drake tr7 owners manual
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drake tr7 owners manualIn this page you find schematic, users and instructions manuals, service manuals, technical supplement, leaf leads and other good stuff. If you have some stuff that not is listed here you can donate this by contact mods.dk. And when you click on the file or icon it will count as a download. If you want to see manuals from other manufactories you can click on the manufactory menu in the left side. You can also click here to see all the manufactories that mods.dk have manuals, schematics or other files from. In order to use this site, your web browser must allow cookies and have javascript enabled. Our cookies contain no personally identifiable information (PII). They are simply a unique serial number used to recognize this unique browser session. By using this site, you aknowledge our privacy statement and agree to accept cookies. Accept Ok Welcome! Thank-you for visiting our online surplus electronic super store. In order to use this site, your web browser must allow cookies and have javascript enabled. Our cookies contain no personally identifiable information (PII). They are simply a unique serial number used to recognize this unique browser session. By using this site, you aknowledge our privacy statement and agree to accept cookies. Accept. It may not display this or other websites correctly. You should upgrade or use an alternative browser. When I close key the relay actuates but their is no 10 volts on the power amp board. I do hve some xtra bds but am looking for any help on the problem. Mny tnx in advance Morry K3DPJWhen I close key the relay actuates but their is no 10 volts on the power amp board. I do hve some xtra bds but am looking for any help on the problem. Mny tnx in advance Morry K3DPJ Click to expand. When I close the key -- the relay actuates -- BUT their is no 10 volts on the power amplifier board. I do have some extra boards, but I am looking for any help on the problem. Many thanks in advance Morry K3DPJ Click to expand.http://www.goldstarautosolutions.com/cmsCart/upload/carrier-programmable-thermostat-with-humidity-control-manual.xml
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Do you have the Owner's and Service Manuals as well as a clean schematic diagram. Do you have the TR-7 Board Extenders? -- Invaluable from proper troubleshooting and repair of this radio. Do you expect to troubleshoot and fix this yourself. Board swapping is not radio repair -- it was a failed attempt in 1980s for consumer based repair. In other words you have some bench experience with radios, but are unfamiliar with this Drake model. This DC inverter circuit included the two board mounted transistors in the center of the board and the small transformer on the right side near the bottom. On the power supply board you will see our old friend Motorola's MC1723CP regulator IC. The 7817 - date code Yes, the same LM723 used in linear power supplies today (look inside your Astron!) The Power Supply Board also contains the voltage divider adjustments for the fixed pass-band tuning control lines. These adjustments are the transceiver mode fixed frequency off-set adjustments that fine-tune the offset to the exact frequency. There are separate frequency adjustments for the AM, RTTY, CW, LSB, and USB modes. w9gbI suspect that Greg nailed it.At 80 yrs old I move slow es not to well at times but the radio is driving me nuts HIHI Wl let U knw Best 73 Morry K3DPJThere is a 6 meg service manual. It is invaluable for working on the TR7. Best is a real copy, next a xerox, then this PDF in my opinion. Make sure you thank the site's owner for being so kind as to post the manual. The service manual gives you a fighting chance to find where to take voltage readings etc. If you really intend to work on your TR7, get a service kit. Basically extender boards W7AVK sells them and they are worth the cost. I had mine for many years before I ever needed them, but it made my repair possible. 73, Ron WD8SBBCount my vote for repair work by Jeff Covelli, simply top quality, integrity and a pleasure to deal with.http://www.timocomputer.cz/files/carrier-oem-manuals.xml FrankAs of last night, my TR7 quit transmitting, too, with the same symptoms as Morry's (normal recieve, relay kicks in). The failure was sudden with no warning. Was Morry's problem on the power supply board or elsewhere. My failure was at about one in the morning, so I took no time to measure voltages, etc., and I'm now at work -- which I must get back to.I have had it happen to me, at least once or twice over the years, a particular function stops, then starts again, with no intervening actions, not even the inevitable knob switching to clean contacts. It has happened with transmit at ZERO, NO output, returned in three days of avoidance. Is that scientific, YES, but not any science you will see listed in a manual, nor taught at tech school. But it IS cheaper than shipping a radio that then has to be unpacked and tested, and repacked and returned. That has happened to me too. FrankRegister for a free QRZ account. It only takes a minute to sign up. When we try to power it up, the (separate) power supply turns on and we have checked with a multi-meter that the radio itself is getting power. But nothing on the face of the receiver comes on. Looking for suggestions on what to test next (and how). Thanks in advance. You might try connecting an antenna to it, and see if you can hear sounds coming out the speaker with the volume and RF gain turned up. But if the digital readout is dark, something else may be wrong Please be sure to answer the question. Provide details and share your research. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations. MathJax reference. To learn more, see our tips on writing great answers. Browse other questions tagged power-supply repair or ask your own question. Something went wrong. View cart for details. Yaesu, Icom, Kenwood, and many other companies build base station gadgets, units for vehicles, and portable products.http://superbia.lgbt/flotaganis/1649293063 Most ham radios are designed with special hardware that can reach high frequencies. What are the design elements for different ham radio options. A base station has a sturdy base that must be placed on a flat surface. These are suitable for both residential or commercial locations. Mobile units for automobiles are compact and are specifically designed for a car or truck cabin. Portable, hand-held gadgets have a convenient strap and are suitable for mobile situations in residential, commercial, or wilderness environments. What are the design specs for a Yaesu FT-857D transceiver. A Yaesu transceiver has VHF, HF, and UHF frequency hardware. This product is built for an automobile and includes convenient SSB, AM, FM, and CW modes. All of the main components that power this radio are manufactured in Japan. In a Yaesu radio transceiver bundle, you get the main transceiver, a mic, a cable, and a mobile bracket. What are the specs for a GD-77 Radioddity radio. The Radioddity GD-77 radio is a portable device that's durable and rugged. On the base, there are options for a VHF and UHF frequency. These devices use a Li-ion battery. The technology that processes frequencies can capture 1024 channels. This portable unit is a practical option for wilderness zones. The LED indicator light can alert you to situations that can gradually drain the battery. The antenna on the base helps the radio generate crisp, bold sounds. What features are included with an ICOM IC-756PRO transceiver. ICOM IC-756PRO transceivers are designed with hardware that produces 100 watts. Many special features that rely on the 100-watt hardware are included with this advanced transceiver such as a voice keyer and a noise blanker component. A built-in antenna tuner helps insure that radio frequencies are always strong when the advanced features are used. Are there advanced ham radio options for automobiles.https://www.acoustiguard.com/images/c60-manual-transmission.pdf TYT TH-9800 Plus transceivers are suitable for advanced situations because they're built with quad-band technology. These units are designed in China, and the technology that powers the frequency hardware can capture 29, 50, 144 and 430MHz frequencies. The frequencies for the FM and AM components have 108-180MHz, 750-950MHz, 320-512MHz, 26-33MHz, and 47-57MHz specs. Sell on eBay Sell Ham Radio Transceivers User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Any help much appreciated. 73,Bill, KC4WNI. Drakelist mailing listAny of you have a TR7 500khz filter that you feel is excess and would Drakelist mailing listAny of you have a TR7 500khz filter that you feel is excess and would Carl WD8NHK. Drakelist mailing listAny body ever seen the darn thing? If the parent board schematic on page 2-5 of the service manual is It would seem like it should beIt's listed on the parts list on page 2-3 an an MR501, which is a pretty heftyIt's amazing how much stuff isLincoln, Nebraska, U.S.S.A. Give a man a URL, and he will learn for an hour; teach him to. Google, and he will learn for a lifetime. HyGain 3750 User's Group - Drakelist mailing listIf the parent board schematic on page 2-5 of the service manual is accurate, itIt would seem like it should beIt's listed on the parts list on page 2-3 an an MR501, which is a pretty heftyIt's amazing how much stuff isLincoln, Nebraska, U.S.S.A. Give a man a URL, and he will learn for an hour; teach him to Google, and he HyGain 3750 User's Group - I am going to swap outaged blue filter foils at my TR7 and RV7 as well. I I am uncertain if just. See the following link for details:Drakelist mailing listI am uncertain if justIt has just the hint of green to look The sample on your web-page is not an This is partially why it looks greenish with age, as well as yellowing Neither of these is Glen Allen, VAKarl du Roi wrote. Good morning. I am going to swap outaged blue filter foils at my TR7 and RV7 as well.https://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1629b47f02b906---countax-mower-repair-manual.pdf II am uncertain if just. See the following link for details:David PiperI am going to swap outaged blue filter foils at my TR7 and RV7 as well. II am uncertain if justSee the following link for details:Drakelist mailing listDrake TR7 transceiver. Is this type of screws installed also on other places Helpful answers to get those screws are highly appreciated. Thanks.Drakelist mailing listI've got further help from www.fastener-express.com I hope that I will get the right items soon, so that screws with apparent wear Thank you again guys.Drakelist mailing listI bought a TR7 last year and started to refurbish the beast - realignment, new. PIN diodes, new displays, etc. Therefore I also need to bring the mechanics of Q: Is there any tutorial or detailed discription which shows how and which BTW: the PTO drive runs a bit noisy and not really smooth, especially if Any helpful info on this matter is highly appreciated.Drakelist mailing listThe module current values are approximate, and the efficiency (also. The results are shown below -- from what I am seeing, the PA looks to be in OK Drakelist mailing listHe parts out TR-7s and Drakelist mailing listFurther, when dummy load. I do have the sevice handbook.Frank. Vk4fusDid I miss something?The server was recently My rational is that in Both of these What about the On 80 meters into a dummy load on CW you should get around 140 watts whenAs you go up in frequency the output will decrease. On 10 meters, youI wouldn't run any tests without a load. The protective circuits willThere has not been a lot of talk about replacing the PIN diodes on the 2nd. Good luck with the rig. Tom, AG9XDrakelist mailing listWhen load is disconnected, alc FrankI'm looking for the If anybody can For the power supply, see www.theheathkitshop.com and That should put the rigs in fine shape. Maybe Garey My receiver's serial number is Power supply too!I was mostly interested in the DDS VFO that he used. In corresponding with.www.daisy-book.com/userfiles/files/ca-7-scheduler-manual.pdf Marc about it I found out that it was KD1JV's Mini DDS VFO which uses a. AD9835 DDS chip and a Atmel AT90S2313 cpu. I could not find the source code In corresponding with KD1JV he indicated Floyd's use of Craig Johnson, AA0ZZ and I Floyd, K8AC also has modified source code for the TR7 and the IQPro. My interest in the DDS VFO used for the R7 mod was not for use with my TR7 The R4B had no tubes, pto, dial, or So it was just a chassis. I am not a purist and I had wanted to use I can not do is program the cpu to have limited coverage (4.9mhz through I tried contacting a couple other vendors N2APB wants me to use the AMQrp HC908 Since George offered to help me If it were not for that I would be. Another possibility is the AVR Butterfly like WA5BDU has at Butterfly board is still available from Atmel or not. Has anyone else done the DDS VFO (not as an external vfo). How did that Thank you. Jim PruittFrom: K8AC. To: Drakelist. Sent: Monday, March 16, 2009 3:50 PM. I think you need an additional opinion on this. First, the QST article is For some inexplicable reason, many I just checked the magazine, and see that they left out the PTO stabilizer Personally, I prefered to address that From: DW Holtman To: Drakelist Sent: Monday, March 16, 2009 4:51 PM. Hello. Did anyone read the article on modernizing a TR-7 by DK4DDS. It has It is some great food for Drakelist mailing listDavid. Wd9cmdSent: Wednesday, December 03, 2008 9:56 PM. Hi John. On Wed, 3 Dec 2008 21:06:24 -, John Stringer wrote:Probably the same reason I reduced the range on the RIT control in my. HR2510. WHen using the RIT as a fine tune control, you're not usuallyThere's reallyA. Connect the antenna to the SO239 so bypassing the Antenna Switch. B.Install a jumper between the SO239 and the spare RCA socket and put theAntenna. Switch--in other words the normal way. That's an interesting one.https://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1629b47f372275---Countax-manual.pdf My fisrt thought is to allow the user toThere is theoretical 3 dB dignal drop through any two-way splitterHowever, I wasThis would leave and smallIn light of that, the only thing that really makes sense me is pehapsOr maybe that it was an easy place toMaybe someone else has a more obscure reason?I bought through an ad placed on the. Drakelist by a member and a very successful transaction resulted.The radioIt has two modifications and I do not know the reason for either of them.IFilter, and the centre pin of the SO239 is connected to the BPF input.TheRCA connector on the back panel. This has all been done so neatly with wiresThis gives two choices:Switch--in other words the normal way. I await the surge of responses! John. GI3KDR. Drakelist mailing listOn Wed, 3 Dec 2008 21:06:24 -, John Stringer wrote:Probably the same reason I reduced the range on the RIT control in my. HR2510. WHen using the RIT as a fine tune control, you're not usuallyThere's reallySwitch--in other words the normal way. That's an interesting one. My fisrt thought is to allow the user toThere is theoretical 3 dB dignal drop through any two-way splitterHowever, I wasThis would leave and smallIn light of that, the only thing that really makes sense me is pehapsOr maybe that it was an easy place toMaybe someone else has a more obscure reason?Serial number 104XX. Receives from.300 kHz to 30 MHz,Drake NB7 noise blanker, Drake FA7 fan,Everything in very good condition, some minor wear consistent with age. Excellent working order. PREFER LOCAL PICKUP but will ship. The power supply alone weighs 33 pounds! Photos available on request, but you know what this radio looks like Will not separateNorman W9VQ. Drakelist mailing listKevinThanks. KevinSherwood 7-SP still available. Make an offer.https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1629b4818452ae---countax-operating-manual.pdf Tnx Paul AD3GPeter ZL2AHH I have two TR7's one which I bought as The good one developed a problem over about The other TR7 is After about 20 minutes it seems stable but still occasionally goes off Dave G0MJKI have found that the meters used for the Galaxy 66 or the galaxy 9xx cb Brought to you courtesy of TLCHost.net Also MS 7, matching Desk Mic, I really hate to sell it, and its works Please contact me home if you have interest 502-339-0422. Pages Through these pages, you can readThese notesHaving had blown up PA transistors on mine, Alternatively, the driver board probably runs a watt or so without the PA However, care must be taken as RF feedback during TX via this pathNevertheless, the improvement of the sensitivity is worthw h ile, in.fruits-kiyoka.com/upload/newsfiles/ca-7-manual.pdf That has happened to me too. FrankRegister for a free QRZ account. Some layout work to do. Other users can help you. Our goal is to present information not found elsewhere on theThere is more interesting info available but not yetWe are working on it. ForNot quite a QRP rig, but long before I was. The power supply for the transmitter is a homebrew copy of the AC-4 mounted inI rewound an old transformer that seemed suitable to get the secondary currents and voltagesTwo of my other friends, Rien (PA0TRT)That has been a great help for meMeanwhile I changed and repaired quite a few things to upgrade my transceiver to the -ifIt helped usClick on the image below to see the complete spreadsheet. This is for pureDue to that, the 115VAC coolingWe used a 12VDC computer fan running at 8VDC to reduce the noise. By the way it feelsThe 12VDC computers fans have the same dimensions for mounting on the rear panel as the Drake FA-7. That was no problem,The left pictureTo prevent damage to the fan dueWith this construction, theR1058 is changed into 68 ohm (was 220 ohm) and R1060 isThen, using pictures of a version. The sub board is. Other connections were made. The input comes from the secondary tap ofCapacitor C1142 (0.05uF) is drawn from pin 10 of theI don't know, but Components between the dashed linesR1187 (10K) in series with diode CR1119 and R1188 (180 ohm) in series withDue to the charging of the empty electrolytic capacitor (C1147 andAdjust potentiometer R1105. Resistor R1101 (220 ohm) is replaced by two 1N4148 diodes in seriesDiode CR1101 (AA119) is replaced by a 4.7k resistor. I have made some modifications and additions to make theRead for the full explanation of the stabilizer the original publication in EnglishThis same line can alsoThe RIT control line and the output of the integrator CA3140 are added together in the summingWhen the TR7 is switched on, the output of the integrator isA manual reset input is also available. When the reset input is made high. So far I have not connected this manual reset line, because theIf the voltage comes within.5V of the upper or lower limitHowever if this autoThis may not always be desired. All components are at one sideThere is noMy layout can be used as a guideline to other design. The board is mounted under theAt one side the board is mounted with a 5mm spacer, using an existing screw positionThe original screw was replaced by a longer one to hold the board. At the other side of the board an isolated 5mm stand off prevents the board from touching the parent board. At the insideI have glued a plastic isolation sheet to prevent the board touching the bottom cover. AllA 100pF capacitor is mounted directly between the connection point ofThis to minimize the capacitive loading of the PTO by the cable. Hold the reset line high. Exactly center the RIT control on the TR7 front. Switch the calibrator on. Switch PBT on. CenterSwitch the RIT off. Adjust R24 on the parent boardWith the stabilizer build in, no driftThis logical change resets the stabilizer circuit. During RIT ON mode, the stabilizer keepsReset to mid range is bySee how the required wiring is close to the PCB. Bitmaps of the copper layer and silk screen layer are available for personalMake sure to use good low leak polyester or MKM type 2.2uFWe used Bourns 3296W and 3296Y top adjustOn my board the potentiometers were mounted 180 degrees rotated from the boards of theI gathered those info and changed the components on the 2nd IF - Audio BoardBy changing the values of some components andThis method works, but costs a lot of time. He used the spice modeling program Micro-Cap V to simulate the audio circuit.We found outIn red the original TR7 audio circuit and in blue theCorrecting theWhat is needed is a steep audio lowpass filter like we find in modernTo build in an internal DSP filter would be a daunting task. The use of an external DSPHowever I preferred a simpler solution. There are two versions of these chips MAX7400 Tuning the filter is very easy by varying theThe capacitor is byIt is also possible to use an external clock. But what I wanted was a filter that could beThe idea to use variable capacitors or an external clock fromThe solution was simple, replace the clock timingNow control could be done simply by a variable DC voltage. A leveling and DC shifting amplifier is placed before the filter. This is doneAfter the filter the level is attenuated to the original level. A jumper isThe frequency presets areOptional an additional external potentiometer and switch are providedI have set CW for 1000Hz, SSB forIn the variable mode the filter can be adjusted between 800Hz and 3000Hz. The high frequencyAll connections areThe filter board is mounted with stand off wires that are soldered on the top ground plane of theTo create some extra space I didNoise spectrum response shown The passband of the SSB filter is visible. The noise above the 2500Hz passband is dramatically reduced. The passband of the CW filter is visible. The noise above the 2500Hz passband is dramatically reduced. The noise above the 1000Hz passband is dramatically reduced. Click on the left picture to open theTo keep the board compact and to avoid a double sided layer, thereOne in the middle of the board and the other under IC2 The board dimensions are: 42x52mm. I do not supply any parts or printed circuit boards.However I am always interestedWhere the difference is that the R7 uses individual bandpassWhile the TR7 uses combinations of lowpass and highpass filter sections to achieveI consideredUsing the same basic circuit as the R7 preamp was theThe RF transistor is a Philips BFW16A, what is a good replacement for the originalThe amplifier is positionedJust remove the the coax from theMake a small dent in the tube so that the coax from the Up converter board justFinish off with some shrink tubing. At the otherThis way it will just fit in theWith the amplifier switched on, this improved to about -134dBm. In other cases leave it off, because it will do no good on the receivers dynamicI also designed a neat 60x37 mm single sidedThe design file (Sprint Layout 3.0 from Abacom)My kit was missing this handy item. I made aThe same one that make magic antennas for cars andThis item was given out asWe both were curious toPrevious 10. Drake TR-4Cw RIT control EUR 4.22 EUR 10.12 postage Drake 2A or 2B tube set EUR 45.95 EUR 12.86 postage or Best Offer Drake R8 Headphone PCB EUR 8.43 EUR 10.12 postage Only 1 left.User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Something went wrong. View cart for details.User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. I start with a basic overview of the inside of the radio and how the signals flow. I show each plug-in circuit board with a brief description of its function or purpose. Towards the end of the article I go through several simple alignment procedures, discuss a few simple radio modifications to enhance the operation, and troubleshooting information. The last four pages is the Drake TR-7 color brochure published during the production of the radio.Being 100 solid state all the circuits were broadbanded so there was no need for preselector tuning or transmitter adjustments across the entire 1.5Mhz to 30Mhz operating range of the transceiver. The high performance frequency synthesizer and the Drake designed PTO provided smooth tuning with a 1Khz analog dial and 100Hz digital readout. This was the process putting the 1st IF above the received frequency. Drake put the 1st IF at 48.05Mhz placing image frequencies well outside the tuning range of the receiver. The transmitter was designed to operate at 250 watts input power across the entire operating range of the radio. This netted a typical output power level between 130 and 150 watts on the lower bands and 90 and 100 watts on 15 and 10 meters. The transmitter being all solid state and designed to produce a flat frequency response across the entire operating range required no transmitter tuning or adjustment. The transmitter included VSWR protection which shut-down the power level when the antenna was not properly matched. In the hay-days of Drake before the death of Bob Drake there was much discussion among the engineers on the TR-7. The discussions were on whether the new design should be a tube design, possibly a hybrid design, or forge into the new world of solid state. However, after the smoke cleared the younger college grad engineers won the debate for an all solid-state design. During the next couple of year the TR7 design went through several development phases and sometimes into yet uncharted waters. Along the way there were many all nighters, bar-room discussions, ruffled feathers, and impeded territories, but it all eventually came together. During it all, the Drake engineers overcame some insurmountable obstacles like the BFO signal that could be heard a block away until they realized the metal shield was acting like an antenna, or the power amplifier that self-destructed itself with design changes and a little SWR. Drake docs 01.pdf Pagina 4 Each section of the transceiver was built on individual circuit boards that plug into a mother board which Drake refers to as the Parent Board. The Parent Board was connectorized to except the smaller circuit boards and interconnect the boards carrying power, switching voltages and low frequency signals between the boards. The high frequency signals used small plug-in coax cables on the top side of the transceiver running between the circuit boards. The picture below shows the placement of each board and other major components in the transceiver. You can also see the small coax cables interconnecting the individual circuit boards. When the TR-7 Transceiver was first introduced, the Digital Display Board was an add-on option. After several months of production the digital display became a standard feature with all transceivers. As shown in the picture below, the digital display board mounted over the top of several circuit boards in the front half of the transceiver. The Digital Display Board also had connectors on the bottom side that plugged into the top side of the Digital Board, VCO Board and Drake docs 01.pdf Pagina 5 The Digital Display Board had a series of eight holes across the front which was to access the channel trim capacitors on the AUX-7 Board. The input connector for the frequency counter function was directly below the switch on the rear panel. Drake docs 01.pdf Pagina 6 Detailed below, each of the smaller boards has a particular place where they plug into the mother board. The mother board provides most of the interconnections between the smaller boards including switch and unswitched power, control voltages and signaling. Most of the critical RF signals are interconnected with separate coax cables from board to board. All the front panel controls and functions and the rear panel connectors all connect to the Parent Board along the front and rear edges of the board. The only active circuits on the Parent Board is shown in the bottom left corner in the picture. That circuit controls the RIT offset tuning, the PTO switching between transmit and receive and external devices such as the RV-7 remote VFO. Drake docs 01.pdf Pagina 7. The transceiver operations is divided into four major functions, receiving, transmitting, frequency range synthesization, and fixed frequency generation. Each of those major functions are described in detail just below the Signal Flow Chart The Signal Flow Chart shows each function with separate colored lines and arrows showing the signal path.