Overview

The MVT-7100 is the latest offering in continuous-coverage handheld scanners by Yupiteru, coming on the heels of its very successful and well-received MVT-5000 and MVT-7000 scanning receivers. The 7100 adds substantial increase in capability over the 7000, primarily by dramatically increasing the number of scan channels, expanding the overall frequency coverage, and including sideband reception.

The MVT-7100 is a small, lightweight scanning receiver, offering continuous coverage from 100 KHz to 1.65 GHz! It will receive AM, FM, WFM (wide-FM), USB (upper sideband), LSB (lower sideband), and CW (continuous wave; i.e. Morse code) transmissions.

The 7100 has 1,000 scan channels organized in ten banks of 100 channels each and one additional dedicated channel for priority. It offers ten individual search banks with the ability to lock out up to 500 frequencies during a search. It can search in the following steps:

FM:

1 KHz, 5 KHz, 6.25 KHz, 9 KHz, 10 KHz, 12.5 KHz, 20 KHz, 25 KHz, 50 KHz and 100 KHz.

Wide FM:

50 KHz, 100 KHz

AM:

1 KHz, 5 KHz, 6.25 KHz, 9 KHz, 10 KHz, 12.5 KHz, 20 KHz, 25 KHz, 50 KHz and 100 KHz.

USB/LSB:

50 Hz, 100 Hz, 1 KHz, 5 KHz, 6.25 KHz, 9 KHz, 10 KHz, 12.5 KHz, 20 KHz, 25 KHz, 50 KHz and 100 KHz.

The MVT-7100 is approximately 6.5 inches high, 2.5 inches wide, and 1.5 inches deep, minus the antenna and belt clip. It is just slightly taller than the Radio Shack PRO-43, otherwise it is about the same size. The 7100 is a real lightweight, weighing in at only 11.5 ounces, without the antenna, but with the batteries and belt clip.

Accessories

The MVT-7100 comes with an AC adaptor, a set of four nicad batteries (Hitachi 600 mAh), a car cigarette lighter adaptor, a belt clip, a wrist strap, an earphone, and a telescoping antenna with a pivot BNC mount.

Controls

The MVT-7100 is very cleanly laid-out. The top of the unit contains a BNC connector for the antenna, a knob for On/Off and volume, a knob for squelch control, and a tuning knob, which is used for a variety of functions.

On the left side of the unit are three recessed buttons: a momentary light button, a monitor button, and a keylock switch. There is also a small hole which contains a reset switch.

The Light button illuminates both the display and the keyboard with a very nice greenish light. Alas, it only stays on while you hold down the button. When will scanner manufacturers design their products with a method of letting the user keep the light on, especially when plugged into a power source?

The Monitor button immediately opens the squelch fully, allowing you to stop on a weak signal, without worrying about the scanner resuming its search or scan.

The Keylock performs the usual keyboard lockout of functions. It locks everything except the volume and squelch controls and the light and monitor buttons.

On the right side of the unit, you'll find a small hook which is where you attach the wrist strap. Both the earphone jack and the power plug are also on the right side of the unit.

The belt clip attaches on the back and the battery compartment opens from the back.

The MVT-7100 has a 15db attenuator feature built-in, but you select it with a keyboard combination, rather than with a separate button.

The Keyboard

The keyboard is arranged in a 5 X 5 matrix. The keys are as follows:

 1        2        3         SRCH
ATT    DELAY     SKIP         PRI

 4        5        6         SCAN
SAVE    BEEP     PGM          MW

 7        8        9         STEP
M>VFO  M-SCAN   P-SCAN       MODE

^         0        .          MR
MHz      SPR                  BW

v       C/AC     ENT         FUNC
        PASS

The top label of each row is on the key itself and the bottom label is below the key. You get the top function by pressing the key and the bottom function by first pressing the FUNC button and then they key. The ^ and v symbols represent up and down arrows. The arrow buttons, along with the tuning knob, are used for stepping through memory and selecting mode and step increments.

The keys are relatively large size for a scanner this small and are very easy to press. When the beep feature is turned on, the scanner gives a variety of audio feedback when you press a key. This sound can be turned off, if desired.

The Display

The MVT-7100 uses a large LCD display to show the channel number, the frequency, and

various annunciators. The channel and frequency digits are very large and easy to see. There is a second level of annunciator, like the mode types (AM, FM, etc.) which are smaller but still easy to discern. The third level of annunciators, however, are down-right microscopic and are just about impossible to make out, except in strong sunlight. You will primarily learn to identify these annunciators by their positions, rather than by the actual text.

The display also shows a 9-segment signal strength meter across the bottom, which is a very useful addition.

The MVT-7100 was obviously designed to be held in the hand, nearly parallel with the floor, so that the display is viewed from below. The contrast is best when viewed from this angle. When viewed straight on, the display is marginal and when viewed from even slightly above eye-level, the display is virtually unreadable. Apparently the designers didn't think many people would sit the scanner on end and look at the display directly. In addition, the plastic covering over the display is highly reflective and picks up glare easily.

In general, the display won't give you too many problems, but it could have been better. There is no contrast control for the display like there is on the MVT-7000.

Operations

In terms of operations the MVT-7100 is much easier to learn and use than the AOR AR1000/AR1500 but not nearly as easy as the PRO-43. This is probably because Yupiteru hasn't licensed the Uniden patents for scanner operation.

The scanner contains ten banks of 100 channels each, addressed by channel number. It uses a fairly wacky numbering scheme, however. Bank 1 contains channels 000 through 099, bank 2 contains 100 to 199, etc. bank 0 contains 900 to 999. In other words, in bank 2, for example, you will never find a channel that starts with a 2! This may be a bit confusing, especially if you've used other scanners that number their channels a bit more normally.

The Yupiteru uses a VFO (variable frequency oscillator) mode to hold "temporary" frequency information. You enter a frequency into the VFO, select its mode, and step increment, and then store it into a scan channel. You can't operate on a value in a scan channel directly. You must first move it into the VFO, modify it there, and then write it back into the scan channel. The keys to perform these operations are:

nnn MR (nnn is the channel number. MR reads the frequency into the VFO).

FUNC MODE (to change the mode).

Choose a mode with the arrows or tuning knob.

STEP (to change the step value).

Chosse a step value with the arrows or tuning knob.

FUNC MW (to write the value back into the same channel).

Once you write a value to a scan channel, the scanner automatically steps to the next channel which makes sequential entry of frequencies extremely convenient.

It might seem unusual to have to indicate a step value when simply storing a frequency into a scan channel. This is due to the interaction of the tuning knob/arrow keys with the VFO. They let you change the current frequency up or down, based on the step value. An unfortunate side effect of the step value is that it rounds off a frequency so that it conforms to the current step value.

For example, if you enter 488.3375 MHz into the VFO, but the step value is 10 KHz, the frequency will automatically be converted to 488.3300. In order to enter in 488.3375, you need to use a step of either 12.5 or 6.25 KHz. This isn't as bad as it may seem, however, because, once you do enter in the proper step, you can simply dial in the frequency you want. The display jumps by the step value when you use the tuning knob or the arrow keys.

It turns out that for most frequency entry, this capability, along with the automatic advance to the next sequential scan bank, makes the MVT-7100 one of the easiest scanners around for entering frequencies--something you will appreciate when you try to fill up all 1,000 scan channels.

Scanning

Scanning on the MVT-7100 is a little unusual. If you just hit the SCAN button, the unit starts scanning the entire 1,000 channels sequentially. In order to scan a specific bank, you must first press the bank number and then the scan button. For example, to scan bank 5, you would press 5 SCAN. This is not so strange, except that the unit doesn't remember which bank or banks you were scanning if you do anything to stop the scan. You have to press the bank number(s) each time or the scanner will try to scan the entire 1,000 channels, which is basically useless.

You may specify up to four banks to be scanned this way by entering in their numbers before pressing the SCAN button. For example, to scan banks 3, 5, and 9, you would press 359 SCAN. While it seems strange to limit the number of banks to four, in practice this is not much of a problem, since you will rarely want to scan more than 400 channels at one time.

The arrangement of the memory as a 10 by 100 channel matrix is awkward because your smallest "chuck" of memory is 100 channels. However, the MVT-7100 has some additional features that allow you to better divide how you use these 1,000 channels.

First, you may lock out (it's called "Pass" in the MVT-7100) any channel in the scanner so that it isn't included in a bank scan. This works the way it does in most scanners, although there isn't a separate display indicator for lockout. Instead, the CH (channel) annunciator blinks on a channel that has been locked out.

The MVT-7100 has three different scan methods. The first is normal scan, which is as described above. You specify a bank and it scans all unlocked channels in that bank. You may also set up a programmed scan. You may specify up to ten channels per bank as "programmed" channels. When you do a programmed scan of a bank, only the programmed channels are scanned. This means that you can have a separate sub-group of ten channels per bank that are scanned independently.

You perform a program scan like this:

nnnn FUNC P-SCAN (nnnn represents 1 to 4 bank numbers).

If you designate a channel as a programmed channel, it will be scanned in a program scan, even if the channel is locked out.

You may also specify a mode scan for up to four banks (or all ten banks if you don't specify any bank number). This will scan only the channels that are in the same mode as the VFO. You perform a mode scan like this:

nnnn FUNC M-SCAN (nnnn represents 1 to 4 bank numbers).

These various scan options let you break the 100 channel bank into more useful sub-groups. For example, let's say that you put all 40 CB channels into the first 40 channels in bank 5 (401-440). CB is in AM mode. You then program your local PD into channels 450-470. They are in FM mode. Finally, you put in some railroad frequencies into channels 480-490. They are also in FM mode, but you mark them as "programmed" channels and also lock them out.

With this arrangement you can scan three independent groups, all in bank 5.

To scan the CB channel, set the VFO to AM mode and perform a mode scan:

5 FUNC M-SCAN

To scan the PD channels, set the VFO to FM mode and perform a mode scan:

5 FUNC M-SCAN

(the railroad FM frequencies won't be included because they are locked out).

To scan the railroad frequencies, perform a programmed scan:

5 FUNC P-SCAN

While you probably wouldn't organize a bank like this, you get the picture.

One of the unusual aspects of the MVT-7100 is that you can't lock out scan banks. All the banks are always included in a scan unless you indicate the specific banks (up to 4) you want to scan. This is the way you will almost always perform a scan.

Searching

The MVT-7100 has ten separate search banks. Each search bank holds an upper and lower limit, a step increment, and a reception mode. You can change the step and the mode any time after setting up the search bank, but you can't change the upper or lower limit without reprogramming the whole bank. You may also turn the attenuator on for the entire search bank.

Unlike scan banks, you may not link together several search banks.

A very useful feature in the MVT-7100 is the ability to lock out specific frequencies during a search. If you constantly stop on a open carrier, a data control channel, or just a noisy frequency, being able to lock out that frequency makes using the search features dramatically more useful, not to mention more enjoyable. You may also review the locked out frequencies and unlock them, if you wish.

Other Features

Skip

The MVT-7100 has a skip feature which is very much like the Seek feature found on some modern car radios. It can be used during either a search or a scan and will stop on an active frequency for 5 seconds and then continue on, even if there is still activity on the frequency.

Priority

The MVT-7100 dedicates a special channel (channel 1000) as the priority channel. This channel is checked every 5 seconds when the priority feature is turned on and switches to it if there is activity on it. Five seconds is really too long a wait for a priority check and you may miss short replies or the beginnings of communications due to this excessive wait. More typical priority delays are about 2 seconds.

Delay

The MVT-7100 has a delay feature but it is a bit confusing. The purpose of the delay is to wait a fixed time after a transmission ends before resuming the scan or search, because there may be a response and you will probably want to hear it. On the 7100, when the delay is off, the unit waits two seconds before resuming. When the delay is on, it waits four seconds! Again, this is probably due to the fact that Uniden holds the patents for variable timed delays on scanners and Yupiteru hasn't licensed them.

What this means is that you can never remove the delay entirely, which may make it a bit difficult to scan certain "trunked" systems. In these cases, the response may be on a different frequency than the original transmission, and if you wait around with the delay, you may miss it.

Save mode

The MVT-7100 has three special battery-saving modes that put the scanner to sleep for brief moments and then wake it up to check for channel activity. This save mode only works when you are in memory or VFO mode. It doesn't work when you are scanning or searching.

This mode can conserve your batteries if you are sitting on one station. You have to explicitly put the unit into save mode each time, and the mode is canceled when you search or scan. It also makes a quiet, but noticeable, popping sound during its save mode.

Attenuation

You may specify a 15db attenuation of the signal on a channel by channel basis. Using the key sequence FUNC ATT, you specify whether a channel has attenuation or not. You may also turn on the attenuator during a search. In this case, the attenuation will apply to all frequencies encountered in the search.

Sound quality

The MVT-7100 has a 100 mW amp that gives good quality sound through the internal speaker. The speaker can be driven at full volume without distortion. The sound quality is a little on the bassy side. While adequate in volume for normal applications, you may need additional amplification when using the 7100 in the car.

Performance

The MVT-7100 is a real champ when it comes to performance. It is fast, sensitive, and relatively easy to operate. More detailed descriptions of its performance characteristics follow.

Speed

The 7100 scans and searches at approximately 30 channels per second. However, the "relative" speed during a search may be reduced considerably if you can't use the proper search increment. For example, if you want to search through the CB channels, you will find that they are spaced 10 KHz apart. However, they are on 5 KHz boundries; e.g. 26.965 MHz, 26.975 MHz, etc. This means that you have to set the step value at 5 KHz or you won't be able to actually enter in the frequency. You search twice as many frequencies as you have to at 5 KHz, effectively halving the search speed. Some increments useful in the U.S. (15 KHz and 30 KHz) are missing.

Sensitivity

The MVT-7100 is an extremely sensitive scanner, comparable to, if not better than, the very sensitive PRO-43. The user's manual gives these sensitivity figures (levels in uV at SINAD 12 db -- lower is better):

  Frequency   Range         AM       FM      WFM     USB/LSB
   0.53 MHz -    2 MHz     10.0   
   2.0  MHz -   30 MHz      1.0      1.5              1.0
  30.0  MHz - 1000 MHz       .5       .5     .75       .5  
1000.0  MHz - 1300 MHz               1.0   

These are fairly conservative figures and don't accurately reflect the real sensitivity of the unit. A review, performed by Scanners International in April 1993, gave these laboratory test results (levels in uV at SINAD 12 db):

Frequency        AM          FM        WFM        SSB
 500 KHz        3.94        2.33        -         5.13
   1 MHz        1.27         .76        -         1.45
   2 MHz         .58         .35        -          .75
   4 MHz         .40         .23        -          .38
   6 MHz         .32         .17        -          .27
  10 MHz         .26         .16        -          .23
  20 MHz         .22         .13        -          .16
  30 MHz         .22         .12       .36         .14
  60 MHz         .22         .13       .39         .14
 100 MHz         .21         .12       .38         .13
 145 MHz         .25         .16       .48         .18
 250 MHz         .29         .17       .73         .21
 435 MHz         .35         .22       .67         .26
 700 MHz         .46         .21       .77         .38
 935 MHz         .37         .21       .55         .33
1300 MHz          -          .47      1.73          -
1500 MHz          -          .52      2.08          -
1650 MHz          -         1.31      4.71          -

Intermod

The 7100, like any sensitive, wide-range receiver, is subject to intermod at various places across the radio spectrum. Users have reported interference from pager signals and FM broadcast stations at various frequencies. Depending on where you live, you may find this more or less of a problem, especially if certain highly used bands are wiped out.

Images

The MVT-7100 is triple converted and has very few problems with images.

RFI sensitivity

The unit could be better shielded than it is. It definitely picks up radio frequency interference from computers and will lock up at a variety of different frequencies. You may need to be as far away as 20 feet from a computer to avoid this problem. I haven't noticed much RFI while operating the scanner in a car.

SSB operations

One of the special capabilities of the MVT-7100 is the ability to decode single sideband transmissions. Rather than requiring the use of a beat frequency oscillator (BFO), the 7100 uses true carrier injection to provide SSB reception. However, there are still a couple of things to consider. SSB signals are designed to be tuned 1.4 KHz above and below the carrier in the MVT-7100. So, instead of just dialing in a frequency, setting the mode to USB, and getting the station, you need to tune above the desired frequency by some amount. While 1.4 KHz is the factory spec, each unit tends to be off by a certain amount. In addition, the accuracy may change as the unit warms up. However, once you "zero-in" your own receiver by watching how far off it appears, you will be able to accurately dial in the sideband frequencies you are interested in.

When you are in sideband mode, you get two additional tuning increments: 50 Hz and 100 Hz. These very fine tuning steps make it extremely easy to tune in a station accurately.

As an extra benefit, some users have reported that by listening to speech inversion voice encryption in a sideband mode, they have been able to understand the transmissions!

Power

The MVT-7100 operates on 4.8 VDC via 4 AA batteries. It comes with nicads, however, you may also operate it with alkaline cells. Battery life is between 5 and 6 hours of operation on a full nicad charge. The unit also comes with an external 12 VDC adaptor. The adaptor is a 200 mA, 100VAC adaptor, which is not really adequate for operating the scanner in America. If you operate the scanner with this adaptor, the unit will tend to heat up quite a bit. It is fine for charging the batteries while turned off.

Manual

The manual you get depends on where you obtain the scanner. Yupiteru provides an English translation of the Japanese manual, and it is, as expected, a bit hard to understand. Javiation has rewritten this manual in real English and it clearly describes all the operations of the MVT-7100. It is completely sufficient to get you started, although it doesn't go into detail about things like how organize your memory channels.

Modifications

There are no known modifications to this scanner, although it has only been available a short time. Unfortunately, when you open the unit, you automatically lose all of your programmed scan channels. This is somewhat of a disincentive to people experimenting with modifications or adding RFI shielding to the unit.

Recommendations

This is one of the most powerful, capable, and usable handheld wide-range scanning receivers ever built. The only other scanner with its features is the AOR AR1500 and the MVT-7100 stands heads and shoulders above it in terms of ease of use, sensitivity, and features. In one handheld unit, you have the capability of receiving virtually every type of voice transmission essentially across the entire radio spectrum! It is quite unbelievable. This unit is highly recommended!

Where to get it

The MVT-7100 has not received FCC type acceptance in the United States. This means that there are currently no US importers of this scanner. However, a company in the UK, Javiation, has been able to ship units to individuals in the US, as long as they are not for resale.

Jonathan Clough, owner of Javiation, is available via email to take orders and support users. His support has been superb and he has been extremely helpful in answering questions, expediting orders, and keeping his customers appraised of changing circumstances.

The price of the MVT-7100 will vary depending upon the relative strengths of the US dollar, the English pound, and the Japanese yen. Check with Javiation for the current price. Price includes shipping by Federal Express. Jonathan is offering a one year warranty on units purchased through him.

He may be reached at:

Javiation
Carlton Works, Carlton Street
BRADFORD
West Yorkshire, BD7 1DA
United Kingdom

Phone 0274 732146 (From U.S. 011 44 274 732146)
Fax 0274 722627 (From U.S. 011 44 274 722627)

Javiation CompuServe address: 100117,535.
Javiation web page: http://www.demon.co.uk/javiation/