For a 50-watt GMRS or ham mobile used as a base station, buy the BTECH RPS-30PRO: 25 amps continuous at a fixed or adjustable 13.8 volts, with screw, snap-in and socket outputs. For a 100-watt HF rig, or two radios on one supply, step up to the 50-amp BTECH RPS-50PRO. For a CB alone, a 5-amp linear Pyramid PS9KX is all you need.
The trick is the rating. Buy on continuous amps, which is what an FM or digital transmission pulls for as long as you hold the key, not on the surge figure printed big on the front.
Quick picks
| Best overall for 50 W mobiles | BTECH RPS-30PRO | Amazon |
|---|---|---|
| Best-selling 30 A | Jesverty 30 A compact supply | Amazon |
| Best with noise offset | TekPower TP30SWII | Amazon |
| Best for 100 W HF or two radios | BTECH RPS-50PRO | Amazon |
| Best-rated 50 A | Jesverty 50 A supply | Amazon |
| Best linear for 25 W radios | Pyramid PS12KX | Amazon |
| Best for a CB | Pyramid PS9KX | Amazon |
How we picked
We pulled Amazon's results for "ham radio power supply" on Oct 21, 2026, plus the 12-volt supply searches behind our GMRS base station guide, and read each contender's full listing. The Jesverty 30 A compact supply led sales at 100+ bought last month; the Pyle 30 A (1,973 ratings) and Pyramid PS9KX (2,261) had the deepest rating histories. We then sized every pick against current-draw figures from radio makers' own documents: Cobra's 29 LTD Classic manual, BTECH's GMRS-50V2 spec sheet and Icom's published specs for the IC-2730A and IC-7300. Supplies whose listings give only "max" amps got a "check listing" on continuous current, not a guess.
"How we pick" means listings, manuals and spec sheets, not a bench test with a load and a scope. How we research.
Size it from the radio's transmit current
A radio draws a fraction of an amp listening and its full current only while transmitting. The supply has to deliver that full current, steadily, for as long as the transmission lasts. Samlex's ham power supply guide recommends a supply rated at least 25 to 30 percent above the radio's requirement, and the 73QRZ power supply guide gives 20 to 30 percent. We use 25 percent below.
| Radio | Max transmit current (source) | Plus 25% | Supply that fits |
|---|---|---|---|
| Cobra 29 LTD Classic, 4 W CB | 1.5 A (Cobra manual; it asks for a 2 A supply) | 1.9 A | Pyramid PS9KX, 5 A |
| 25 W dual-band or 15-20 W GMRS mobile | About 4-5 A for 25 W (Miklor's buyer's guide); check your manual | About 6 A | Pyramid PS12KX, 10 A linear |
| Icom IC-2730A, 50 W ham mobile | About 13 A (Icom spec) | 16.3 A | Any 25 A-continuous supply |
| BTECH GMRS-50V2, 50 W GMRS mobile | 20 A peak (BTECH spec sheet) | 25 A | BTECH RPS-30PRO (BTECH lists it as the matching supply) |
| Icom IC-7300, 100 W HF | 21 A at 100 W (Icom spec) | 26.3 A | 30 A continuous, or 50 A class with room to grow |
| 50 W GMRS + 50 W ham mobile, one desk | Add both: about 33 A worst case | 41 A | BTECH RPS-50PRO or Jesverty 50 A |
Two practical notes. A CB, GMRS or ham radio only draws what it needs, so a big supply is safe for a small radio; it just costs more. And a bigger supply never adds transmit power to a CB, because 47 CFR 95.967 requires the radio itself to be built so it can't exceed 4 watts on AM or FM and 12 watts PEP on SSB. Part 95 explicitly allows external power supplies on CB radios (95.987(d)(1)); what's banned is an external RF amplifier (95.939).
Continuous vs peak: read the small print
John Miklor's buyer's guide puts it simply: a supply rated 30 amps on surge may only produce about 25 amps continuous, and for FM transceivers you size by the continuous figure. FM sends a full-strength carrier the whole time you're talking, and so do digital modes like FT8. SSB voice is gentler on a supply because the average draw is well below the peak, but the supply still has to hit the peak cleanly.
BTECH is upfront about it: the RPS-30PRO listing says "30A Peak / 25A Continuous." Several 30 A listings on Amazon give only a single "30A max" number, which we've marked "check listing" below.
Linear or switching
| Linear | Switching | |
|---|---|---|
| How it works | Big transformer, then a regulator burns off the excess as heat | Converts at high frequency; small transformer |
| Weight | Heavy: Miklor puts a typical 5 A linear at about 5 lb and a 10 A one at just over 10 lb | Light: a 25-30 A switcher weighs about what a 5 A linear does (Miklor) |
| RF noise | None from switching, because there isn't any | Can add "hash" on HF if poorly filtered; better units add filtering or a noise offset control |
| Heat | Runs warm | Runs cooler |
| Best use | CB and low-current radios; HF listeners who hate noise | Anything over about 10 A: 50 W mobiles, 100 W HF, multi-radio desks |
A noise offset knob, found on the TekPower, Jesverty 50 A and BTECH RPS-50PRO below, shifts the switching noise up or down in frequency so it doesn't land on the one you're listening to. Samlex says it designs its SEC series with filtered output to suppress RFI; the Samlex SEC-1235 is the traditional low-noise choice, though its Amazon listing has only 10 ratings.
The test that matters is your own band. Run the radio from a charged 12-volt battery, note the background noise on the frequencies you use, then switch to the supply. If the noise floor rises or you hear a buzz that moves when you turn the noise offset, the supply is the cause. Ferrite chokes on the DC leads or moving the supply away from the radio often helps.
The 7 best power supplies for ham, GMRS and CB
BTECH RPS-30PRO
The supply BTECH itself lists next to its 50-watt GMRS-50V2, and the one we'd put under any 50-watt GMRS or ham mobile on a desk. The honest 25-amp continuous rating covers a radio that peaks at 20 amps with the margin to spare. Leave the voltage on the fixed 13.8 V setting. The snap-in terminals and screw posts mean you connect the radio's own fused DC cord without cutting it. It has 212 ratings and 50+ bought last month, plus US support from BTECH. Comparing the two BTECH 50-watt mobiles? See GMRS-50V2 vs GMRS-50PRO.
- Output25 A continuous / 30 A peak
- Voltagefixed 13.8 V or 9-15 V adjustable
- Outputs30 A direct terminals, snap-in terminals, 10 A cigarette socket
- Protectionoverheat, short, surge
Why it stands out
- Continuous rating stated plainly
- Fixed 13.8 V setting
- Several ways to connect
Think twice if
- You run 100 W HF plus another radio; get the RPS-50PRO
Jesverty 30 A compact supply
The top seller in our search, at 100+ bought last month with 450 ratings. It's a compact switcher with front-facing screw terminals and the protections you want: over-voltage, over-current and short circuit. The listing doesn't split continuous from peak current, so treat it as a supply for a single 50-watt mobile rather than a 100-watt HF rig until you've confirmed the continuous number.
- Output13.8 V, 30 A (continuous: check listing)
- Size7.48 x 5.9 x 2.36 in, about 3.1 lb
- Terminalsfront screw-type
- Protectionover-voltage, over-current, short circuit
- Coolingfan
Why it stands out
- Compact and light
- Over-voltage protection listed
Think twice if
- You need a stated continuous rating
- You want a noise offset control
TekPower TP30SWII
For an HF operator on a switching supply, the noise offset knob is the feature to look for, and TekPower puts it on a 30 A supply with 539 ratings. If its switching noise lands on a frequency you care about, you turn the knob and move it. The listing gives 30 A as the maximum without a separate continuous figure. TekPower also sells a fixed-voltage version, the TP30SWI (682 ratings), which removes the chance of bumping the voltage dial.
- Output13.8 V, 30 A max
- Voltage9-15 V adjustable
- Noiseoffset control
- Outputsterminals plus cigarette socket
- Warranty1 year, USA
Why it stands out
- Noise offset for HF
- Adjustable or fixed versions
Think twice if
- You need a published continuous rating
BTECH RPS-50PRO
Fifty amps continuous is enough for a 100-watt HF rig plus a 50-watt VHF/UHF or GMRS mobile on the same desk, the case where a 30 A supply runs out of room. The Anderson Powerpole output is rated 45 A, so a Powerpole-equipped radio plugs straight in. The LCD shows volts and amps, which tells you exactly what each radio draws on transmit. Miklor's buyer's guide notes it's his own supply. It has 51 ratings.
- Output50 A continuous
- Voltage13.8 V, adjustable
- OutputsAnderson Powerpole (45 A), back terminal (50 A), cigarette socket (10 A), 2 USB-C
- Noiseoffset control
- DisplayLCD volts and amps
Why it stands out
- 50 A continuous
- Powerpole output
- Live amp reading
Think twice if
- You run one 50 W radio; the RPS-30PRO costs less
Jesverty 50 A supply
Rated 4.8 stars over 339 ratings, the highest score in our search backed by real volume, with analog volt and amp meters you can read across the room. It has a noise offset circuit, automatic current limiting and big screw terminals for heavy leads. The listing says "50 Amp" without separating continuous and peak, so check before you load it with two high-power radios.
- Output13.8 V, 50 A
- Voltage9-15 V adjustable or fixed 13.8 V
- Noiseoffset circuit
- Outputsscrew main terminals, 2 pairs of snap-in terminals, cigarette socket
- Metersanalog volts and amps
Why it stands out
- Twin analog meters
- Noise offset
- Snap-in auxiliary terminals
Think twice if
- You want Powerpole outputs built in
Pyramid PS12KX
A linear supply with real headroom: 10 amps continuous covers a 25-watt dual-band or a 15 to 20-watt GMRS mobile, and there's no switching circuit to put noise on the band. That makes it a good match for a quiet VHF/UHF desk or a shortwave receiver sharing the bench. Expect it to be heavier and warmer than a switcher of the same rating.
- Typelinear, regulated
- Output13.8 V, 10 A continuous, 12 A surge
- Input115 V AC
- Protectionoverload, short circuit, fused with auto reset
- Terminalsscrew-type
Why it stands out
- Linear: no switching noise
- 10 A continuous stated
Think twice if
- Your radio is 50 W or more
Pyramid PS9KX
The supply for a home CB. Cobra's 29 LTD Classic manual asks for at least 2 amps; this gives 5 continuous and 7 surge from a linear design, with 2,261 ratings. It also suits a scanner or a 5-watt GMRS mobile. Our CB base station guide builds a whole home station around it.
- Typelinear, regulated
- Output13.8 V, 5 A continuous, 7 A surge
- Input115 V AC, 70 W
- Protectionoverload, short circuit, fused with auto reset
- Weight4.4 lb
Why it stands out
- Quiet linear design
- Long rating history
- Short-circuit protected
Think twice if
- Anything over about 25 W; it's a 5 A supply
Comparison table
| Supply | Type | Continuous | Peak or max | Noise offset | Good for |
|---|---|---|---|---|---|
| BTECH RPS-30PRO | Switching | 25 A | 30 A | Check listing | One 50 W mobile |
| Jesverty 30 A | Switching | Check listing | 30 A | No | One 50 W mobile |
| TekPower TP30SWII | Switching | Check listing | 30 A | Yes | HF up to 100 W, one radio |
| BTECH RPS-50PRO | Switching | 50 A | Check listing | Yes | 100 W HF plus a second radio |
| Jesverty 50 A | Switching | Check listing | 50 A | Yes | Multi-radio desk |
| Pyramid PS12KX | Linear | 10 A | 12 A | Not needed | 25 W mobile, scanners |
| Pyramid PS9KX | Linear | 5 A | 7 A | Not needed | CB, 5 W GMRS |
Wiring and fusing it safely
The supply's own protection guards the supply. Fuses on the leads guard the wire between the supply and the radio, which is where a pinched or shorted cable starts a fire. Miklor's guide makes the point about exposed-terminal 30 A supplies: "proper fusing must be used."
- Use the radio's own DC cord, with its factory fuses in place, and fuse at the value the radio maker installed. Midland's MXT500 manual tells you to connect the red wire "to the fuse block or positive battery terminal," and Cobra's 29 LTD Classic manual calls for an accessory fuse in a vehicle; at home, the supply end of the cord is where that protection belongs. Never replace a blown fuse with a larger one.
- Don't run a 50-watt radio from the supply's cigarette socket. BTECH rates that socket at 10 A on the RPS-30PRO and RPS-50PRO, well under a 50-watt radio's transmit draw. Use the main terminals or the Powerpole output.
- For more than one radio, use a distribution block and fuse each output. A block like the F-1011 six-position Powerpole block (45 A, 587 ratings) splits one feed into six; its listing doesn't mention fuses, so put an inline fuse on each radio lead.
- Standardize on Anderson Powerpoles. The genuine 30 A Powerpole kit (10 sets with roll pins) is recommended for 12 to 14 gauge wire, which matches most mobile radio cords.
- Keep DC leads short and red-to-red. Reversed polarity is the classic way to blow a radio's fuse, or worse.
- Give the supply air. Switchers have fans; linears dump heat through the case. Don't stack books or a second radio on top.
Leave it at 13.8 volts
Most adjustable supplies here run from about 9 to 15 volts, with a fixed 13.8 V setting. Use the fixed setting. BTECH's GMRS-50V2 spec sheet and Icom's IC-2730A spec both list 13.8 V plus or minus 15 percent, so roughly 11.7 to 15.9 volts. Turning the knob up doesn't add legal power to any radio, and it moves the radio toward the top of its rated range.
One supply for CB, GMRS and ham
A single 30 to 50 A supply with a fused distribution block can run a CB, a GMRS mobile and a ham mobile on the same desk. Size it for the radios that might transmit at the same time. For the GMRS end of that desk, see our GMRS base station guide; for the CB end, CB base station setup covers antennas and the height rule; and our best mobile ham radio picks are the usual ham radios on these supplies. Whichever radio you power, the antenna does more for range than any supply; best ham radio antenna covers that side.
When the power goes out, the supply goes with it. A battery, a charger and a portable kit are the subject of our ham radio go box guide, which works out amp-hours for these same radios.
If you're buying one today
One 50-watt mobile: the BTECH RPS-30PRO. A 100-watt HF rig or two radios: the BTECH RPS-50PRO. A CB: the Pyramid PS9KX. Whatever you buy, put a fuse on every radio lead before you key up the first time.
Sources: Amazon listings and search results (checked Oct 21, 2026); Cobra 29 LTD Classic AM/FM owner's manual (specifications, base station operation); BTECH GMRS-50V2 technical spec sheet; Icom America IC-2730A specifications; Icom IC-7300 specifications; Midland MXT500 owner's manual (support.midlandusa.com); Miklor, "Power Supplies 1.01" buyer's guide; Samlex America, "How to find the best AC-DC power supply for your ham radio setup"; 73QRZ power supplies guide; eCFR 47 CFR Part 95 (up to date as of Oct 19, 2026): 95.967 · 95.939 · 95.987. How we research · Affiliate disclosure