Why 220 MHz for Amateur Ham Radio, V2.0?

Why 220 MHz for Amateur Ham Radio, V2.0?

220 MHz amateur radio boasts of a long and colorful history, affording it a special place in the hearts of amateur radio enthusiasts. 

Conceptually, amateur radio repeaters are not too different from public safety devices (fire, first response, police) or those in use at federal, business or military services. However, they are often assembled (power supplies, transmitter, receivers, antenna etc.) or commercially packaged to operate only within amateur RF (radio frequency) bands, like 222-224.995 220 MHz band.

History

The Federal Communications Commission (FCC) approved VHF bands as early as 1938, one of them being 1.25 meters (224 MHz) band. Amateur radio activity spiked rapidly in 1960s and 1970s, as 2m and 70cm bands swiftly rose to prominence in the hobby. The commercial spectrum of the VHF and UHF bands became the backbone of emergency service communications like police, fire and ems. The 1.25m band however, escaped the commercial popularity - partly due to lack of enough commercial frequency allocations. Add to it, commercial radio equipment for the band has been scarce. Amateurs willing to go live on this band have had to build their own equipment or buy specialized amateur radio equipment from designated manufacturers. 

Today, the 1.25m or 220 MHz band VHF radio spectrum is universally recognized and reserved for amateur radio use. Primarily available from 222 to 225 MHz, with 219 to 220 MHz for secondary local communications and data. The recent increase 220 MHz amateur equipment and repeaters, like the BridgeCom System BCR-220, have sparked a recent resurgence in band interest. 

Why does 220MHz need a repeater? 

To understand the need for repeaters for VHF bands, it is important to know the science of radio transmissions. High frquency (HF) radio waves bounce off upper atmospheric layers, allowing them to transmit a fairly long distance (albeit with losses).

However, VHF and UHF frequencies are potent enough to pass through, which makes them essentially line-of-sight frequencies.

The only problem is, several natural and artificial barriers tend to impede their progress. Hence repeaters mounted on tall buildings or a high altitude locations act to reinforce the signal quality and improve range. 

It is important to have different frequencies for transmitting and receiving signals - to ensure that both kinds of communications do not interfere. Additionally, it is recommended to keep the signals short, in the vicinity of 30 seconds to ensure that there is enough allowances for emergency signals, although sometimes transmissions up to 3 minutes are allowed.

Amateur Radio Repeater Coordinators however, are essentially volunteering groups - given no official jurisdiction or control over a frequency band controlled by the FCC. 

220 MHz repeater - questions and concerns

Despite high traffic across some pockets of the United States (namely major metros in states like New York, New Jersey, Texas, Washington and California) - the 220MHz band has historically seen less traffic and activity. This could be due to the lack of easily modifiable equipment for amateur use means, the hams have to rely on specialized equipment manufacturers like Wacom, Icom, Sinclair, BridgeCom Systems, or Chinese makes like Baofeng and Wouxun. 

There is also a small matter of the band pair 70cm/2m not being harmonically compatible with 220MHz. Neither is the antenna designed for the band pair resonant at 1.25m. It does enhance the risk of accidental damage owing to unmatched frequency transmission load.  However, the rise in interest has led to refining custom solutions like the GE Mastr II High-Band mobile. It requires considerable refining (modification) of the receiver, additional band pass filters, to filter the transmitted signal, and other electronics to ensure the device performs as expected. 

Other than the scientific aspect, there have been other hurdles. Recently the amateur enthusiasts from the USA and Canada lost 220-222 MHz to commercial use, originally to UPS.  However, UPS eventually chose other open spectrum while 220-222 remained open for commercial use, for example PTC (Positive Train Control Data). The 220 MHz band invites some amount of hesitation owing to its variable past history where it has suffered multiple allocations and reallocations, division, or placement for secondary usage.

In the U.S. with FCC auctioning licenses for commercial use, things have been better. UPS never quite used the 220-222 MHz band and amateurs are pushing for re-claiming or at least maintaining the band. With none of the super-narrowband digital communication companies showing particular interest, it appears that the entire 222-225 MHz band is yet again up for ham activity.

Advantages of 220Mhz repeater

The limited access to commercial equipment does not always mean bad news. The 220MHz repeaters have some distinct advantages over those designed to operate for 2m/70cm pair:

  • Worth the customization effort - a few manufacturers who have made the 220 MHz repeaters have discovered that it's an excellent, low-interference band. That totally makes it worth the effort to even customize equipment.
  • 220MHz band delivers the best propagation among the "big three bands" (70cm, 1.25m or 2m)
  • Increase in recent traffic and commercial interest - Like the 2m band, ever increasing footprint of licensed hams, converted gear from Motorola, MICOR High Band and traffic is convincing manufacturers to pitch in for 220MHz rigs. The repeater market in this domain is on the cusp of bigger commercial investments, like the new BCR-220 repeater from BridgeCom Systems and the New Kenwood 220 D-STAR handheld, and a new 220 D-STAR Dual mode repeater from BridgeCom.
  • Change in 220MHz perception - With the 'lack of commercial gear' myth being busted for the 220 band - attractive prices for equipment is a reality. The repeaters out there today can adapt from weak-signal work to FM. Serious VHF contesters are making a move to leverage 220 using SSB and CW, for the extra multipliers.

Increased traction of Amateur radio and ham clubs towards the 220 band naturally creates the demand for technology refinement in 220 MHz repeater space. 

BridgeCom Systems BCR-220 FM Repeater System (222-225 MHz)

BridgeCom Systems BCR-220 Repeater Package

At BridgeCom Systems, we take this as an opportunity to offer our latest repeater to the amateur radio market, the BCR-220 Repeater. With a built-in 10A power supply and solid 13.8V output (with battery back up and in-built charging unit) this repeater packs solid RF power. It is Dual fan-cooled, has a built-in controller for CWID and tone decoder/encoder, LCD display and 30 watt continuous duty power for the 1.25m band. This makes the BCR-220 repeater one of the best available in the amateur radio space.  A must-have for your personal or club use.

Learn more about it here or Call us today at 816.532.8451

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Comments

MICHAEL WASCHBISCH - August 29, 2018

Be the 1st to produce a 220 Ham DMR radio TDMA Tier II.
This would reinvigorate the 220 band as DMR Digital has now over 105,000 users world wide..I would really like to see some 220 DMR digital repeaters on the air..but we need someone to manufacture the subscriber radios. DMR has won the digital format race to have over all the other digital modes such as P25, Fusion, and D-Star..mainly due to its dual time slot voice capacity per repeated 12.5Khz channel..So what radio manufacture will make the 1st 220 DMR radio? This would be a game changer for the 220 band and begin to put it back in use! I have 900 Mhz DMR..works great but as you know 900 has short distance coverage. As Hams we can now make 220 repeaters simply out of analog units with MMDVM modem boards but we just need a manufacture to get on board to produce the subscriber radios. Is this something BridgeCom can do?
Mike – N9OEZ

John - December 27, 2016

Hello,
I have decided to get on 220 – the prices of equipment has dropped to the point where everyone can get a radio who wants one. I found one on Amazon yesterday for $18 – dual band 2m/1.25m, and cant wait to get on the air with it.
Lets get on the air with this band!
’73
John

Dave Pitre - December 6, 2016

I use the 220 mhz band here in Canada and Love it. Not many people use the band so the band is often quiet.
The only interference I have gotten is from driving past those big electronic bill boards. Not sure why? Possible they oscillate near the 220 mhz band? I may also need to try moving frequencies.

Bruce Thorpe N7MMR - November 21, 2016

As a years-long enthusiast of 220-225 MHz operations, I’d love to do my bit towards recovering the bottom two megs. Any suggestions and/or help will be more than welcome. In general—and please forgive me for going somewhat off-topic—let this loss be a lesson to ALL of us Amateurs! Yours, Bruce Thorpe N7MMR, Phoenix, AZ

Phil Schoenthal, N2MDV - June 8, 2016

One huge advantage of 222MHz is going to a Hamfest. If you go with a party with 222MHz HT’s, you’ll have the FREQ’s all to yourselves, no desense and and walking over each other, like what happens on 2M and 440. Another advantage of 222MHz? Going mobile, less hash and trash from computer generated noise driving past banks, gas pumps, and industries with extremely spurious power inverters. Oh, and little, to no, out of bands desense and IMD, like what you get from noisy VHF / UHF pagers. EME users tell me that 222MHz is great since little, if nothing, interferes with their operations there, unlike other bands. Neat things to consider about 222MHz. That’s why the military and commercial interests want it.

jim - February 18, 2016

great help with this video!!!

Dreux Jacques - July 18, 2015

2 commments;
1 the internal duplexer for the 220 repeater…..is one available and how much installed.
2 Are there provisions to run the repeater from 220 225 mhz later.

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