Re: Regulator - 12vdc to 5vdc for Raspberry Pi
Hi Frank,
I've found that the "CPT" power supplies are not all created equal. It
would seem the manufacturers figure since it's hidden in potted epoxy, no
one can see what was actually used!!!
Early "CPT" power supplies that I purchased worked GREAT! And, I
recommended them for HamVoIP RPi2/3 users (this pre-dated the RPi4). Then,
I got some more batches of these supplies that they were junk--they ALL
failed, in time. Grrrr.
I dug one of these older "CPT" units open one afternoon, and found this
exact board hidden inside:
Here is the converter chip datasheet:
Anyhow, my reasoning for avoiding the "CPT" modules is that you can't tell
what you're actually getting, which is disappointing, because the potted
converter modules have a very nice form factor.
73, David KB4FXC
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On Mon, 4 Jan 2021, Frank Perkins wrote: Hi Kevin,
On the one David suggested (board only), one of the views describes a
heatsink should be installed on the chip (see pic) if the intended load
would exceed 2.5 amps.
Since all the info dynamics of these rascals are the same, I'll bet they
incorporate that same board, but the "failing" units didn't have the
heatsink.
Just a thought.
Frank N6CES
On Mon, Jan 4, 2021, 5:13 PM Kevin Custer <kuggie@...> wrote:
I've had LOTS of failures with these "CPT" units. They are packaged very
nicely, but we've seen lots of issues / failures.
The ones David mentioned are way better IMHO:
Kevin W3KKC
On 1/4/2021 5:06 PM, dshack@... wrote:
DC-DC 12V to 5V Mini/Micro/A type Single USB Converter Step Down Power
Module | eBay
<>
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
Hi Kevin, On the one David suggested (board only), one of the views describes a heatsink should be installed on the chip (see pic) if the intended load would exceed 2.5 amps. Since all the info dynamics of these rascals are the same, I'll bet they incorporate that same board, but the "failing" units didn't have the heatsink. Just a thought. Frank N6CES
On Mon, Jan 4, 2021, 5:13 PM Kevin Custer < kuggie@...> wrote:
?I've had LOTS of failures with these
"CPT" units.? They are packaged very nicely, but we've seen lots
of issues / failures.
The ones David mentioned are way better IMHO:
Kevin W3KKC
On 1/4/2021 5:06 PM, dshack@... wrote:
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Trygon M5C36 power supply tech data
Hi
I am in need for technical data, schematic or manual for a Trygon M5C36-15 power supply manual
It is a older 36 Volt 15 Amp power supply.
The one I have failed with full current shown on the meter with 0 volts with overvoltage disconnected.
?
With no external connections.
Any help appreciated.
Byron
NJ7J
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
The best 5V power supply I've ever found for a Pi is a lighter plug USB adapter from Amazon, the "Amazon Basics" model. Take it apart and discard the shell, solder power in and a compatible USB cable out onto the PCB, and suspend it in a discarded prescription drug bottle.? https://cloud.hamoperator.org/s/CWobsjmXnTHfjRk
3 Amps at 5.2V, and more reliable than the CPT things which I've stopped purchasing.
Danny
From: "jeremy_georges via groups.io" <jeremy_georges@...>
To: "repeater-builder" <[email protected]>
Sent: Monday, January 4, 2021 3:20:30 PM
Subject: [repeater-builder] Regulator - 12vdc to 5vdc for Raspberry Pi
Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
I'd be careful about the "CPT" modules.? In the description it says "Nominal current rating:? 12A", but on the case of the unit it says "5V 3A".
-ed, k9ew
On Monday, January 4, 2021, 4:36:20 p.m. EST, David McGough < kb4fxc@...> wrote:
I've got dozens of these DC-DC converters in use. They easily power every
system I've tried, up through an RPi4B w/4GB RAM and one USB3-SATA
attached SSD drive.
I purchase 10 at the time.
73, David KB4FXC
On Mon, 4 Jan 2021, jeremy_georges via wrote:
> Folks,
>
> Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
>
> There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
>
> Thanks
> -J
>
>
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
?I've had LOTS of failures with these
"CPT" units.? They are packaged very nicely, but we've seen lots
of issues / failures.
The ones David mentioned are way better IMHO:
Kevin W3KKC
On 1/4/2021 5:06 PM, dshack@... wrote:
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
This is what I use:
Might be a bit more expensive than ebay but sourced from a us company and comes prewired with power poles. Plug and go.?
Eric Af6ep?
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On Jan 4, 2021, at 1:20 PM, jeremy_georges via groups.io <jeremy_georges@...> wrote:
?Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
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Re: Anybody have schematics or notes on MTR2000 power supply fixes?
My MTR 2000 UHF, the power supply gets really, really hot, around 110 degrees! Any idea what would cause that?????????
On Mon, Jan 4, 2021 at 7:23 AM Paul Metzger - K6EH < paulmetzger@...> wrote:
The most common failure to these supplies was simply two fuses and two varistors (the two blue discs right near the two fuses).
It's pretty much a MUST to have some sort of AC surge protecting device on an MTR2000. Outside of that, they are work horses.
Sorry, don't have a schematic for you.
k6EH
-- Glenn (Butch) Kanvick KE7FEL/R 1-406-655-1232 ?
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
On Monday, January 4, 2021, 4:36:20 p.m. EST, David McGough <kb4fxc@...> wrote:
I've got dozens of these DC-DC converters in use. They easily power every
system I've tried, up through an RPi4B w/4GB RAM and one USB3-SATA
attached SSD drive.
I purchase 10 at the time.
73, David KB4FXC
On Mon, 4 Jan 2021, jeremy_georges via groups.io wrote:
> Folks,
>
> Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
>
> There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
>
> Thanks
> -J
>
>
|
On 1/4/2021 12:09 PM, Teton Amateur Radio Repeater Association (TARRA) wrote: You are close. There is a DTMF command that will activate the RS-232 connection: Good point, I missed this. The other thing I am curious about, once the controller programmed, is there that much that you really need to keep doing a full programming for??? You can make changes by DTMF commands. Once you have computer access to the CAT1000 you can download the 8 files that contain all the programmed information. You can then run a DOS program called CAT.EXE to display all of the settings. There is an option in CAT.EXE to print out a nice document that shows all the programming information. The problem is that it wants to direct the document to the LPT port. Most people no longer have a printer that connects to an LPT port, so you need to run a DOS program that directs the printout from the LPT port to a text file. 73, Joe, K1ike
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Re: Regulator - 12vdc to 5vdc for Raspberry Pi
I've got dozens of these DC-DC converters in use. They easily power every
system I've tried, up through an RPi4B w/4GB RAM and one USB3-SATA
attached SSD drive.
I purchase 10 at the time.
73, David KB4FXC
toggle quoted message
Show quoted text
On Mon, 4 Jan 2021, jeremy_georges via groups.io wrote: Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
|
Re: Regulator - 12vdc to 5vdc for Raspberry Pi
I'm using this one in my 24/7 Winlink gateway, and it's been doing fine for a couple of months now.? I gave it a weeklong full load (4A) bench test before putting it online.
ed, k9ew
On Mon, Jan 4, 2021 at 3:20 PM jeremy_georges via <jeremy_georges= [email protected]> wrote: Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
|
Re: Regulator - 12vdc to 5vdc for Raspberry Pi
Look on the hamvoip forum on groups io. There are some recommended there.?
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On Jan 4, 2021, at 3:20 PM, jeremy_georges via groups.io <jeremy_georges@...> wrote:
?Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
|
Regulator - 12vdc to 5vdc for Raspberry Pi
Folks,
Any luck on a specific regulator to power a Raspberry PI for an Allstar, Echolink, etc controller? Ideally something with minimal RF noise since these are all switchers/buck type regulators. I could build something...but at this point I would just rather buy an off the shelf product with the integrated micro-USB adapter already in place.
There are some listed on Amazon with mixed reviews. But thought I'd ask the group to see if you've had any real world experience with any of these.
Thanks
-J
|
When you add personalities, don't forget the bottom Zone/Channel Assignment item of the dropdown tree. Therein, you must define at least one zone and add its channel members. You'll see a list with only one entry at present. Right click and use "Add to End" for each channel to be added. Then at the right column, select the Personality # matching the desired channel for each row. Save and program.
73, Matt W6XC
On Mon, Jan 4, 2021 at 12:11 PM KA0TAO Larry via <lrochs2013= [email protected]> wrote: When programming the cdm1250, I can not get it to recognize the channels, it stays on the first one. I am sure I am missing a little step. it keeps showing zone 1. However the read out says GRMS. Thanks for the help. Larry KA0TAO
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When programming the cdm1250, I can not get it to recognize the channels, it stays on the first one. I am sure I am missing a little step. it keeps showing zone 1. However the read out says GRMS. Thanks for the help. Larry KA0TAO
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There is a flavor of DMR trunking that has a control channel - Motorola Connect Plus which uses a 3600 control channel that sounds very similar to a legacy SmartNet or SmartZone 3600 control channel when you listen to it on an analog receiver. ? Capacity Plus DMR trunking is more like LTR.? You can link Capacity Plus sites together to form a wide area system.? Then it becomes Capacity Plus Linked. ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Dan Woodie
Sent: Friday, January 01, 2021 18:32
To: [email protected]
Subject: Re: [repeater-builder] Trunking ? Aside from DMR and LTR trunking you also have one transmit frequency that is always tied up with control channel
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Re: Anybody have schematics or notes on MTR2000 power supply fixes?
Those foreign power supplies are a nightmare, and hardly worth it unless it¡¯s only a fuse or something simple. You can always run it on 24-28vdc and it¡¯ll probably last longer. I¡¯ve put a number of them on the Meanwell DIN rail DC PSupplies after the AC power supply fails and they¡¯ve been working for years now. Just FYI. Good Luck. VR
Rick Kk4b ? ? ? ? ?
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From: [email protected] < [email protected]> On Behalf Of Paul Metzger - K6EH Sent: Monday, January 04, 2021 9:23 AM To: [email protected]Subject: Re: [repeater-builder] Anybody have schematics or notes on MTR2000 power supply fixes? ? The most common failure to these supplies was simply two fuses and two varistors (the two blue discs right near the two fuses). It's pretty much a MUST to have some sort of AC surge protecting device on an MTR2000. Outside of that, they are work horses. Sorry, don't have a schematic for you.
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You are close. There is a DTMF command that will activate the RS-232 connection:
"Remote Activation Of The RS-232 Port
To activate the RS-232 port, key-up and enter the control operator prefix code
followed by [97].? Un-key and the CAT-1000B will automatically switch to the computer
terminal programming mode.? This RS-232 port is configured for a baud rate of 4800."
What I'm not sure about is if sending it again will take it out of programming mode or if it will time out and come out on it's own.
The other thing I am curious about, once the controller programmed, is there that much that you really need to keep doing a full programming for??? You can make changes by DTMF commands.
Mick - W7CAT
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----- Original Message ----- From: Joe To: [email protected]Sent: Monday, January 04, 2021 07:59:42 AM Subject: Re: [repeater-builder] CAT1000 comms This may not work on the CAT1000. I believe that you need to turn the
CT1000 off, operate DIP switch 8, then turn the CAT1000 back on the
activate the RS232 connection.
Joe
On 1/4/2021 6:10 AM, SRG wrote:
Have you tried doing a packet RF link to the controller? Just a thought if the site is far away.
--
Regards, Karl Shoemaker
-- Untitled Document
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On 12/31/2020 1:28 AM, Dan Woodie wrote: Unfortunately until the FCC changes the rules and eliminates the
requirements that hams both positively control their transmit
frequency and monitor before transmitting Trunking is not a legal
option for ham radio in the US.? These days so many repeaters
(including my own) sit idle much of the time so there is no real need. So all the D-STAR, DMR, PL decode FM, and similar have mic hook switches to monitor the frequency before transmit??? (I think not). Just as an example: DMR transmits to get an admit tone long before an FCC ID is sent. Likewise, an FM, P.25, whatever signal would not be decoded. Unless you happen to notice *and trust* the S-meter, you have no indication the frequency is in usage. Reality is that while you might be right in the most rigorous interpretation of the regs, the FCC get's a bit impatient with this type of gnat's hair splitting. We are our own worst enemy. (Which I have heard from both FCC and NTIA officials over the years). HF Ex: NTIA guy told us in a sidebar at a conference that the craziness regarding 60m regs was not them, it was ARRL and other ham orgs. As long as we have a clean signal inside the SSB bandwidth, they don't care. Likewise said they would happily allocate more 60m freqs, but no one is asking. Have fun, Alan KM4BA
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Danny K5CG
Kevin Custer
Glenn (Butch) Kanvick
Matt Lechliter
Alan KM4BA