In my opinion if you are primarily a ssb only operator you will probably be pleased with the 75s 1 as it will work fine for ssb work and for casual non qrm conditions it will work ok for cw as well and it is a price performer compared to asking and selling prices for the 75s 3 and 75s 3b. May copy those single sideband signals on a collins 75a 3. Gaylord harts account of his testing of nos domino capacitors. Am reception is provided, and the passband can be optimized by the installation of an optional 3. The newer collins filters which inrad sells have a common ground between input and output and cannot be directly substituted for the oem. Installing inrad filters inrad has designed an adapter board to allow the use of the new series collins filters in the 75s3bc radios. Modifying the collins kwm2 for serious cw operation. It will mount on the chassis just like the original one and has modern capacitors used inside to insure years of trouble free operation. Then, over 40 years later, i obtained the almost brand new 75s 1. Document code prefixes the following list of 2 letter prefixes is used to identify the quality documents maintained by. To open downloaded files you need acrobat reader or similar pdf reader program. This time is for sale collins 75s 3 receiver in cca excellent conditions, serial number is 105xx. Installing an inrad ssb filter the oem filter in the collins 32s 3 has a balanced output which is isolated from ground.
Theres no denying that the 6bf5 runs hot in those receivers. Collins lear inc mechanical filter for ham radio receiver freq. The package also came with an rf power components maxituner from the 1970s with a cabinet that nearly matched the collins. Discussion of collins developed noise blankers for the kwm1, 75a4, and 75s 1 amateur. View and download collins 75a 3 instruction book online. Collins 30k transmitters at this point, 2 30k1s and a 30k2 have followed me home. No marks or scratches, original paint, inside is super clean as you can see in photos, it has been recently revised and adjusted, it has been retubed also, with excellent audio quality and sensibility, i have tested this receiver with my signal rf. The collins 75s 3bc receiver the collins 75s 3b is a versatile receiver with exceptionally sharp selectivity and operation in any of three modes ssb, cw and rtty. Extend the life of 75sx receivers home of the collins. August collins, leading manufacturer of amateur radio equipment.
By replacing three oscillator tubes, two audio tubes and two lamps with solidstate equivalents, the total power consumption of the radio is reduced. Frequency displays on modern radios are typically light years more accurateto within 10 hz per megahertz or so. Then, with the 75s 3 and 75s 3a, art dictated that all the receivers be shipped with a 200 hz cw filter. All manuals include schematics unless otherwise noted. View and download collins 75a3 instruction book online. Foreigncalculated by order weight and destination and added to your credit card charge. Viewing and printing of cca portable document format.
Designed to replace 75s series 6bf5 audio amplifier tube directly. Note that this manual is worthwhile even if you already have a 51j3 manual, as it has. To open downloaded files you need acrobat reader or. September a selfcontained tabletop transmitter collins 32v 3. Buy, sell, trade hf and vhf equipment, towers, antennas, rotators and more. This thing was built with lots of rugged quality in 1959, and still runs strong like its a new rig today. The service bulletin only refers to the 75s 3b and 75s 3c because those were the only receivers in production at the time. The following collins radio manuals are divided into multiple sections. A legacy of high quality pari 2, the 75a1 by ray xtrrwald, n0lms 10679 wrsl dartmouth avr. The 75s 3b has exceptionally sharp selectivity during operation in any of its three operating modes which are ssb, cw and rtty. Please give me a hand digging up information on a most unusual collins receiver, the r627urc8. Control of documented information op 75 01 rev nc 5.
Service manuals, schematics, eproms for electrical technicians. Heat is the major contributor for components degradation in the radio. Co 80227 948 was ihr first full year ot pmdix lion for i hi revolutionary new collins 75 a 1 receiver, advertised as the lint really new design since the introduction the superheterodyne. Brand new stock that was squirreled away in a radio shop on radio row. Collins manuals page 3 all manuals are copies and are madetoorder unless otherwise noted. What your frequency display really tells you part two. Antique radio forums view topic collins 75s1 modifications. Installing inrad filters inrad has designed an adapter board to allow the use of the new series collins filters in the 75s3b c radios. I have owned and used a 75s 1 and i currently own and use a 75s 3b and a 51s1, among others.
The fig 4 caption says that the 75s3 dial reading shown equates to 24512 khz. There were modification kits available during this time to convert 75s 1s to 75s. Rockwell collins radio service instruction manuals schematics. To minimize your download time, we suggest you check the table of contents files toc first to see which sections of a manual you need and then download only those specific sections.
Collins 75a1 receiver service manual download, schematics. In fact, the 75s 3 has a 200 hz cw filter built in. The collins amateur equipment described herein is sold under the following guarantee. Hopefully, i will restore it to a nice working condition as soon as i receive it. What your frequency display really tells you part two arrl. Reducing product detector noise in 75s3 rcvrs part i mod weber. Your question about the bfo knobs for the 75s 3 is a new one to me.
This collins 75s 1, 75s 2, 75s 3 abc new chassis mounted replacement capacitor can, is a custom made, nickel plated can, with mounting tabs to fit in the same slots as the original can. A collins sline troubleshooting and repair adventure pdf4pro. If you have some stuff that not is listed here you can donate this by contact mods. When we enjoy vintage gear, we need to be careful not to ascribe digital precision to systems that cant provide it. Service bulletins and service information letters for the kwm122a and sline series of amateur equipment. The collins 75s 3c is a versatile receiver with exceptionally sharp selectivity and operation in any of its four modes. All manuals include schematics unless otherwise noted not all listed equipment made exclusively by collins. It was a winged emblem 32s1 transmitter, 75s1 receiver, and a 516f2 power. This page is devoted to my recently acquired collins 75s 1 receiver.
Front panel controls are identical to the collins psu i need to find some white rub on letters for the front panel. The collins 75s 3a has 14 additional 200 khz positions and an additional knob above the band select switch. Full text of the collins 75aseries receivers a legacy. Simplified schematic of 75a3 rf circuits 75a3 receiver. So i bought the package, consisting of a 75s 3b receiver, 32s 3 transmitter, 516f 3 power supply and cabinet, in which a speaker had been mounted. The biggest and best ham radio classifieds on the web. The newer collins filters which inrad sells have a common ground between input and output and. Then when its day comes for outgoing and leaving the factory, it gets a date sequence way different than it was made. Collins collins 30l1 manual collins 30s1 manual collins 32v3 modified speech ampdriver by wa1hlr collins 75s1 cw filter installation. Note that this manual is worthwhile even if you already have a 51j 3 manual, as it has. Unlike the drakes, the collins radio chassis age very well.
Collins agrees to repair or replace, without charge, any equipment, parts, or accessories which are defective as to design, workmanship, or materials, and which are returned to collins at its factory, trans. How to extend the active life of a collins 75s receiver. Back to collins rockwell next receiver last modified 20040714 collins 75s 3. Please give me a hand digging up information on a most unusual collins receiver, the. The small knob at the upperright corner of the tuning collins 75s receiver. Collins 75s 3 32s 3 two disc set, 226 minutes total ode no.
It is the collins 75s 2 receiver with the additional fourteen 200kc bands and switching and crystal bank features like those on the 75s 3c. I like to compare the collins sline to the drake bc line. I use it as a companion to my heathkit dx60b transmitter, and could not be happier with its am reception performance. This changed with the 75s 3b and 75s 3c when the filter was an expensive option. In october 2011 i obtained a collins sline station from a friend and fellow. For am reception the passband can be optimized by the installation of an optional 3. Pdfa3 allows embedding of any file format such as xml, cad and others into pdfa documents. Cw receive signal flow now we come to cw operation in the figure 1 the original kwm2 frequency plan for ssb and cw modes. Very few of these receivers were made from 1958 to 1961 during the production of the 75s 1s.
These signals are sent to the second transmit mixer and mixed with the 17,355 khz crystal oscillator to generate output sideband signal frequencies between 14,300. Electrically the same as plugin model 526949800 f455fa60 except the y model needs to be soldered. The 75s 3b has exceptionally sharp selectivity during operation in any of. In the next days due to lack of use and place i am going to sale part of my collins and drake collection collected for yearsand some howard mills radios restored. Solid state 6bf5 home of the collins radio association. Discussion of collins developed noise blankers for the kwm1, 75a4, and 75s1 amateur.
Search and free download all ebooks, handbook, textbook, user guide pdf files on the internet quickly and easily. By replacing three oscillator tubes, two audio tubes and two lamps with solidstate equivalents, the total power consumption of the radio is reduced from 70 watts to 40 watts. In addition, some files are archived, so you need winzip or winrar to open that files. Note that there is a limit to the number of files you can download. The collins 75s 3b is a double conversion, super heterodyne receiver that covers all of the amateur bands between 3. Bottom line, the safest way to date a radio is with date codes. Anyway, i found a very nice example of a 75s 3 and its undergoing cleaning, etc. Fig 4reading your operating frequency on a collins 75s3 receiver involves adding the megahertz indicated by its band switch a to the kilohertz shown on. Installing an inrad ssb filter the oem filter in the collins 32s3 has a balanced output which is isolated from ground. The inside of the receiver and the inside of the transmitter are clean.