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TX between 26-33MHz, 47-54MHz, 134*-174MHz and 400-480MHz. 26-33MHz RX/TX and AM RX 47-54MHz RX/TX and AM RX 108-136MHz AM RX 136*-174MHz RX/TX 320-399MHz RX 400-480MHz RX/TX 750-950MHz RX<nowiki>*</nowiki>. ''inconsistent requires further testing.''[[Image:35star.png]] [[Image:30star.png]] This is similar to the [[Yaesu FT-8900R]]. Although it lacks some of the refinement of the Yaesu, the Tytera model does allow you to receive AM modulation. The Yaesu requires modification for extended coverage while the Tytera does it out of the box.This is similar to the Yaesu FT-8900. The speaker is in the main body and not the detachable control head. The left side has all four bands while the right is 2m and 70cm only. It also will receive from additional frequencies outside of the listed transmit range. Single antenna port. Sensitivity on the receiver is very good.The speaker is in the main body and not the detachable control head. The left side has all four bands while the right is 2m and 70cm only. It also will receive from additional frequencies outside of the listed transmit range. Single antenna port. Sensitivity on the receiver is very good.Protection of the final stage amplification transistor is present in this radio, but inadequate. Antenna failure during rain resulting in high SWR caused the Amplification MOSFET to fail in the radio. The replacement part costs around $30 - $40 and can be replaced, with care, and good desoldering and soldering technique. This radio uses the same final amplifier transistor as does the Yaesu FT-8900R.The PA stage gets very hot during transmit. If there is a spike in voltage during transmit then the final (MosFET) will fail. Update: I've had three of these radios in the past three years. One of the radios stopped transmitting correctly as the final amplification stage went out. This was due to an intermittent short in the antenna feed-line that was not apparent, making it not as much the fault of the radio but more the operator. As stated before, protection of the finals seems inadequate. The second unit worked for a couple years then began to drift off frequency. This is likely a fault in the oscillator crystal. The third unit is functional but seldom used. Repair of the first unit is reasonable if you do the work yourself as the radio uses a common Mitsubishi mosfet which can be purchased at a reasonable cost (under $100). You will need a good solder vacuum pump. The unit with the frequency drift problem will not be repaired as the work would exceed the value of the radio. You should consider these a somewhat expensive disposable radio as you will likely not be able to find a service shop willing to work on these or most other Chinese transceivers.A: Yes, but don't do this, it is illegal. You will die.A: No. ''See section below on AM Transmit for details.''==firmware variants==Menu option #35 is the cross band repeat option. Later version is known as the "Plus" model which has an updated firmware that fixes known issues and user complaints.#Tune the left (primary) to the repeater or frequency you need to communicate with#Tune the right to the simplex frequency of your HT or portable remote#Press the [.] button to access program menu#Select option #35 X-RPT#Press knob (upper left) to select, observe menu display now says "XSTART" To exit cross band repeat mode simply press [.] menu button. While in cross band repeat mode you will not be able to change the frequency. ===toggle single or dual receive===If you short-press the volume knob on the left side (side A) you will toggle between single receive and dual receive. When in single receive the B side of the radio will display the operating voltage.''Anyone else get sick of stupid Youtube videos? Are young people too stupid to read these days? All they can do is sit and watch a video on how to do things. I like to read it in writing. So I am going to write up some reading for you to read when you want to program your rig. ''''Anyone else get sick of stupid Youtube videos? I like to read it in print. So I am going to write up some reading for you to read when you want to program your rig. ''You should know that this radio programs much the same as the Yaesu FT-8900. If you get suck looking for information, you can search under Yaesu FT-8900 to find most answers regarding programming that apply to this radio as well.You should know that this radio programs much the same as the Yaesu FT-8900. If you become frustrated while looking for information, you can search under Yaesu FT-8900 to find most answers regarding programming that apply to this radio as well.CTCSS / PL ToneThe programming menu can be activated by a short press of the MENU button. *CTCSS can be enabled for transmit, or both (tone squelch on receive) by going to MENU item #31 (Tone M). ie Tone Mode*CTCSS frequency is set by going to MENU item #30 (Tone F). ie Tone FrequencyWhen the tone mode and frequency are set after you select the frequency you want to add to memory, you can save following the procedure "SAVE TO MEMORY"REPEATER OFFSET OR SIMPLEXThis transceiver has auto repeater offset shift. It can be enabled via MENU item #2 (ARS). You can also manually set the repeater offset which can be useful for repeaters using reverse offset or simplex.To manually set the repeater offset use menu item #24 (RPT.MOD). * Select menu #24 (RPT.MOD) and set to offset shift direction (off, +, -)* Select menu #27 (SHIFT) and select frequency shiftSAVE TO MEMORYThe faceplate / remote head unit uses a RJ-12 6-wire modulat connectionRJ12 6 Conductoruse: 6pin Rj12 Moble Radio Font Case Extend Cable, RJ12 (6P6C) Make sure you use "straight" wired and not "reverse" wired. The reverse wired will not work and may damage the radio.===Reset===With the radio off, Hold down the LOW button on the left side while pressing the power button on the right. This enters rest options when the radio turns on. There are several reset options.===Final Amplification Transistor===This radio uses the same final amplifier transistor as does the Yaesu FT-8900R, which is the [[RD70HVF1 MOSFET Power Transistor]] made by Mitsubishi.===Power Output===Actual bench test results,2 METER 146MHz FM (into resonant antenna) Low ... 8w Mid2 .. 13w Mid1 .. 28w High .. 58w2 METER 146MHz FM (into dummy load) Low ... 7w Mid2 .. 10w Mid1 .. 22w High .. 49w 70cm 435MHz FM (into dummy load) Low ... 5w Mid2 .. 9w Mid1 .. 17w High .. 32w6 METER FM (into dummy load) Low ... Mid2 .. Mid1 .. High .. 10 METER AM (into dummy load) Low ... Mid2 .. Mid1 .. High ..==Does the Tytera / TYT TH-9800 talk AM?==short answer: NoSome initial reports found online indicated this radio could transmit in AM (Amplitude Modulation) as well as receive AM. I have recently acquired a TH-9800 that, although receives AM when the mode is set in the menu, still transmit in FM. There are some variations of the Quad Band TYT TH-9800 being sold. There is a "Plus" model that is supposed to have updated improved firmware. Reports of the Plus model being able to transmit AM (Amplitude Modulation) have been made. I am sceptical and so are my colleagues. We have acquired three different TYT TH-9800 transceivers, one being designated "Plus" by a red sticker on the unit.We will use a spectrum analyzer and determine if any of the three units will transmit AM and report the results here.* Use spectrum analyzer to view transmit* Study circuit to see if exciter and finals are capable. Tytera does not provide a schematic diagram.<big>No Tytera TYT TH-9800 will transmit in AM. The internal circuitry to transmit with amplitude modulation does not exist within the radio.</big>An example of the false claim made by someone using the Internet moniker "Izzyandsue" can be found here: * https://forum.ih8mud.com/threads/cb-and-quad-band-all-in-1-ham-radio-is-this-true.959057/page-2Again, no model of TYT TH-9800 will transmit with amplitude modulation, although they will receive AM. If a "trucker" can hear you as Izzyandsue claims, it would be very distorted or they are using a multi-mode radio that can operate in FM.==Plus Model==Later version is known as the "Plus" model or '''Mk II Version''' which has an updated firmware that fixes known issues and user complaints.The Upgraded Plus model became available when several complaints were made about annoying bugs in the radio. An [http://forums.qrz.com/index.php?threads/tyh-th9800.471351/ online source] reports that it has a different board than the previous model. We will take pictures of both and post them here.Purported Improvements:* Loud scan beep issue resolved: active freq caused max volume beep * One VFO scanning causes receive audio on other VFO to cut in and out resolved* Squelch problems resolved: second vfo squelch would sometimes stay open required power cycleTHIS WIKI PAGE CREATED AND MAINTAINED BY [http://www.ke0etz.com Ke0etZ]THIS WIKI PAGE CREATED AND MAINTAINED BY [http://www.w0dbw.com WØDBW]