trek powerfly fs 4 625 test

2023 Trek Powerfly FS 4 Review

Are you planning to buy an electric mountain bike? Do you have plans to hit the trails and mountains with a reliable power-assisted model?

The Trek Powerfly FS 4 is one of the most popular electric bikes on the market. With its motorized assistance, mid-drive design, and trail-ready components, it could be the perfect bike for your next ride.

Since its launch, Trek’s Powerfly FS 4 has become a fan favorite among mountain bikers. Its blend of power and agility make it an ideal choice for cyclists looking for serious performance on their rides.

The Powerfly FS 4 is designed to offer unparalleled experiences both off-road and on urban streets.

In this review, we look at the features that make this e-bike one of the best in its class and also elaborate on what it brings to the table in terms of value for money.

2023, Trek’s model year for all mountain e-bikes is here and the Powerfly FS 4 is their latest offering.

It’s a bike that caters to riders looking for a full suspension electric mountain bike with enough torque to take on anything you throw at it.

The Powerfly FS 4 also has several features that are sure to appeal to more serious cyclists, such as an optimized magnesium rocker link, adjustable assist levels, rack and fender mounts, and much more.

This review will go over the features of the 2023 Trek Powerfly FS 4 and provide an overview of its performance.

Take your off-road adventures to the next level with the 2023 Trek Powerfly FS 4, a performance mountain bike equipped with the latest technology to optimize your trails.

Featuring a Shimano 10-speed drivetrain and one of a kind eMTB motor system, this electric bike allows you to push beyond your typical limits and explore places that would normally be inaccessible.

With an upgraded suspension system, increased range, and safety features such as room for integrated lights and an updated dropper post design, you will experience no limit rides.

– Shimano Deore 1×10 speed drivetrain shifts quickly and smoothly.

– Motor system provides automatic support during off-road ascents.

– 120mm SR Suntour XCR 34, air spring suspension front fork improves agility on trails.

– TranzX dropper post design for quick seat adjustment on the fly.

– Increased range for longer riding distances than ever before.

– High volume Bontrager XR3 Comp tires provide great grip even in tough terrain conditions.

– Bosch PowerTube 500Wh battery powers the entire drive train without weighing down ride.

Motor & Battery

The 2023 Trek Powerfly FS 4 comes equipped with a Bosch Performance CX electric motor that provides up to 85 Nm of torque.

You can expect roughly 40 miles (64 km) on the 500Wh battery.

Frame & Suspension

At its core, the 2023 Trek Powerfly FS 4 is built with an oversized aluminum frame that offers 100mm travel at both ends in either 27.5 or 29er wheel sizes.

To ensure your ride stays smooth no matter what terrain you encounter, you can run up to a 120mm front fork.

If you want crisp shifting performance even in steep sections then this bike has you covered thanks to its 1×11 drivetrain consisting of Shimano Deore level components.

The cassette offers a 11-46t and its paired to a 36t chainring up front mounted to a FSA Bosch crankset.

Other features include powerful Tektro hydraulic disc brakes for assurance when descending rough trails as well as custom Bontrager Alex MD35, tubeless compatible wheels that have been designed especially for e-MTB use.

It also comes with a remote fork lockout so you can instantly stiffen your front end when climbing those stubborn hills.

Final Verdict

All things considered, if you’re looking for an all mountain electric mountain bike then the 2023 Trek Powerfly FS 4 should definitely be one of your top choices due to its versatile components and great price point made possible through countless hours of engineering from Trek’s research team.

Order online and have it shipped to your local dealer for final assembly!!

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TREK Powerfly FS 4 625Wh Gen 2 Electric Mountain Bike in Aquatic and Black

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Season:2022

Code:32818AQUticBLK

It's right for you if...

You want to get out and explore more trails. You're looking for an e-MTB with trail-smoothing full suspension and the reliable, leg-boosting power of an electric drive system made specifically for the demands of off-road riding.

The tech you get

A durable aluminium frame that fully encases a long-range 625 Wh battery, a powerful Bosch Performance CX (250 W, 85 Nm) motor that helps you sustain speeds of up to 25 km/h and an ergonomic Purion controller. Plus, a 120 mm suspension fork, 100 mm of rear travel, a 10-speed Shimano drivetrain and a dropper post.

The final word

This full suspension e-MTB is comfortable, efficient and fast on rough terrain. The powerful Bosch electric drive system makes it possible to tackle any climb you encounter and adventure farther than ever.

Frame Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armour, magnesium rocker link, rack and mudguard mount, ABP, Boost148, 100 mm travel

Fork Size: XS , S SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 100 mm travel

Size:M , L , XL SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 120 mm travel

Shock SR Suntour Edge R, 190 mm x 45 mm

Max compatible fork travel 120mm (XS & S: 520mm axle-to-crown, M & up: 545mm axle-to-crown)

Hub front Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle

Hub rear Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle

Skewer rear Bontrager Switch thru-axle, removable lever

Rim Alex MD35, tubeless compatible, 32-hole, 35 mm width, Presta valve

Tyre Size: XS , S Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35"

Size:M , L , XL Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"

Max tyre size Frame: 29x2.40" (XS & S: 27.5x2.60") Fork: See manufacturer

Shifter Shimano Deore M4100, 10 speed

Rear derailleur Shimano Deore M5120, long cage

Crank FSA Bosch CK-220, 36T ring, 165 mm length

Chainring FSA, 36T, steel

Cassette Shimano Deore M4100, 11-46, 10-speed

Chain KMC X10, 10-speed

Pedal VP-536 nylon platform

Max. chainring size Max: 46T, Min 34T

Saddle Bontrager Arvada, steel rails, 138 mm width

Seatpost Size: XS , S , M TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length

Size:L , XL TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length

Handlebar Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width

Grips Bontrager XR Trail Comp, nylon lock-on

Stem Size: XS , S Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length

Size:M , L , XL Bontrager Comp, 31.8 mm, Blendr compatible, 7-degree, 70 mm length

Head set FSA IS-2

Brake rotor Tektro, 6-bolt, 203 mm

Brake Set Tektro HD-M275 hydraulic disc

Battery Bosch PowerTube 625

Charger Bosch compact 2A, 100–240V, smart system

Motor Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand

Computer Bosch Purion

Weight M - 24.83 kg/54.75 lb

Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

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• Rider Notes

2022 Trek Powerfly 4

A 27.5″ / 29″ aluminum frame hardtail trail e-bike with upper mid-range components.

Manufacturer Price

Powerfly 4 FS Gen 2

In Stock: LG

Powerfly Sport 4 EQ Gen 4

In Stock: MD

For This Bike

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Based on frame geometry and build specs.

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

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Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes. Report your fit

Sep 2022 · Mike Hunger

We have tested the Trek Powerfly FS 9 Equipped with Bosch Performance Line CX motor and 625 Wh battery for you.

Wide range of applications

Sporty and stylish look

Intuitive handling

Bosch SmartphoneHub ensures good connectivity

Read Review

Feb 2022 · Russell Burton

A well-specified, comfortable and versatile ebike, but at a serious price

Expensive, especially if you’re considering leaving it outside the local shop

Jan 2021 · Susanne Feddersen

One bike for all occasions – with the Trek Powerfly FS 7, the American brand promises to have created a true all-rounder. The smart concept should please everyone from trekking and leisure riders to moderate trail adventurers. We tested the 120/100 mm travel eMTB with the Bosch Performance Line CX motor to find out whether the new Trek Powerfly FS 7 is the all-rounder that many have been looking for.

All-round capabilities

Overall concept

Good-natured and intuitive handling

Confidence-inspiring

Comfortable riding position and low top tube

Responsiveness of the fork is mediocre

No model featuring the Nyon display

Price: $5999.00 | Model Year: 2021 | A premium

A premium "do anything" full suspension electric bike that's equipped to handle pavement, trails, light mountain terrain, rain, shine, day, or night conditions. Available in five frame sizes for optimal fit, the XS and S come with 27.5" wheels and the M, L, and XL come with 29" wheels. Sold through one of North America's largest network of dealers. Trek and Bosch provide excellent support and warranty.

Custom made extra-wide plastic fenders are durable and quiet, very capable in off-road conditions. A sleek and sturdy rear rack provides 25kg (55lbs) of cargo capacity with pannier hangers on both sides and a removable top platform for trunk bags. Puncture resistant tires also feature unique black reflective stripes that combine safety with aesthetics.

Downtube-integrated battery pack and mid-drive motor keep weight low and center. Trek designed a "RIB" battery casing includes a handle for safe removal and transport. The battery doesn't rattle, and it can be charged on or off the bike with the fast 4 amp charger. Peformance Line CX motor is the most powerful from Bosch, but lightweight with a magnesium casing.

Highly adjustable air suspension front and rear with 120mm and 100mm travel respectively. Boost hub spacing and thru-axles increase wheel strength. Extra large 203mm hydraulic disc brakes with heat sinks and alloy cores deliver incredible stopping power. The biggest trade-offs here include the high price, smartphone display (that some may not like), louder motor operation, and increased weight (due to the high capacity battery and accessories).

The 2021 Trek Powerfly full suspension e-MTBs blend European sensibility with modern trail capability for a unique e-mountain bike option.

If I had to think of one common theme that continually came up during our time with the Powerfly, that would be it—too damn fun. Over the months we’ve had this bike, we’ve done it all and it does it all with ease.

Oct 2018 · Alan Muldoon

Up hill or down, ebikes take an absolute beating, so the new Trek Powerfly 9 has a beefed up the parts package to handle the additional abuse.

Suspension, brakes and tyres are all on point. New battery layout is neat and easy to use.

Could have more generous reach measurements and shorter stems on all sizes.

New in this Powerfly generation are an advanced removable battery system, carbon fiber frames, purpose-built ebike components and the 150mm of travel in the LT model. - Mtbr.com

Last updated April 28 Not listed for 40 days

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Trek Powerfly FS9 Equipped review

An assisted full-suspension, big-travel commuter?

Russell Burton / Immediate Media

Russell Burton

Comfort; range; stability

Expensive, especially if you’re considering leaving it outside the local shop

The FS9 is top of Trek’s four-model Powerfly Equipped range of electric bikes designed to combine practicality for commuting with the off-road fun of the best mountain bikes .

Its specification, which combines a long-range 625Wh battery, a Bosch Performance 250W motor and a full-suspension setup with powerful four-piston brakes, is sending a message that it won’t flinch when the going gets tough.

Trek Powerfly FS9 Equipped specifications

At first glance, all that off-road tech seems at odds with the bike’s more sedate features, which include integrated full-length mudguards, a kickstand and built-in lights.

Trek’s promo video shows the sort of shopping trip we all wish we had, with a route mixing road and scenic dirt track, and I approached my first ride on the Powerfly hoping this could be the commuter bike of my dreams .

The strong Bontrager Line Comp 30 wheels, shod in chunky 29x2.4in tyres, the SR Suntour Zeron 35 120mm suspension fork and RockShox SID Luxe Select+ rear shock are pulled from the mountain biking world.

It’s a combination that would normally be compromised by its weight for commuting, but in pairing it with an 85Nm motor so powerful as to be unbothered by extra heft, Trek has managed to optimise the Powerfly for the commute.

And who wouldn’t want comfortable, grippy tyres, powerful brakes and plush suspension?

That suspension was something that gave me pause for thought before testing – can a full-suspension machine with a mountain bike heritage be efficient on the road? Yes. Keep reading to find out how.

Trek Powerfly FS9 Equipped geometry

Trek powerfly fs9 equipped battery life.

Not that I have experienced problems with battery range, regularly riding 70-90km, including over 1,000m of climbing, and arriving home with plenty in the tank.

There are four modes – Eco, Tour (eMTB Lite), eMTB and Turbo – and even on longer routes, I didn’t have to drop to Eco to preserve battery life, riding mainly in Tour mode with short boosts of added power.

Trek Powerfly FS9 Equipped ride impressions

I’d not used this fork before and it surprised me – in a good way. It's stiff enough to support the bike’s weight, it doesn’t bounce when you’re pedalling hard on the road, yet it sucks up the chatter of poor tarmac.

Transitioning to forest tracks, it smooths the ride so you barely lose speed over rocks and roots.

The rear shock is unusually positioned behind the seatpost, but is protected by the full mudguard. It absorbs the bumps but, as with the fork, doesn’t bounce. It plants the back wheel into the ground in a way that feels secure and maintains grip right through corners.

That security and control is underlined by the Shimano XT four-piston brakes, which are strong enough to slow the weight of the bike quickly and smoothly without locking.

The Powerfly FS9 Equipped seems to love going fast in a straight line the most, and the distances I’ve ridden on a mix of roads and tracks are testament to its comfort and ride appeal.

It does, however, have limits on more technical terrain.

I’ve ridden it over the same terrain I use for testing the best electric mountain bikes , and there is no comparison – it doesn’t have the handling finesse for tight, twisty stuff.

If you have the skills, yes, you’d do it, but probably not in quite the style you’d like.

Sweet-spot pedalling helped by smart modes

The 10-51t gearing range is huge, but still I found myself succumbing to the temptation to stick to a few of the lower gears and default to switching between power modes.

It’s a habit that doesn’t get the most out of you or the motor, so I played with the onboard app and discovered it gives a readout for optimum cadence, turning green when you get it right.

That’s all to the good, though the weight means it’s not a bike you want to be caught out on without power. Moving between modes is quick and smooth, the motor picking up exactly where it needs to.

My only gripe is that when it tops out at 26km/h, the cut-off feels abrupt and the bike slows rapidly before kicking back to life. It’s not a seamless experience.

Accessories for the win

The mudguards have good clearance and keep off most of what gets thrown up, even from wet, muddy tracks.

In fact, I came to appreciate all the commuting-specific accessories more than I expected. A kickstand may not feel that exciting, but once I used this rather than propping the weighty ebike against a wall, I was converted.

The built-in lights are powered by the battery, so there’s no reason to get caught without working illumination. The sturdy rack will bear up to 25 kilos and is compatible with most panniers .

Trek Powerfly FS9 Equipped bottom line

The Trek Powerfly FS9 Equipped is an electric bike that makes you want to ride more – it allows you to take the more interesting routes less travelled on your commute and have fun on forest tracks at the weekend.

It would also be ideal for touring on long-distance tracks such as King Alfred’s Way in the south west of England, given its range, comfort and load capacity.

Embrace its niche and you’ll get the best out of this bike, and it could well get the best out of you as a rider – if you can afford it.

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• Powerfly FS 4 Gen 2

"Powerfly FS wins Best in Test"

"Powerfly FS blends sporty handling, efficient propulsion and long-distance comfort into a harmonious overall concept. The result: pure riding fun! "

E-MTB Category Winner

"The jury was enthralled by the upright and comfortable riding position on long tours while the bike also shines on moderate terrain thanks to its fun ride and intuitive handling."

Get rewarded for going electric

Electric bike rebate programs are popping up all over the country, meaning you could save big when you buy a Trek e-bike! See if you're eligible for a rebate near you.

How to responsibly recycle your e-bike battery

How to ride on mountain bike trails.

Guidelines and tips for protecting and sharing the trails you ride.

5 things to do before every mountain bike ride

Do this quick pre-ride safety check before you hit the trails.

How do Bontrager WaveCel helmets work?

Learn more about a major advancement in the protection against cycling-related head injuries.

Product features

Bosch performance line cx motor.

Bosch Performance Line CX sets the standard for eMTB performance with up to 85Nm of torque and an intelligent eMTB mode with Extended Boost that automatically adjusts the amount of assist based on the terrain.

Custom eMTB Lite mode

Trek eMTBs feature a custom eMTB Lite mode in place of Tour mode. It gives you more natural-feeling power delivery and longer battery life.

Removable Integrated Battery

RIB is a one-piece battery and cover with a built-in handle that can easily be removed and re-installed in the frame with no tools and no hassle. It’s the most convenient way to remove your battery for transport, security, or just easier charging.

What is the range?

To see how far you can ride your electric mountain bike on a single charge, check out Bosch’s range calculator. We’ve auto-filled the variables for this bike model and the average rider, but you can make adjustments to get your most accurate estimate.

Compliant with leading safety regulations

The e-systems on Trek and Electra e-bikes are third-party tested to meet the latest e-bike safety regulations, including the stringent UL 2849 certification — so all you have to worry about is where your e-bike will take you next.

Suspension Calculator

This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.

Bosch Purion Display

Bosch's Purion display features a fully-functional speedometer with a backlit display, service interval indicator, and battery range indicator. Its thoughtful design allows riders to scroll through functions or choose the right level of support while maintaining contact with handlebars.

Smart Wheel Size

The right wheel size paired with your frame size gives you the perfect combination of responsiveness and control.

Dropper post

Use the remote lever to lower your saddle so it's out of your way when you're descending and cornering.

Integrated speed sensor

You've got one less detail to sweat with the integrated speed sensor. The chainstay-mounted sensor stays protected while the custom hub-mounted magnet stays secure—no more error codes from mis-aligned sensors.

Lighting ready

The bike is already internally wired to accept additional lights. Go to your dealer and simply have them attached to the bike and plug them in.

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• Powerfly 4 625w Gen 4

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Trek Powerfly FS 4 625 Gen 2

• AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Size / XS, SM, MD, LG, XL

At a glance

Where to buy.

Specifications

• Frame Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, internal routing, Motor Armour, magnesium rocker link, rack and mudguard mount, ABP, Boost148, 100 mm travel
• Fork Size: XS, S, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 100 mm travel; Size: M, L, XL, SR Suntour XCR 34, air spring, LO R damper, hydraulic lockout, tapered steerer, 44 mm offset, oversized crown for eMTB, Boost110, 15 mm bolt-on thru axle, 120 mm travel
• Shock SR Suntour Edge R, 190 mm x 45 mm
• Motor Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand
• Battery Bosch PowerTube 625
• Hubs Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle
• Wheels Alex MD35, tubeless compatible, 32-hole, 35 mm width, Presta valve
• Wheel Size 29" 27.5"
• Tires Size: XS, S, Bontrager XR3 Comp, wire bead, 30 tpi, 27.5x2.35""; Size: M, L, XL, Bontrager XR3 Comp, wire bead, 30 tpi, 29x2.30"
• Chain KMC X10, 10-speed
• Crank FSA Bosch CK-220, 36T ring, 165 mm length
• Bottom Bracket Bosch, press-fit
• Rear Derailleur Shimano Deore M5120, long cage
• Shifters Shimano Deore M4100, 10 speed
• Brakeset Tektro HD-M275 hydraulic disc
• Handlebar Bontrager alloy, 31.8 mm, 15 mm rise, 720 mm width
• Saddle Bontrager Arvada, steel rails, 138 mm width
• Seatpost Size: XS, S, M, TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length; Size: L, XL, TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length
• Stem Size: XS, S, Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 60 mm length; Size: M, L, XL, Bontrager alloy, 31.8 mm, Blendr-compatible, 7-degree, 70 mm length
• Grips Bontrager XR Trail Comp, nylon lock-on

Q: How much is a 2023 Trek Powerfly FS 4 625 Gen 2?

A 2023 Trek Powerfly FS 4 625 Gen 2 is typically priced around €4,599 EUR when new. Be sure to shop around for the best price, and also look to the used market for a great deal.

Q: Where to buy a 2023 Trek Powerfly FS 4 625 Gen 2?

The 2023 Trek Powerfly FS 4 625 Gen 2 may be purchased directly from Trek .

Q: What size wheels does the 2023 Trek Powerfly FS 4 625 Gen 2 have?

The 2023 Trek Powerfly FS 4 625 Gen 2 has 29" and 27.5" wheels.

Q: What size 2023 Trek Powerfly FS 4 625 Gen 2 should I get?

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UVB-76 (The Buzzer)

From hfunderground.

UVB-76 , (Now "ANVF", formerly "MDZhB" and "ZhUOZ") is the callsign of a HF radio station that usually broadcasts on the frequency 4625 kHz on a USB (Upper Side Band) signal. It is known among radio listeners by the nickname The Buzzer . It features a short, monotonous buzz tone, repeating at a rate of approximately 25 tones per minute, for 24 hours per day. The station has been observed since around 1982. [1] . Until 2010, most voice transmissions in the Russian Monolit code signal were rare.

The Buzzer has four callsigns: UVB-76, MDZhB (Mikhail, Dmitri, Zhenya, Boris), ZhUOZ (Zhenya, Ulyana, Olga, Zinaida), and ANVF (Anna, Nikolai, Vasily, Fyodor)

Normal transmission

The station transmits a buzzing sound that lasts 0.8 seconds, pausing for 1–1.3 seconds, and repeating 21–34 times per minute. [1] One minute before the hour, the repeating tone is replaced by a continuous tone, which continues for one minute until the short repeating buzz resumes. Between 07:00 and 07:50 GMT the station transmits using lower power, when transmitter maintenance apparently takes place.

The Buzzer has apparently been broadcasting since at least 1982 [1] as a repeating two-second pip, changing to a buzzer in early 1990. [2] [3] It briefly changed to a higher tone of longer duration (approximately 20 tones per minute) on January 16, 2003, although it has since reverted to the previous tone pattern. [4]

It is believed that the buzzer is not directly modulated but actually recorded by a active microphone, as there have been reports of hearing background chatter while the buzzer was on.

Location and function

The station's transmitter was located just outside Povarovo, Russia at 56°4′58″N 37°5′22″E, which is about halfway between Zelenograd and Solnechnogorsk and 40 km northwest of Moscow, near the village of Lozhki. The location and callsign were unknown until the first voice broadcast of 1997.

In September of 2010, the station was evacuated, the station transmitter was moved to the nearby city of Saint Petersburg, near the village of Kerro Massiv. This may have been due to a reorganization of the Russian military. Prior to August 9, 2015, the station is not transmitted from the Kerro Massiv transmitter site ("Irtysh") anymore, possibly due to a reorganization of the Russian military for the particular area which may cause the frequency to be used only in the Moscow Military District. At present, The Buzzer appears to be broadcast only from the 69th Communication Hub in Naro Fominsk, Moscow.

Its purpose is unknown. One website claims the station is meant to "Transmit orders to the military units and recruitment centers of the Moscow military district." This is unconfirmed, and unlikely considering the station transmitted the simple buzz tone for at least 15 years before any words or numbers were broadcast. Because of the nature of the broadcast and the fact that its transmitter location is rumored to be a communications hub of the General Staff of the army, [10] UVB-76 is widely believed to be used to transmit encoded messages to spies, as is generally assumed for the many numbers stations that populate shortwave frequencies. Transmitter sites for some numbers stations have been triangulated to military and/or intelligence installations in several countries, although no nation's government will confirm or deny the existence of the stations or their purpose. Another possibility is that the constant transmission of its characteristic sound is supposed to signal the availability, operation or alertness of some kind of installation, a kind of dead man's switch of a military or other installation, possibly for the Russian Dead Hand system.

Another explanation for the constant buzzer is the High-frequency Doppler method for ionosphere research [11] described in the Russian Journal of Earth Sciences, in which radio waves are reflected from ionosphere inhomogeneities. Changes of an ionosphere state can be caused by solar geophysical or seismic events. This method involves comparing a continuous radio transmission which is reflected by the ionosphere with a stable basic generator. The continuously transmitted carrier frequency currently used for this research matches that of the Russian Buzzer (4.625 MHz).

External links

• Number Stations - Includes discussion of UVB-76.
• NPR's Lost and Found Sound , 2000-05-26: The Shortwave Numbers Mystery
• UVB-76 Station Info - All the information about UVB-76 by Years.
• UVB76 at the Global Frequency Database
• UVB-76 Temporary Internet Relay - Live Internet Streaming site, 900km NW from station.
• Allison McLellan: "Decoding Numbers Stations", QST, 103 (11), pp. 70-74, ISSN 0033-4812, November 2019
• View source

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