#KENWOOD TK 880 SPECIFICATIONS SERIES WITH R221#
#KENWOOD TK 880 SPECIFICATIONS DOWNLOAD KENWOOD RADIO#

I had no problem programming the CT-780, but I have issues with the CT-880.Kenwood TK-840 UHF Mobile Radio Rating 7/10 Buy one now here.

Kenwood tk-880 specs Hello to everyone, I hope I can get some information on this issue. Ive been all over the place with no real answer. I bought a Kenwood CT-780 and 880 (version 1.50am) for use on the amateur radios.

The RT Systems interface makes updating your Kenwood handheld radio software quick, easy and safe. What kind of radio system does kenwood make?TK-880/H 5. INSTALLATION PLANNING CONTROL STATIONS 5-1.

Kenwood Tk 880 Specifications Download Kenwood Radio

Your KENWOOD dealer can help you select an antenna sys-tem that will KENWOOD is deploying digital radio communications systems with high reliability and functionality, which were developed by leveraging its long-standing technologies and know-how in communications and audio around the world. What kind of radio does kenwood tk 7160 have?KENWOOD TK-7160 VHF Conventional Mobile Radio, 136-174 MHz, 50W, 128 Channels, 8 Character Display, 9 Programmable Function Keys, Front Panel Speaker, Voice Inversion Scrambler Built-in, Ignition Sense, QT / DQT, DTMF Encode / Decode. Is the kenwood tk 880 tied into dc power?Well, I haven't gotten far. TK-880 is tied into DC power and, when turned on, shows a very quick version # then UNPROGRAM. From the internet, I tried to change it to PROG mode by turning on with SCN button depressed no change. We make it easy to download Kenwood radio software directly to your device and update your radios to the newest versions in minutes.

DistortionDid increase at higher signal levels, but not alarmingly. THD for some tuners can exceed 1% for weak signals. WhenI reduced the RF level, the noise floor simply rose and covered the distortionProducts. After alignment, 1 kHz stereo THD for both was just 0.02%. Before adjusting anything, neither tuner had any harmonicsAbove в€’70 dB. The first surprise was how low their distortion wasOut of the box.

WithNonidentical filters the poles are no longer coincident and the group delay has aChance to spread out. When you cascade two identicalFilters, group-delay variation doubles because the poles coincide. One is an MX and theOther an MP3, both low-group-delay types. But while the ratedBandwidth of each is 250 kHz, the filters are of different type. Like many tuners theKT-880D uses two ceramic filters in wide IF mode.

RF overload performance was similar to that of the Pioneer F-90, which sports a balanced mixer. I had to turn my antenna toward a 14.5 kW station 2.4 miles away to find any IMD (the resulting signal was huge: 123 dBf, about 400 mV at the antenna terminals). While not bulletproof, the front-end resists overload well. These micro-X devices, with a noise figure of just 1.2 dB at 200 MHz, likely account for the tuner's sensitivity.

It drives passive ultrasonic filters. The unadjusted nulls were at 113.2 and 187.0 kHz.The LA3401 stereo decoder uses a ceramic resonator and requires no VCO adjustment. The low-frequency roll-off is due to the spectrum analyzer.

When tuned more than 50 kHz low, red bars to theLeft respond. When correctly tuned, five white bars in a vertical columnIndicate signal strength. Another awkwardness isThat a single button controls both stereo/mono and automatic/manual tuning.The fluorescent display has an interesting way of showing tuning along withSignal strength. Recalling a completeReceiving state may require pushing up to four buttons. The memories saveNeither the IF bandwidth nor the stereo/mono mode. There is no output buffer following the filters.The KT-880D has twenty memories in two groups of ten.

I replaced the single 150 with a pair of 110 kHz filters and an IF amplifier. But adjacent-channel selectivity measured only 17 dB. According to Kenwood, this improves alternate-channel selectivity from 60 to 90 dB.

Kenwood Tk 880 Specifications Series With R221

The meter segments then illuminated at 17, 37, 48, 66, and 77 dBf, a wide and useful range. I added 33kО© in series with R221 in one tuner. However, the signal-strength indicator seemed too sensitive.

Perhaps the intent is to illuminate the stereo indicator as soon as possible, just a few dB above the mono 50 dB quieting point. A Yamaha T-1020 did something similar. It's odd that the blend is so aggressive, happens well below the level where stereo noise becomes objectionable, and functions over an RF signal level range of only 4 dB. At 18 dBf the stereo decoder switches to mono. When a stereo signal drops to about 22 dBf, the tuner strongly blends the left and right channels, leaving only a few dB of separation.

The PCB traces are exposed and I got bit a couple times while working on the tuner. It took about an hour of disassembly, drilling, and filing to replace the jack with an F-connector.The AC line connects to a PCB mounted upside-down on the power transformer. It accepts a push-on F-connector, but a push-on adapter requires additional rear clearance. This 24kО© resistor is just to the rear of the center slug in the postdetection filter.The rear panel has a European-style Belling-Lee antenna jack. Shorting R76 disables the blend entirely. It is easy enough to alter the threshold and separation by changing R73 and R104.

They don't mention L5, the mixer output transformer. I experimentally illuminatedREC CAL and can just make out MAIN, SUB, and even BILINGUAL! You might use one of these to indicate that theThe alignment instructions in the service manual are incomplete. There are spare inverter, flip-flop,Op-amp, fluorescent driver, and display sections.

Allowing theVaractor voltage to go to 25 V at 108 MHz increased sensitivity in oneUnit. The tuned-circuit capacitances aren't adjustable so I checked theTracking at 90 and 106 MHz using the LA1235 signal-meter output. I saw no change in varactor tuning voltage when I pried off theCover to gain access, so I didn't bother to drill new holes.Front-end alignment is supposed to be done by first adjusting the localOscillator for a tuning voltage of 3.0 V at 87.5 MHz and 23.0 V at 108 MHz.Then you are supposed to peak the slugs in the three RF coils for maximum at 98MHz. The inductor andCapacitor are adjustable, but the access holes in the shield cover wereMispunched in both tuners and didn't come close to lining up with theAdjustments. The adjustablePostdetection filter L18 and ultrasonic filters L19 aren't mentioned, but myFilters were so accurately aligned that I think you can ignore them.The local oscillator is in a shielded compartment. The instructions also neglect L8, which has an adjustable core,But tweaking it had absolutely no effect on anything.

The tuner had two 110 kHz filters installed in narrow.50 dB quieting sensitivity, mono W 16.5 dBf, N 17.9 dBf50 dB quieting sensitivity, stereo W 38.8 dBf, N 37.4 dBfStereo separation, 1 kHz W 53 dB, N 21 dBCapture ratio, stereo, 30 dB W 13.5 dB, N 12.5 dBCapture ratio, stereo, 50 dB W 33.5 dB, N 32.5 dBRF intermod W 86 dBf (97.7 + 98.5 в‡’ 96.9)Minimum stereo pilot injection W 2.8%, N 3.0%The sensitivity of my tuner varied with temperature. I used the test equipment listed here. Tuning 100 kHz off frequency over most of the FM band degraded the return loss, implying that the varactor drive to the RF input circuit was just about right.For the following FM measurements I used IEEE 185-1975, updated as described here. Pick up the signal at D43, where the adjacent components carryFront-end return loss measured about 15 dB, equivalent to an input SWR of1.43 and a mismatch loss of just 0.14 dB. I blew the IC drive circuit in one tuner with sloppyProbe handling.

It was 15.0 dBf on a cold morning when I made the noise figure measurement. Mono wide sensitivity went to 17.0 dBf with the cover in place.