ft-225rd manual

ft-225rd manual

Please do not offer the downloaded file for sell only use it for personal usage. Looking for other manual? For this no need registration. May be help you to repair. You could suffer a fatal electrical shock. Instead, contact your nearest service center. Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition, Also some files are djvu so you need djvu viewer to open them. These free programs can be found on this page: needed progs If you use opera you have to disable opera turbo function to download file. If you cannot download this file, try it with CHROME or FIREFOX browser. Translate this page: Relevant OTHER forum topics: Yaesu FTL7002 UHF ado-vevo Sziasztok! Tudna valaki segiteni Yaesu FTL-7002 tip. URH ado-vevo mukodesi tartomanyanak a boviteseban. Nem talalok anyagot hozza.Most 450-490Mhz kozott mukodik, de nekem 430-450Mhz-ig kellene. Ha tud valaki segiteni megkoszonom. Udv:pandora yaesu FYG-3u hasznalata sziasztok.CsabaYou can write in English language into the forum (not only in Hungarian). Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now Save Save Instruction Manual for Yaesu FT-225RD For Later 0 ratings 0% found this document useful (0 votes) 33 views 50 pages Instruction Manual for Yaesu FT-225RD Uploaded by Misa Stevanovic Description: a Full description Save Save Instruction Manual for Yaesu FT-225RD For Later 0% 0% found this document useful, Mark this document as useful 0% 0% found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 50 Search inside document Browse Books Site Directory Site Language: English Change Language English Change Language. Yaesu ft 225rd sm service manual 1st page. Second hand yaesu ft 225rd vhf mui mode transceiver fitted with mutek.http://emspremium.com/upload/editor/fujifilm-jv300-digital-camera-manual.xml

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Apr 14, 2014 -View and Download Yaesu FT-225RD instruction manual online.Login here Join thousand of instructors and earn money hassle free. Get Started Now. By continuing to use the forum you conform your acceptance of these. If you are not happy to accept these you must stop using the forum and delete our cookies from your browser. Private buyers only - no traders. No swaps. Full circuit available at. FrankA friend has the service manual for the FT221 which gives voltages expected plus test points for various items of test gear. Peter. Enjoy digital display to 100 kHz. The Yaesu FT-225R is a similar analog version at a lower price. The Yaesu FT-625RD is similar to the FT-225RD, with the same power output, but operates on 6 meters instead of 2 meters. Tell us something about it! We collect prices paid by real hams over the years to help you estimate the value of a used Yaesu FT-225RD. Just bought or sold this model. Let us know what you traded it for and help other ham operators! If you have any questions or suggestions, or if you'd like to participate, please get in touch. Modifications to the FT225RD It is a bit more difficult to reduce theTo cure the VCO you need some experience above novice level.Here we discuss the follower FT225RD and explain not only how toThe noise before and after modifications is shown in fig 1. The figure also shows average values from the modified rigsIC202 which uses a VXO is alsoAs a comparision some other rigs are also shown in the figureThe comparision curves (with unreadable text at the right side). Note that FT225 is the most noisy station before modificationsThe sideband noise is identical between the two units in transmitThe performance of the two FT225RD units differs considerablyThe 2-signal dynamic range is shown in fig 2.Curve A shows the performance in the original state. B shows a modified station. C and C' show another station before andIt must be amplitude or phase modulation introduced by later stages.http://biofiat.com/images/fck_images/fujifilm-jx220-manual.xml

The contribution to the tx noise that comes from the VCO is indicatedOne of the stations, B in fig.2 has extremely low VCO noise. Very probably the wide band tx noise can be reduced by 15dBThe modification required to reduce the sideband noise is. The error in the VCO is the usual one, the capacitance diodeThe resistor creates noise that modulates the VCO signal. This FM modulation is the noise sidebands.Some skill in desoldering is required.The pins are not well secured to the VCO board, and they areVCO board.R1001 is located between TC1001 and the two capacitance diodes. It is very important that the choke is mechanically well attachedVibrations cause FM modulation which the (after modifications) slow. PLL will not cope with. You may solder the grounded end to the ground plate on the top side ofWe have received several letters with questions about what inductor. Below is some more information about what the rf choke and itsIt is valid for PLL loops in all transceivers, not only at VHF.The choke forms a low pass filter with the capacitance diodes andThis low pass filter has to produce a small phase shift at the highestPractically a 3dB point of 5kHz may be ok which means that the chokeIn other words, there is no upper limit for the inductance.The important thing is that it does not degrade the Q. At VHF a single layer inductor wound on a ferrite rod combinesIt does not change the resonant frequency much either.They are wound by about 30 turns on a 12mm long ferrite rodThe inductance is about 10 microhenry.http://xmirohr.eklablog.com/acer-pd-120-service-manual-a203597270

In other words, make sure the glue layer is thick or use someThe other components are conveniently placed on the back side of theIf the frequency has to be adjusted, change TC1001 until the voltageWe have done some experiments in order to further lower the sidebandThis was sucessful in one of the units while the oscillatorConsequently the unit C in fig 2 has only the modificationsWe decided that this improvement is insignificant and did not try toAfterwords we have found that the sideband noise of the VCO itself does notIt is therefore possible that changing these capacitors improves theThis shows that part of the VCO noise comes from the voltageIt should be possible to get another 5 dB or more at 10kHzIn order to avoid excessive lock times the resistor should beThere may be some complications which we will not discuss here.It is uncertain whether it is possible to devise a reproducibleWe think it may be valuable to make the mods available already nowConsider this information when you decide what rig to buy,If you use the FT225 in original shape you will cause interferenceThis series of articles is inspired by the large scale testBesides excessive sideband noise we found that some stationsWe also found that the bandwidth of the ssb transmit signalIn the large scale test FT225RD was the worst rig in ssb modeIt also has severe keying clicks, so this station is a goodIt is quite simple to make the keying perfect in FT225RD. In the keying circuitry there is a pulse shaper, Q1201. It is followed by a low pass filter R1204 and C1211. C1211 is loaded by R1205 which goes to the base of the keyingThe rise time is shorter.http://theuhasvifa.eklablog.com/acer-pc-manual-a203597272

In one of the rigs we adjusted it by connecting a 27 kiloohmThe signal from the collector of the keying transistor isFirstly it goes to the emitters of two of the transmitSecondly it goes to the source of Q510, a power regulatingThe voltage swing required to control Q510 is much smallerWithout this voltage divider one gets dual time constants in theThe resistors are placed on the connector J22 (mic amp unit PCB connector). See the photo, fig 4. Note that the numbering on the connector does not agree withB6 is numbered 12.)The rise and fall times of 2 milliseconds should allow aroundWe will come back to that in a later article.A resistor may be connected in parallel to C1211 on theThat resistor and R1204 determine the rise time, see the text. The fall time is determined by C1211 and R1205.The simple and cheap modifications we have described sofar in thisThis way of curing ssb splatter is however not entirely uncontroversialFor that reason here is first a short general discussion about ssb.With normal speech input, the ratio between peak and average power is atThe average power measured by a 0.25 seconds time constant would stillAssume that the power amplifier saturates at 10W. If such a transmitter is driven entirely linearly the average powerThe peak power will only be transmitted in the peaks of the voice signal. The letter a (my voice) for example gives pulses with a length of 2If one cuts the amplitude to one third (voltage) it is impossible to hearSplatter may of course be produced if the limiting is done improperly.The result is 10 dB better signal strength.

It is quite ok to use harder limiting, but when very hard limiting isMany articles have been written on the advantages of RF clippersUsually these articles show how a sine wave or possibly how twoThat is directly misleading at modest clipping levels becauseAudio clipping is not often used on purpose in amateur transceivers,In FT225 RD the alc circuitry is used to produce a clipping functionThis is very ugly and the reason why this transceiver produces aIf the microphone gain control of a FT225 is set for the instrumentThis gain reduction has to be done to a large extent after the filter,Changing the gain is amplitude modulation. There are no low pass filters in the alc cirquitry so theThe cure for the splatter is to feed the ssb generator withThe amateurs living nearby will however note a dramatic difference.How the speech quality is affected by the clipper can beAs already mentioned, this modification is extremely simple. Move the wire from pin 14A to pin 6A on the PCB connector J22See the phot in fig 4! With the numbering of the schematic diagram the wire should be movedThe average power, i.e. the clipping level is adjusted by. After the modification VR501 will affect both the FM and the SSBAdjust for theThen set VR501 for the power meter to show half that reading when you sayThen follow the step by step description about keying.Finally we want to point out that FT225RD to our knowledge is theIt will also be nessecary to lower the wideband noise in the transmitter. I have been selling on eBay since 2001 - buy with confidence! 73! Shawn KJ7MX Super high amount of views. 9 sold, 9 available. More Super high amount of views. 9 sold, 9 available. You are the light of the world. Please call to place your orders online or select click and collect at the checkout for collections!You’ll then be taken through to our partners Close Brothers to make your finance application.

Like my Yaesu FT-225RD (2m) tranceiver, which is in very goodThat's why i had to use something newer to be able to work the local repeater, which only opens when youI decided to use a CTCSS-module from Relaiszendergroep. Heerenveen, which is in Dutch, but the manual (950k) is in English. Henk VK2GWK inspired me to use this RPT-switch. The nice thing is, that there's a LED going to burn when you switch on the repeater-shift. Henk VK2GWK also made a little design how to use this switch. The thing is, that between the RPT-switch and the LED there a 330 ohm resistor and between the switch and that resistor you have 13.6V. Connect the base You also need a resistor of 15k from base to GND. Pull 13.6V from the power supply to Just behindFollow the yellow wire. Best way to do this, (thanks, Henk PA0HPV, not only for pointing me the right spot but Turn your FT225 upside down, at the right side you'll find slot J21, and solder a wire on pin 9. But. you cannot sodler this wire directly to the. CTCSS-module, you'll need a 47k resistor between it! (The manual of the CTCSS-module mentioned a 100k resistor, but that's a little too much - But before soldering all that.Measure the amplitude while the CTCSS-module is turned Look if it will collapse as soon as you connect it to the CTCSS-module. If so, the 47k resistor needs to be While you are still whistling, the amplitude should rise 20 to 25%. You can That can be done by turning J1102 on the Tone Burst Unit. While L501. If you can't get it right, check the manual for the whole procedure. I didn't use the mute-option of the CTCSS-module, i just turn it on and off with the RPT-switch. Consequence is, that it will keep generating theYou're mike is doing the same, even with a released PTT-switch.Enjoy! Jeroen PA3JT. Learn more - opens in a new window or tab This amount is subject to change until you make payment.

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