Do you have scanner frequency lists available? |
How do I enter a 7-digit frequency when the scanner only takes 6 digits? |
What is meant by the "step-rate" of a scanner? |
How do I tell if my scanner uses dual or triple conversion? |
What does "SMR" mean in call book lists? |
Product: Programming | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: Do you have scanner frequency lists available? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: The only
source we have for scanner frequencies is the "Police Call" directory for your
area, which should be available through your local RadioShack store and can also be
ordered on-line or by calling 800-843-7422. The catalog numbers for the "Police
Call" books are as follows:
The Police Call Directories are also available as a single Compact Disc (Cat. No. 620-2502). These can be purchased on-line by clicking on the number link to go to the catalog page. |
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Product: Programming | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: How do I enter a 7-digit frequency when the scanner only takes 6 digits? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: You will need to round off the last digit. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Terminology | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: What is meant by the "step-rate" of a scanner? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: This is
the function of the step rate of the scanner: 856.2675 less the beginning frequency of the band, which, in this case, is 851.0000 MHz equals 5.2675 divided by the step rate, which is 0.0125 (12.5 kHz) equals 421.4. Since this number is not an even full number, the scanner will drop back. To find out how much - multiply the full number portion (421) times 0.0125 which equals 5.2625 plus the beginning frequency in the band, 851.0000 equals 856.2625. Use either that number or that number plus 0.0125 which equals 856.2750. Usually, one of the two calculated values will be close enough to pick up the desired channel. |
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Product: Terminology | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: How do I tell if my scanner uses dual or triple conversion? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Look at the number of IF Frequencies. Dual-conversion scanners have only 2 IF frequencies; triple-conversion scanners have 3 IF frequencies. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Back to Index | Back to Top of Section 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Product: Terminology | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: What does "SMR" mean in call book lists? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: "SMR" indicates a Service Maintenance Repeater. Radio operators must be a member of that club to transmit to that repeater. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: My scanner hangs up on a particular frequency; however, the problem goes away when I remove the antenna. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: If you
remove the antenna and it goes away, this indicates that the problem is either a signal in
the air OR a strong nearby signal is mixing with something else and forming an IMD
(Intermodulation) product at that/those frequencies. To fix this, you will need to either:
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: Why does my RadioShack scanner pick up the same transmission up on a different frequency from the frequency I receive on a super-heterodyne or dual-conversion scanner? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: The
frequencies that you're picking up on your original scanner are images or harmonics of the
frequency that you are actually listening to. This is a common result when changing from a
scanner that utilizes simple super-heterodyne versus a scanner with triple conversion. The
actual frequency that your original scanner is picking up is a second or third harmonic
away from the actual frequency being transmitted. The RadioShack scanner should be picking
up the correct frequency. For example, 145.000 MHz has the following harmonics:
This is an example of triple conversion versus simple super-heterodyne, or dual conversion methods of receiving. The frequency received will be truer to the actual frequency transmitted on a scanner/receiver with triple conversion than on one with dual conversion and much the same when comparing dual conversion to simple super-heterodyne. The methods of using double or triple conversion aid in eliminating unwanted images (ghost frequencies) and other types of noise present in the different band of frequencies. |
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: I need a service manual, and the local store said there isn't one for my scanner. Why? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Early in
1997, representatives from the scanner industry, including RadioShack, met informally with
the FCC to discuss current problems in the scanning hobby. Identified as a major problem
was the ability of some scanner hobbyists to develop illegal modifications that allow
scanners to receive cellular telephone transmissions. Among the possibilities discussed
for eliminating this problem were the total epoxying of all circuit boards, which would
render scanners both unmodifiable and unserviceable, or the restriction of technical
information regarding scanner circuit design. As a result of this meeting, RadioShack limited the availability of scanner service manuals to RadioShack Service Centers only. While RadioShack understands the desire of the do-it-yourself community to have easy access to service information, we feel the interests of the scanning hobby as a whole are best served by making it more difficult to develop illegal modifications by restricting access to some service manuals containing schematics. Therefore, in response to industry concerns, RadioShack is implementing the following policy in regards to the release of service information and the servicing of scanners. RadioShack will withhold schematics (service manuals) for all scanners that can receive 800 MHz or above which were submitted for FCC certification after April, 1997. As of December 12, 1997, this means that service manuals for the following RadioShack scanners will not be available: 20-417 (PRO-2048), 20-430 (PRO-2050), 20-512 (PRO-67), and 20-520 (PRO-90), along with all future service manuals within the stated criteria. To the extent that service manuals exist and are in stock, schematics (service manuals) for scanners that can receive 800 MHz or above that were submitted for FCC certification before May, 1997 will continue to be available to customers and others. To the extent that service manuals exist and are in stock, schematics (service manuals) for scanners that cannot receive 800 MHz or above will continue to be available to customers and others. Modified scanners (regardless of frequency or date of manufacture) will not be serviced by RadioShack. These scanners will be returned to the customer with a notice indicating that the unit appears to have been modified and if the scanner is returned to its original specifications, RadioShack will use reasonable efforts to repair it. To the extent that scanner parts are available and in stock, scanner replacement parts will continue to be available regardless of the scanner's frequency range or date of manufacture. |
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: Why do I get constant noise on a particular channel? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: It may
be a birdie channel. Birdies are frequencies your scanner uses when it operates. The most
common birdies to watch for are listed below.
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: When I plug a speaker into the earphone jack, the audio volume cuts down a lot & I have to turn the volume up - is this normal? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: To connect to an earphone jack requires an amplified extension speaker; if your speaker is not amplified, you get significantly lower volume as you describe. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: My scanner will accept 821.2620 but then rounds it off to 821.250 (for example)? Why can't I enter the correct frequency? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: The scanner frequencies must correspond to the preprogrammed step rate; this is normal operation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: I tried charging NiMH batteries in my scanner & the batteries appear to be getting very hot/expanding/etc. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: NiMH batteries require a different charging circuit from NiCd. You should never charge NiMH batteries in any device or charger unless it clearly specifies that it will charge NiMH batteries. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: I put new batteries in my scanner but it shuts off after a few seconds. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Clean the battery contacts using a rubber eraser. If the problem continues, try different batteries. If the problem still continues, you would need to have the radio serviced. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Troubleshooting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: My scanner stops on a particular channel or frequency when using the DC adapter and the engine is running; it works fine when the engine is not running. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Something in the engine is generating RF interference. You would need to determine where this is coming from and install a filter. The best place to start is with a noise filter on the DC line, such as: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: What scanner antenna should I use? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: The
antenna which will be best for you will depend on what type of scanner you have and the
signal strengths. The table below lists our range of antennas available. Antenna Details
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: How can I record my scanner's broadcasts? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: You
would need to connect the headphone output jack to a tape player using the 274-889 1/8" Mono Plug
to Two RCA Jacks Adapter and RCA A/V Patch Cables. Good (two nickel-plated RCA Plugs on each end)
Better (RCA Plugs with gold-plated contacts, two straight on one end, two right-angle on the other)
Best (Gold-plated RCA Plugs on each end) |
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: I am going out of the country; will my scanner work and do you have frequency lists for (country)? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer:
RadioShack products sold in the US are not intended for use and may not function properly
outside of the US due to power and other issues. Additionally, your radio scanner may be illegal to use in your destination. We cannot recommend using a US scanner outside of the United States and strongly suggest that you contact a reliable source of information (travel agency, government body) to determine the legality of this use. We do not have a source for frequency lists outside the United States. |
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: Do you sell a scanner to pick up cellular or cordless telephone frequencies? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: No! It is illegal to use a scanner for this purpose, and RadioShack scanners are designed to be unable to do this. The legal issues are covered under the Electronics Communications Privacy Act of 1996 as amended under Section 2511. This information can be found at the local public library under US Code 2511. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: How do I use stereo headphones with my scanner? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: You need a mono to stereo adapter such as 274-368 (nickel-plated) or 274-882 (gold-plated to minimize signal loss). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: Can I use an external CB antenna with my scanner? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: CB antennas are optimized for the low end of the spectrum; CB frequencies are 26-28 MHz. While it may work, your reception in the higher frequencies would not be equivalent to what you would get with a scanner antenna. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: What kind of cable should I use to connect an outside antenna to my scanner? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: You need
to use 50-Ohm cable, such as either RG-58, RG-59, RG-8 or RG-8M. For cable lengths greater
than 80', you should use RG-8 to counteract signal loss. We sell the following cables:
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Product: Usage | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Question: What is the range in miles? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Range for a scanner cannot be specified, as it depends on the level of interference and the transmitter strength, which can vary widely. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Product: Extension Speaker | Cat. No.: 200-0009 |
Question: Do you carry a speaker adapter from 1/8" to 3/32"? | |
Answer: Yes, it is available as Cat. No. 274-0327. | |
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Product: Scanner On-Glass Antenna Kit | Cat. No.: 200-0011 |
Question: Will this work on tinted windows? | |
Answer: No. | |
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Product: Scanner On-Glass Antenna Kit | Cat. No.: 200-0011 |
Question: Can I use this to transmit? | |
Answer: No. | |
Back to Index | Back to Top of Section 2 |
Product: Base Scanner Antenna | Cat. No.: 200-0013 |
Question: Is there a replacement? | |
Answer: Yes, it is available as Cat. No. 200-0043. | |
Back to Index | Back to Top of Section 2 |
Product: Rubber Duckie Antenna | Cat. No.: 200-0034 |
Question: What is the frequency coverage and length? | |
Answer: The
frequencies are given below: Receive Only
Receive/Transmit
Length: 240 mm |
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Product: Scanner Antenna (30 MHz to 1300 MHz) | Cat. No.: 200-0042 |
Question: What connector do I use to connect this to a scanner? | |
Answer: The
connector for this antenna is an F jack. There are two methods for connecting it to a
scanner:
To construct the cable in the second option, you would need the following:
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Product: Scanner Antenna (30 MHz to 1300 MHz) | Cat. No.: 200-0042 |
Question: What is this made of? | |
Answer: The antenna is made out of aluminum. | |
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Product: Discone Scanner / Ham Base Station Antenna | Cat. No.: 200-0043 |
Question: Is this directional? | |
Answer: No, it is omnidirectional. | |
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Product: Discone Scanner / Ham Base Station Antenna | Cat. No.: 200-0043 |
Question: What is the length and diameter of the lower 8 rods? | |
Answer: The diameter is 0.190"; the length is 31.875". | |
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Product: Discone Scanner / Ham Base Station Antenna | Cat. No.: 200-0043 |
Question: What are the frequencies of the bottom radials? | |
Answer: What is being referred to as "radials" are the radiating (or center) elements. In a discone antenna, the horizontal elements are connected to the shield and the cone is connected to the coax center conductor. The actual configuration is an upside down half-bow-tie. It is the width of the cone ( vs. the cone's length ) that gives this antenna its broad band performance (the discone is 30 - 1300 MHz; the vertical whip is resonant in the 10M ham and 11M CB bands, for total 25 - 1300 MHz performance). | |
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Product: UHF/VHF Base Antenna | Cat. No.: 200-0176 |
Question: How is it mounted and does it come with cable? | |
Answer: You can use other mast mounts to mount this; it uses U bolts. It does not include cable. | |
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Product: 9-Volt Scanner Adapter | Cat. No.: 200-0188 |
Question: What replaces this adapter? | |
Answer: This was a 9V, 300 mA (minimum) adapter with a 1.3 mm / 3.4 mm plug. The 273-1810 DC/DC adapter meets these requirements and includes the correct plug. The 273-1767 AC/DC adapter meets these requirements and comes with your choice of one free adaptaplug. You will need the "H" size adaptaplug, Cat. No. 273-1711. | |
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Product: Headphones with Earpad | Cat. No.: 200-0282 |
Question: How much noise do these block out? | |
Answer: These use passive noise reduction and are not rated in dB. | |
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Product: Headphones with Earpad | Cat. No.: 200-0282 |
Question: What is the sensitivity (dB rating)? | |
Answer: Sensitivity = 100dB +/- 5dB @ 1khz | |
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Product: Koss Speedzone Headset | Cat. No.: 200-0284 |
Question: How much noise do these block out and what is it designed for? | |
Answer: These use passive noise reduction and are not rated in dB. They are ideal for hand-held race scanners. | |
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Product: Koss Speedzone Headset | Cat. No.: 200-0284 |
Question: What are the specifications on these headphones? | |
Answer: The
headphones are rated at:
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Copyright© RadioShack Corporation 2001. All rights reserved.