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Author Topic: Power supplies?  (Read 1877 times)
KN4EVS
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Posts: 45




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« on: May 15, 2019, 06:16:01 AM »

Good day my friends,  I’ve become the owner of a Icom IC-7410 and looking for a power supply.
Any suggestions? It requires 13.8 volts 23 amps. Thanks 73’s Paul KN4EVS
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AA4PB
Member

Posts: 15067




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« Reply #1 on: May 15, 2019, 06:28:44 AM »

I've tried others, but I keep coming back to Astron power supplies. I prefer a linear supply for fixed operation where I'm not concerned with size and weight. There's no potential for switching RFI and they are easy to troubleshoot and repair.

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Bob  AA4PB
Garrisonville, VA
N5CM
Member

Posts: 312




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« Reply #2 on: May 15, 2019, 06:40:06 AM »

Astron RS-35M (with meters) or RS-35A (no meters).  Linear power supplies.  Either of these would power your rig with some room to spare.  I have an old RS-35A that I inherited from my dad, and it still works well.
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W9IQ
Member

Posts: 3558




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« Reply #3 on: May 15, 2019, 06:43:09 AM »

I've tried others, but I keep coming back to Astron power supplies. I prefer a linear supply for fixed operation where I'm not concerned with size and weight. There's no potential for switching RFI and they are easy to troubleshoot and repair.



+1

And no annoying fan noise...

- Glenn W9IQ
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- Glenn W9IQ

I never make a mistake. I thought I did once but I was wrong.
K4EMF
Member

Posts: 193




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« Reply #4 on: May 15, 2019, 07:22:05 AM »

You might want to look over the review section
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WA2ONH
Member

Posts: 534




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« Reply #5 on: May 15, 2019, 08:28:42 AM »

Astron RS-35M (with meters) or RS-35A (no meters).  Linear power supplies.

YES! You can't go wrong with this one!

As a FYI on Linear vs Switching Supplies, here's a nice presentation by VA7JW from 9/15/2007 NSARC
North Shore Amateur Radio Club - North Vancouver, B.C. at...

Rig Power Supplies
http://archive.nsarc.ca/hf/psu.pdf

Download a 30-Page Slide PDF Document approx 738 kb in size. My design choice is on Page-30?
« Last Edit: May 15, 2019, 08:34:18 AM by WA2ONH » Logged

73 de WA2ONH  <dit dit> ... Charlie
---------------------------------------------------------------------------------
"Never be satisfied with what you know, only with what more you can find out"
Dr David Fairchild 1869-1954 US Scientist
NO2A
Member

Posts: 1400




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« Reply #6 on: May 15, 2019, 09:52:07 AM »

Astron RS-35M (with meters) or RS-35A (no meters).  Linear power supplies.  Either of these would power your rig with some room to spare.  I have an old RS-35A that I inherited from my dad, and it still works well.
I had the "A" version. In the many years I used it the only thing I've ever had to do was tighten the positive and negative posts internally, as they loosen from use. Absolutely stay with a linear supply.
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K0UA
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Posts: 4832




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« Reply #7 on: May 15, 2019, 10:33:13 AM »

Well Here is a different note for you. I have used an Astron supply for many decades.  Still have it, went thru and modified it for LED meter lighting when the weird incandescent bulbs burned out inside the meters. It is now on the test bench.  I am running both o my7300's off of Tekpower switchers.  no noise that I can find anywhere. Cheap, the fan NEVER has come on in either or if it has it is so quiet I can't hear it.  Each supply would run both rigs, and I have done that, but I decided it would be good to have a spare in service.  I have loathed switching power supplies for decades, but guys some of them can be made quiet. I have one for over a year and the other for 9 or 10 months.  No problems with either.  They stay cool, they don't make any kind of noise and they are small and lightweight.  I can put them and the rigs in a tool case for "show and tell".  I know.. hams don't let hams buy power supplys from Amazon, but I did!.  :0  Tek-Power TPS50SW

https://www.amazon.com/TekPower-TP50SW-Analog-Supply-Cigarette/dp/B00L5QU616/ref=sr_1_fkmrnull_2?crid=1ZP04NFNY222S&keywords=tekpower+tp50sw&qid=1557941354&s=gateway&sprefix=tek+power%2Caps%2C487&sr=8-2-fkmrnull

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73  James K0UA
ARRL Missouri Technical Specialist
N8AUC
Member

Posts: 646




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« Reply #8 on: May 15, 2019, 10:54:13 AM »

Linear supplies are nice. No doubt about that. I've had a few different ones over the years, and they've all been good.
If I had to buy a supply today, I'd probably get an Astron RS-35M. Mainly because I like having the meters.

But I have also had good luck with my Samlex SEC-1223, which is a switching supply.
I've had that one for 10 years now, and never had any problem with it at all.
Best of all, I've not observed any RF noise from it.

The nice thing about a linear power supply, is that you can also use it to float charge an AGM or SLA battery.
Charging a battery directly from a switching supply is not recommended for the Samlex, and the manual that
came with the supply specifically says so.

I picked up a Tripp-Lite PR-10b as part of a trade some years back. It's a 10 Amp linear supply, and I keep it around
mainly for float charging batteries. Although it runs a VHF-FM rig quite nicely, and it will run my FT-857D at 50 watts
output as well. But not both radios together.

Good luck with your new radio! Hope you have lots of fun with it!

73 de N8AUC
Eric
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N6YFM
Member

Posts: 832




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« Reply #9 on: May 15, 2019, 12:33:03 PM »

Astron RS-35M (with meters) or RS-35A (no meters).  Linear power supplies.

YES! You can't go wrong with this one!

Personal opinion:   You can't go wrong *IF* you get the rack mount version,
instead of the desktop version.

I had the desktop version.   I do a lot of RTTY and FT-8.  Those are higher average power
than SSB, for example.    Since the desktop version of the power supply only has room for
one heatsink in the back, it was getting so hot I could burn my hand on it.
[Darwin Tip:  Do NOT stack paper or boxes on top of your astron! ]

Switched to the rackmount version, which has more than enough room for two large heatsinks.
In other words, each heatsink only gets half as hot, if that.    Happy Camper!
I paid less than $30 for a dead rack mount Astron.  Replaced the filter cap and the
723 regulator, for a total of $20 more.   So for less than $50, a great, cool running, large supply.
And for those that don't want to learn how to fix the Astron regulator circuit board, Astron will
send you a new circuit board, fully built and tested, for about $30.
Buy the dead Astrons at the swap meets!  Great deal.

Heat is the stressor and enemy, so I like it running cooler.  Less failures that way.
But both versions of the supply are fine.

Neal
« Last Edit: May 15, 2019, 12:38:24 PM by N6YFM » Logged
N6YFM
Member

Posts: 832




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« Reply #10 on: May 15, 2019, 12:43:25 PM »

Well Here is a different note for you. I have used an Astron supply for many decades.  Still have it, went thru and modified it for LED meter lighting when the weird incandescent bulbs burned out inside the meters. It is now on the test bench.  I am running both o my7300's off of Tekpower switchers.  no noise that I can find anywhere. Cheap, the fan NEVER has come on in either or if it has it is so quiet I can't hear it.  Each supply would run both rigs, and I have done that, but I decided it would be good to have a spare in service.  I have loathed switching power supplies for decades, but guys some of them can be made quiet. I have one for over a year and the other for 9 or 10 months.  No problems with either.  They stay cool, they don't make any kind of noise and they are small and lightweight.  I can put them and the rigs in a tool case for "show and tell".  I know.. hams don't let hams buy power supplys from Amazon, but I did!.  :0  Tek-Power TPS50SW

https://www.amazon.com/TekPower-TP50SW-Analog-Supply-Cigarette/dp/B00L5QU616/ref=sr_1_fkmrnull_2?crid=1ZP04NFNY222S&keywords=tekpower+tp50sw&qid=1557941354&s=gateway&sprefix=tek+power%2Caps%2C487&sr=8-2-fkmrnull


What about the half dozen or so ONE star reviews, especially the one where the supply blew up
the guy's radio?   I guess we get what we pay for.   And if the supply has NO rf noise, then why
does it need a "noise offset potentiometer" on the front panel?

Thanks, I will stick with Astron, both for linear and switchers.

Cheers
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K4JJL
Member

Posts: 1127




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« Reply #11 on: May 15, 2019, 01:37:48 PM »

I used a computer power supply out of an HP server.  Found it in the trash.  Had to solder a couple resistors to make it turn on.  Sounds a bit like a hair dryer when it has a good load on it.  Rated at 75A @ 12VDC.  Weighs maybe 2 lbs and about as small as a brick.
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KN4EVS
Member

Posts: 45




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« Reply #12 on: May 15, 2019, 02:02:06 PM »

Many thanks to all of you that replied. Looks like a new Astron RS-35M-AP is the winner. 73’s Paul KN4EVS
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K5DH
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Posts: 76


WWW

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« Reply #13 on: May 16, 2019, 08:03:33 AM »

I'll throw in another vote for the Astron RS-35M.  I've been using the same one in my shack since I bought it new in 1983.  I had to repair it once, about 25 years ago.  The on/off switch contacts welded themselves in the "on" position.  I installed an aftermarket lighted switch (neon bulb inside) and it's been hummin' along fine ever since.  I've abused that supply quite a bit over the years.  I suspect someone will get it for a great price in my SK estate sale someday. 
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G3RZP
Member

Posts: 1323




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« Reply #14 on: May 16, 2019, 08:20:02 AM »

My admittedly limited experience with switchers is that if something decides for some reason to die, there appears to be a chain reaction trying to kill every semiconductor in the things! But I do NOT like the 723 regulator - they are very prone to misbehaving if RF can get into or even near them.
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