The receiver ic, a tk10930, is a vsop very small outline package ic. Therefore, it is necessary to tap the wider baseband audio directly at the output. After the discriminator, audio filters and amplifiers follow that may heavily distort a digital signal. Whistler ws1088 digital handheld ez scanner scanner master. Mobile 12 volt charger for uniden bearcat scanners bc60xlt1 bc70xlt bc80xlt bc120xlt bc220xlt bc230xlt bc235xlt bc245xlt.
Programming uniden scanners using freescan software. Also see the scandata faq q2 article for a list of older scanners tap. Find scanner discriminator taps related suppliers, manufacturers, products and specifications on globalspec a trusted source of scanner discriminator taps information. If i plug a set of headphones into the discriminator tap, am i supposed. Only a few scannershave a discriminator output as a standard feature. Digital speech decoder is an open source software package that decodes. An overview of trunked radio systems by black axe in the past few. Just added a discriminator tap on this classic pro37 scanner radio and works fine with lapd p25 simi valley p25 disneyland shuttle. The bc235xlt was introduced in the mid 1990s and was the first. This excellent software can be downloaded free of charge. The radio will essentially never go obsolete, since it is computer controlled, and new features might always be added by software updates. Realistic radio shack pro37 scanner with discriminator. I have found many articles which show photos and talk about various resistors, capasitors, etc.
Others can follow this guide but will have to make allowances for the type of scanner used which will provide the feed of the control channel data stream. Decoding p25 phase 1 with rtl sdr and sdrsharp full walk through duration. Radio shack realistic pro2006 analog scanner with discriminator tap and led smeter duration. In order to use the discriminator feature you must use a pc with the proper software. Digital speech decoder software package the radioreference. Predefined service search ranges make it easy to find activity in your area. Tune to a desired signal and run the decoder software of your choice. Link did the same thing but used a normal capacitor.
Connection to a computer is optional and requires additional software, not provided. The windows audio playback and recording panels are useful too. Digital radio voice communications are becoming more commonly used in the radio spectrum. It also provided a data source usable with software programs such as. You can carefully solder a wire if you prefer, but it is more likely to void the warranty. About icom icr20 discriminator mod the resource is currently listed in in a single category. How to upgrade the firmware on a uniden bct8 scanner and reband a motorola and edacs trunk system.
Could you tell me what radio shack parts along with the part number that are needed to build a discriminator tap for my pro106 scanner. Voice traffic will be heard on the receivers speaker or headphone jack not your computer speakers. The discriminator output is available between the middle ring and ground. I just modded my bc235xlt to have a discriminator output, and i am having problems trying to find out if i did it right. Realistic radio shack pro37 scanner with discriminator tap p25. Bct15 discriminator output modification description. Mobile 12 volt charger for uniden bearcat scanners. Unzip the contents to a temporary location then doubleclick setup. Do you want a simple scanner or a doall traditional scanner. The icom pcr100 is an amazing radio, even years after it has been discontinued. Radio shack pro2035 scanner with discriminator tap. View and download uniden bc 235xlt user manual online.
Please see the talk page for comments about this tap procedure. Radioshack pro2035 w discriminator tap for p25 nxdn dmr. Uk radio scanning forum view topic discriminator tap. An audio cable from the discriminator output to the line or microphone input of your computers soundcard. I have bent to follow pin 9, so that only a minimal amount of solder is needed. Pro2006 p25 decoding with a descriminator tap youtube. I just did the bc895xlt discriminator mod and it works. If errors are encountered while using the program, please use the helpalerts and errors menu from within the application. Tapped the discriminator of a pro2006 scanner and piped that into the computer so i could decode the data into clear audiovoice. Uniden bc235xlt direct tap, imic mic port, imic, onboard audio.
People are tapping the discriminator at pin 9 of ic3 and this is apparently incorrect. As such, the headphone signal is available between the tip and ground. Look at the center of the board, go right and down. Its just above the serial of the radio by the ext speaker. For those hobbyists who cant justify the high price tag of those scanners to listen in to dmr, there are other alternatives. Only a few scanners have a discriminator output as a standard. This is a low level signal voltage only, no current available, thus no power available containing both a dc and an ac component. There is a lot of documentation on how to add a discriminator tap to various models.
Uniden bearcat 245xlt trunktracker scanner bc245xlt. Discriminator tap point greg knox jpeg of discrim tap point. Uniden bearcat ubc780xlt when you remove the top cover of the scanner, the point with the unfiltered baseband signal becomes visible. Its shown in the picture below where i attached the blue wire.
If i plug a set of headphones into the discriminator tap. With the right software, you can plot the positions of ships received on a map. Hi folks, ive repurposed an old bcd250 and added a disc tap for use with dsd. View and download uniden bc895xlt user manual online. Did anyone modified the radio shack pro90 scanner with discriminator tap before. A limiting resistor of 10 k is connected to pin 9 of the mc3361. The bcd996 and bct15 appear to share the same tap point location. Just added a discriminator tap on this classic pro37 scanner radio and works fine with lapd p25 simi valley p25 disneyland shuttle dmr and other digital finds. Therefore, it is necessary to tap the baseband audio directly at the output of the. They can be directed by the software to a voice channel. True, simple may be relevant to your experience with scanners but there is now a class of scanners made for the novice enthusiast that allows you to just select the systems you want to scan, or enter a zip code and have the scanner find them, without having to worry about trunking, fleetmaps, talkgroups, sites, etc. By taking audio from the correct point in the receiver, the audio is in a much cleaner form, making it ideal for decoding pager tones. The main category is icom icr20 wideband receiver that is about icom icr20 radio receiver. The discriminator output from a scanner is the raw, unfiltered signal that a scanner produces before it is sent to the audio stage for output through the speaker.
If your receiver also has a discriminator tap, it can operate in a signal role. Put a discriminator tap into my bearcat 15 scanner for deocoding data such as pagers. The pcr has a discriminator tap and dsd works okay, although i have to use a virtual audio cable to route the discriminator audio to dsd. The rtlsdr software defined radio combined with sdrsharp and a program called digital speech decoder dsd can be used as a radio scanner to easily and cheaply listen to unencrypted digital radio voice conversations. I did it based on the instructions at discriminator.
If you want to decode and monitor digital fsk and psk systems seriously, a discriminator tap is an absolute prerequisite. According to a web page i found, this is not the right place to get at the true discriminator. Channels limited only by your hard drive space, decent control software, and a. A builtin discriminator output provides raw discriminator signal to third party signal decoding software without risky hardware modifications. The discriminator output from a scanner is the raw, unfiltered signal that a. To make a discriminator output on a uniden bearcat 780xlt, there is no need to solder to an ic. For example, a lot of people use a discriminator tap on their scanner with dsd software to listen to digital modes, if just the regular audio headphone out socket is used the decode will be garbled as the program is not getting all the data, but with a discriminator tap it gets the raw audio and can be decoded properly.
I just did a discriminator mod on the bc895xlt using the correct point for the tap. Ive gotten a radio shack pro90 scanner and i learned that i need to modify my scanner with a discriminator tap for my atcs software. This is connected to pin 9 of the 3361 chip which is the discriminator output. Get support for your uniden bct8 scanner at uniden customer support. Use a terminal connector to connect the wire to tp4. I watch the oscilloscope display to make sure that dsd is hearing something.
Table 1 shows a list of scanners, the discriminator chips used in the scanner, circuit. This link is listed in our web site directory since wednesday dec 2 2015, and till today icom icr20 discriminator mod has been followed for a total of 497 times. A discriminator tap is simply a tap on the audio circuit before the audio signal is shaped and modified by the toneamplifier circuits and speaker. One receiver had a discriminator tap and fed the control channel data stream. Said discriminator tap should have a resistor inline. Beginners quick guide the basics of dmr digital mobile. The realistic pro26 is quite a challenging scanner to equip with a discriminator output. The tap is connected to an external socket mounted on the radio. Unidenbearcat bc235xlt, handheld vhfuhf scanner receiver.
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