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Reviews Categories | Power Supplies | Gamma Research HPS-1A Help

Reviews Summary for Gamma Research HPS-1A
Gamma Research HPS-1A Reviews: 39 Average rating: 4.8/5 MSRP: $129.95
Description: The HPS-1a is capable of supplying full power to any 12 volt, 100 watt class transceiver in normal Voice SSB or Morse CW modes. RTTY, AM, and FM modes should be limited to about 35 watts.

Input Voltage = 100-240 VAC, 50-60 Hz, 2 Amps maximum.

Output Voltage = 13.5 VDC
Output Current = 5 Amps Continuous., 22 Amps @ .25 duty/sec.

Dimensions: 3.37" x 1.55" x 5.25"

Weight: 1.25 lbs.
Product is in production.
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AL7GQ Rating: 5/5 Mar 15, 2010 11:27 Send this review to a friend
Great for World Travel  Time owned: more than 12 months
The HPS-1A is the most compact and light AC Power Supply I have ever used. It is well regulated and quiet, considering fan noise and switching noise - there is none! In the past few years I have used it on numerous DX trips. One trip to an island off the coast of Ireland I used it for a month without turning it off with my FT-100D & FT-817. The HPS-1A has made at least a dozen trips to Alaska and worked perfectly on 120VAC power sources, many of poor condition with varying voltage regulation. This power supply has never failed in extreme environments from room temps of 40 degree F to 100+ degree F in high humidity (90%). I would higly recommend the HPS-1A for world travel and extreme environments. This is one small power supply that I have learned to depend on and never plan for a backup.
W4MY Rating: 5/5 Jan 31, 2010 05:58 Send this review to a friend
Great Product, Great Service  Time owned: 0 to 3 months
Ordered product on-line over the weekend. Website easy to use. Credit card was charged immediately via Pay-pal. Received an e-mail from Fred on Monday informing me of a 2-week back order on an important part. He gave me the option to charge back my credit card or wait. I decided to wait. Glad I did! Received the HPS-1A via USPS Priority mail (Fred upgraded this at his expense) on date promised and I used it in time for CQ160 contest. Worked Flawlessly! Fan is silent. Full 100W on CW using my IC-746. When I'm done with my expedition (reason I bought it) I am going to put my Astron VS-35M away.

Its already a 5+ Improvements for the HPS-1B:
1. DC connection via Anderson Powerpole
2. Standard 3-prong AC cord male jack.
3. Move the rocker on-off switch to the front.

$169 is a fair price considering what you get, wish I had bought it when it was $129. You could put it in your back pocket if your pants were loose.

Buy it without hesitation.

FORMER_WF4W_TW Rating: 5/5 May 21, 2009 07:53 Send this review to a friend
This is a fantastic unit!!!  Time owned: 3 to 6 months
If you are really looking for the smallest portable solution and don't need to run anything other than CW/SSB, check out the Gamma Research HPS-1a. It's 3.37" x 1.55" x 5.25" and weighs just 1.25 lbs. It uses around 1 Farad of capacitance that is continuously charged and with CW/SSB the duty-cycle is around 30% so it will run a typical 100 transceiver with no problem on those modes. I've used mine for two portable operations and it has performed great. No noise in the radio(K3) at all. I now use it in the shack as well. It's great to be able to pack the radio and power supply all in one attache case for portable operation! This truly one of those "best thing since sliced-bread" devices!
73, Tad, WF4W
KA6GEM Rating: 5/5 May 13, 2009 12:25 Send this review to a friend
Small, Light-Weight, CLEAN... it's Super!  Time owned: 0 to 3 months
The HPS-1a Gamma Hybrid Communications Power Supply from Gamma Research is a home run, plain and simply: itís the best power supply of its type available and, honestly, thereís not much out there that even comes close.

I purchased a small Yaesu FT-817 a few years ago and love taking it with me on trips but battery life severely limits the amount of time and/or power. And since Iím usually ďon the gridĒ Iíve been looking for a decent but small and light weight power supply to take along. Everything that Iíve found is based on cheap noisy switching circuits which ruin reception on HF or if theyíre RF clean, theyíre way too heavy and bulky. But the HPS-1a takes the cake on all three counts: small, light-weight and clean!

As its website explains, the HPS-1a uses super fast ďUltra- CapacitorsĒ which charge between high current pulse requirements so it can supply 5 amps continuously and up to 22 amps on peaks. I tried it with my 100 watt Yaesu FT-897D on SSB and FM and it handled it A-OK. Itís amazing! Now Iím seriously thinking about buying a Yaesu FT-857D!

The manufacturing build-quality inside and out is superb and Fred at Gamma Research, (K3GQ), has answered all my questions promptly via email. It comes with a Molex power connector (Radio Shack Part Number 274-151), the mate to the terminal on the backside. I chose to make a fused power cord terminating into a pair of Anderson PowerPoles. Because of the way the HPS-1aís capacitors deliver current, Fred recommended a 10 amp fuse. Unlike the PowerPoles, the Molex connector includes a clip that holds the connector firmly in place. One can actually dangle the power supply in the air by with the Molex power cord.

Flipping on the small on/off switch at the back illuminates a small green indicator lamp on the front side. A small whisper-quiet fan keeps the inside cool. Because of the capacitors, the light stays on and the fan continues for a short period after turning it off. For this reason, I find it best to turn off my radio first before shutting down the power supply. Fred says that the HPS-1a can be left on for weeks at a time.

The AC power cord is permanently attached and is about five and a half feet long and terminates into a heavy duty 3 wire grounded plug. Fitted with the right adapter, the HPS-1a can operate overseas where the grid is usually 50 cycles at 220 volts, a very nice feature for the serious traveler.

When in standby, my FT-817 indicates 13.4 volts and it charges the FNB-85 Ni-MH battery nicely so I can leave the bulky Yaesu NC-72B wall charger at home. The added weight of the HPS-1a over the wall wart is only about 3 ounces. And it also does a nice job charging my Yaesu VX-7R handi-talkie!

If youíre looking for an ideal power supply to pack along side your small portable radio, then the HPS-1a is a perfect solution. Itís a solid 5! I strongly recommend it!

Paul, KA6GEM
N2EHG Rating: 5/5 Dec 21, 2008 05:27 Send this review to a friend
great supply long term  Time owned: more than 12 months
I've had my unit for quite some time, after reading such great reviews and really just interested that such a small unit can do the job that the larger ones typically do , i had to try it.

Got it for when i travel and also sometimes set up a rig in say my livingroom and don't want a large clunky supply

The supply has always been great, it's quite both rf wise and to the ear it works like a charm nice to see a new type supply come out and work so well

W9AC Rating: 5/5 Oct 11, 2008 18:44 Send this review to a friend
Excellent Portable Supply  Time owned: 0 to 3 months
I purchased the Gamma supply for use during portable operations with my Elecraft K3 transceiver. Overall build quality is excellent.

I have added a CORCOM IEC filter on the AC line cord in a pigtail configuration. The Gamma supply simply lacks the space necessary to install an IEC receptacle. Also, not knowing whether or not the Gamma is protected against over-voltage, I installed a Littelfuse 1.5KE15A 15-volt transient voltage suppressor reverse-biased across the DC output connector.

The Gamma supply is indeed capable of powering a rig at the 100-watt level, even on CW down to 10 WPM. Below that, the "dah" time on extended characters like "0," become too much for the supply to re-energize its capacitor bank in between transmissions.

I have not tried SSB, but I suspect that the Gamma supply would work equally well. However, since the supply rail voltage changes with duty-cycle, the SSB non-linearities may result when using too much voice processing.

The Gamma supply remains cool to the touch most of the time, but gets slightly warm when running a transmitter at 100W with high duty cycle.
W4KPA Rating: 5/5 Aug 11, 2008 15:31 Send this review to a friend
It's a keeper  Time owned: more than 12 months
I got mine to power a Yaesu FT-817 while I was traveling. It handles that, of course, with one hand tied behind its back. The small size and ability to handle 110 or 220 AC were the main selling points. But, it also will power my IC-706 and my Pro-III on SSB. It's a great addition to the shack.
KC5SEB Rating: 5/5 Aug 1, 2008 20:49 Send this review to a friend
Awesome  Time owned: 3 to 6 months
This is the coolest power supply I have ever seen. I use this with my MARS Jump kit.
It will only handle about 60 watts on MT-63 with the FT-857D but thats about all you need in that mode anyway.
I recommend this to anyone who has to travel light.
We need to get the guy who builds these to start looking at other things to downsize.
K0FTC Rating: 5/5 Apr 4, 2008 01:13 Send this review to a friend
Excellent small/light PS  Time owned: 0 to 3 months
I've had the HPS-1a for about a month now. I use it to power an IC-7000. I operate mostly CW, and it has powered the rig fine from 50 to 100 watts. I've also used it RTTY, PSK, (I reduced power out on these modes) and SSB just fine. It runs with a very quiet fan, and I have not noticed any RF noise in the radio. Very light wt. and it is a very small package and easy to pack. I am considering ordering a second unit to power a K3 that I have on order now.
KT5X Rating: 5/5 Nov 9, 2007 11:40 Send this review to a friend
just too cool  Time owned: 6 to 12 months
Was astonished by the size and weight of this thing. It replaces an Astron 35 amp linear supply. I can not find a switcher noise in my radio, and in addition, for what ever reason, the adjacent computer monitor puts less noise in my radio when using this PS than the Astron.

I did have a problem with it. When charging I got a whine in the headfones. I was tipped off that a few of them got out with the value of 2000 ohms for R25, when it should be 2700 ohms. After making that change, the whine is gone, and the PS is perfect.
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