4¡¯s left over from COVID¡ and
now have another competing piece of hardware on
tap.? Yikes.
?
?
Dr.
William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ
PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ
?
Owner
- Operator
Big
Signal Ranch ¨C K9ZC
Staunton,
Illinois
?
Owner
¨C Operator
Villa
Grand Piton ¨C 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@...
?
?
?
Looks like it is time to call it a desktop on a
board
- Broadcom
BCM2712 2.4GHz quad-core 64-bit Arm Cortex-A76
CPU, with cryptography extensions, 512KB per-core
L2 caches and a 2MB shared L3 cache
- VideoCore
VII GPU, supporting OpenGL ES 3.1, Vulkan 1.2
- Dual
4Kp60 HDMI? display output with HDR support
- 4Kp60
HEVC decoder
- LPDDR4X-4267
SDRAM (4GB and 8GB SKUs available at launch)
- Dual-band
802.11ac Wi-Fi?
- Bluetooth
5.0 / Bluetooth Low Energy (BLE)
- microSD
card slot, with support for high-speed SDR104 mode
- 2 ¡Á
USB 3.0 ports, supporting simultaneous 5Gbps
operation
- 2 ¡Á
USB 2.0 ports
- Gigabit
Ethernet, with PoE+ support (requires separate
PoE+ HAT)
- 2 ¡Á
4-lane MIPI camera/display transceivers
- PCIe
2.0 x1 interface for fast peripherals (requires
separate M.2 HAT or other adapter)
- 5V/5A
DC power via USB-C, with Power Delivery support
- Raspberry
Pi standard 40-pin header
- Real-time
clock (RTC), powered from external battery
- Power
button
--
Jack, W8TEE
|
Guess who forgot to set the drive trim pot to the minimum resistance before setting the drive current? The corner of the IRF510 produced a spectacular explosion with enough force to nick the ceiling. Moral: Always wear safety glasses when building anything!  -- Jack, W8TEE
|
jjpurdum
Mike K
K9HZ
Colin Kaminski