Collins R

Col ins Communications Receivers

1 have been selling Collins Communications Receivers for better than ten years. Because my standards are very high, I had to price these sets at proportionately high levels and relatively few are aware of my service in this field. ! offer for sale the finest variety of the best communications equipment available in the United States, and in quantity. My prices vary from about $400 for a poor grade R388 to almost $2000 for the best grade R391> These receivers are all built around Collins permeability tuned oscillators (PTQ), a device which in itself is a marvel of electro-mechanical engineering.

Collins introduced a radical departure in communications receivers in the year 1948 with the introduction of their 7GÀ1 receiver, Amateurs may remember that this receiver defied convention at the time and opened up a whole new field for Collins* This device, in effect, had a crystal controlled front end and a variable tuned IF. By using relatively low frequency variable oscillators, Collins was able to vastly improve upon the stability of the communications receivers available at that time. Their 75A2, 3, 4r produced in the tens of thousands, were to become world famous in the amateur field.

It is not generally realized* however, that back in 1950* this same concept was incorporated into a general coverage receiver known as the 51 J. The 61J covered the range of 600 KC to 30.5 MC. It did se with an overall accuracy of better than a kilocycle and provided a means for accurately tuning any CW, MCWt or AM iignal within its frequency range. In the early days, these receivers were very much sought after by every branch of our Government who used such gear and they became the means for extensive monitoring by the FCC< The 51J went through a logical series of changes ending with the J4 which incorporated mechanical filter. Its predecessor, the 51J3, was widely reproduced as the military R388 and be came known to countless amateurs as well.

By 1955, the first of the R390 series had been produced* This was a heavier, more rugged, receiver of somewhat radical design. Likewise general coverage, it provided for digital readout and a higher order of accuracy and stability over the range of 500kc thru 32M C. It was also a mechanical marvel and this model was purchased by the thousands by the military for use in point to point work and discrete frequency surveillance,

A somewhat less complicated version without voltage regulation was introduced about the year 1958 and known as the R390A. Versions which provided for remote tuning of up to seven channels were the R391 and for light weight limited applications, R392.

The R389, on the other hand, may be roughly compared with the R390 except that it covers the range to 15 KC and was obviously a particularly good receiver for the study of Doppler effect and reception of long wave signals. This set, like its sister, was a mechanical marvel even more so, however, in that it incorporated automatic band change and a refined servo system as well.

When we obtain these receivers, we painstakingly overhaul and rebuild them until the standard of performance is equal to or greatei than the original specified performance. Par ticular attention is paid to the PTO and, if possible, the PTO's of these sets are replaced with rebuilt units available from Collins.

The degree with which the receiver provides linear operation over its range determines its price. Other features contributing to price are appearance and the degree of tracking from one megacycle range to another. With reference to the 51J (R388), as an illustration, it is interesting to note how our standards apply and determine the ultimate selling price. Assume for this illustration, that the receiver has been turned on for at least 10 minutes and that the dial has been set to an even megacycle mark. Set the fiducial or hair line at the exact center of the calibrated bezel, Turn on the calibrating switch and set the BFO to zero beat Now, without touching the BFO control or the calibrating switch or for that matter any other control, tune the KC knob clockwise until the beat note will be observed at the extreme 500 KC point at the right of the dial. You will note a deviation error. Write down this error in KC or cycles and now rotate the main KC knob to the other extreme of the dial and observe the error at the left end of the main dial. The sum of these two errors will be known as the maximum deviation error in cycles or KC per megacycle, A very excellent set will have a total deviation error of less than

2 KC and such a set is worth between §750 and $1000, With the deviation error between 2 and

3 KC, the value of the set will range between SGOO and $750; when the deviation ranges between 3 KC and 4 KC (the maximum allowable limit), the value of the set may be stated between $450 and $600. If the deviation is greater than 4 KC, the oscillator must be replaced and a new, or rebuilt, assembly obtainable at a cost of $190 from Collins be installed.

Now go back to the first part of this test and leave everything established for an even megacycle mark such as 2 mc. Observe the zero beat and then rotate the megacycle switch knob to an adjacent odd megacycle such as 1 or 3 mc. Then slowly tune the KC knob until the new zero beat has been obtained. Measure this difference as an error- For the best sets, this error will be less than 1 KC. For errors in excess of 2 KC, the value of the complete receiver has to be reduced proportionately.

The very best sets are those which meet these specific tests and whose appearance comes closest to being like new. It must be presumed that sensitivity and other performance factors will be equally high.

The specific range in price on the R38iTs varies from $700 to $1200; on the R390, from $1000 to $1400; on the R390A, from $1000 to $1500; on the 391, from $1200 to $1600, All of these sets are guaranteed and supplied with instruction manuals and adequately packed for shipment to any part of the world and are available in quantity. Do not hedge. These are the best quality communications receivers made in the world. They have no peer. Even Collins' latest sets do not excell in quality and except in size and in weight, there is nothing made today that can equal the outstanding performance of these communications receivers. Those interested should write for specific information and quotations.

Herb Gordon WllliV

Radioamateur Collins

BC-221 and TS-175

Heterodyne Frequency Meters

The unit illustrated at the right in the photo is the TS 175AU frequency metei li is similar in operation and use to the BC22Î, but covers a frequency range of

85 to 1000 mc. Price on it y ran

The unit illustrated at the right in the photo is the TS 175AU frequency metei li is similar in operation and use to the BC22Î, but covers a frequency range of

Heterodyne Frequency Meter

Nowadays solid state computer techniques are employed in a digital readout counter so as to measure frequency. Such instruments sometimes are available to the ham through his place of employment. Even more rarely, the ham can buy a secondhand or used instrument of this type.

Generally speaking, these wonderful modern instruments cost between two and four thousand dollars and are beyond the means of most of us. But hamdom must have a way of measuring frequency at a price it can afford and the old standby, the BC221, is still the best device of its kind to ever come down the pike,

BC22i'fl can be had in various places in conditions that are good, bad and indifferent and you would never know how to determine whether the instrument would be a good one or a poor one without actually subjecting it to test or evaluation. We take all of the guesswork out of this for with hundreds of BC221's to choose from, we subject each of these to certain specified tests. Not only must each instrument match its calibration book but the linearity of each instrument must be acceptable within the tolerances specified by the Government in the technical manual TM11-300.

The term BC221 refers to a heterodyne frequency meter which covers two specific ranges —125 kc through 250 kc, and 2000 kc through 1000 kc, By means of harmonics, the instrument can be used to measure frequencies all the way up past 100 megacycles and by means of simple changes or modifications the details of which are expressed in a leaflet supplied with each instrument, the BC221 can be made to provide accuracy of the order of .002*5% or even better. Indeed, it is possible with the additive or subtr active method of measure ment to read to as small as ,0002^. Each BC221 that we sell is thus a basically good instrument which will meet the conditions of accuracy as described hereafter and as a result each of these instruments can be used not only to measure frequency but to initiate a frequency for such purposes a^ modern sideband synthesis techniques require. If you wish to build vour own exciter or YFO or to calibrate and measure filters for teletype and sundry purposes, this device will positively allow you to do it. The BC221 has stood the test of time. Kaeh instrument is at least 20 years old now and you might say, it has been properly aged, Before we ship out any instrument, we determine that both ranges are accurate according to the book. We also determine that on the low band, 130kc, 160ke, 190ke, 210!:c, and 210kc fall within one-half a dial division accuracy as compared with our precision standard, On the high band, we check for similar error at 2100kc, 2400kc, 2900kc, and 3800kc, Our standard is a Motorola high stability oscillator used in conjunction with a Systron Don iter digital readout meter providing better than one part in 10" accuracy per 25 hours. This is an amazingly good tolerance ami guarantees the purchaser satisfaction within the intended application of the BC221 so when you fellows compare price, you should also try to compare accuracy.

Here is our schedule of pricing:

For standard nomenclature BC22TS, models A through AH models AK and AN

For either model with certification $20.00 extra.

We have a power supply kit that we have assembled and which will provide this instrument with the perfect combination of voltages and current to operate at 115AC, We supply just the parts and instructions and the price on this is $14,50,

Remember that the BC221 can serve as a signal generator as well as a test oscillator and as well as a heterodyne frequency meter Your satisfaction is guaranteed—no pig in the poke here.

Radioamateur Collins

Wave Meter TSl.rj PPM-l.

Covers the range 155-235 MHz. Each wave meter has a separate diode detector for indicating resonance and has an especially we I calibrated BC221-type dial. Only So while they last.

Rockwell Collins 516f

Microwave Accessorj Kit. Packed in hinged wooden box 12" x 12 x 3" intended for AN/MPM-3. Includes J each UG-81/lJ waveguide to coax adapter, 1—UG-163/U waveguide flange adapter, 1— CG-92/U cable assembly, 1— AT-48-UP X BAND HORN antenna and 1 UG-85/U connector. New merchandise 5 lbs $5.00

Pto Oscillator Foto Collins
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Radar Eclm Bo* AN/UPM^IO. A coaxial type resonant cavity used to monitor radar systems operating in the range of 1150-1350MC Deedy 3.5 lb pel micro second. Sensitivity I db. power loss for 50 yard ringtirne. Temperature coefficient .105% ringtime degree F at Uses 3-IN21B diodes. New Weighs 2h Ik-. Citfi: .\nc\e $2000 00. Tour Cost >70,09.

Radioamateur Collins

Wave Meter TS111. A

axial cavity wave meter covering range 3000 to 3600 MHz with an accuracy = 1 MHz. Includes indicating meter, calibrator chart, and 1N21 rectifier, Controlled by precision micrometer. ? 14.00 45 lbs.

Oscillator 0*12, This is a signal generator operating between 155 and 235 MHz; with a built-in attenuator assembly accurately calibrated to more than 100 db, below I volt- It employs a remote cutoff piston attenuator. These o^cillator.-nornuiliy provide pulsed RF output hut can easily be employed for CW with a simple change. ?9.70. 7% lbs.

247 Sarkit

S Hand Transponder. RT^21/APN-21XR Measures 13"W x 13"H x 10"D and weighs 21 lbs. Supplied less tubes. A veritable wealth of S band components—pulse transformers and generally useful components. Basic cavity may be used in amateur microwave work around 3000MC and uses light house tubes. A Shepard McNally Klystron 707E used in 2nd cavity. 12 or 24 VDC and 400 cycle 115V AC single phase. Bargain priced at $15.00

SRT Navy HF Transmitter. Includes Rf amplifiei AM 1008/SBT pro* vidtnc 100 conservative watts output from h 4-+0*1 A with mechanically ganged eervo controlled tuning torn usinp vacuum variable condensers.

The audio modulator SHTt ihe RF synthesizer

0-275 SRI which r n tes a i y db -crete signal in increments of 10 cycles between 300 KC and 26MC. and the power supply PP 10»4/ SKT, The entire assembly weighs G50 lbs* and operates on 60 cycle 115V, $18000.00 original coat for $350-00»

Magnetron Radar

X-Band Radar An early airborne radar set for X band includes receiver and pulsed magnetron. Allow 100 lbs. $50.00 each. Here's your chance to have your own radar trap or weather eve. Requires 116V 400 cycles and 28V DC.

Good Surplus Values

A Ken lion! Volkswagen Owners—DC to DC Converters: For Volkswagen owners, we offer a DC to DC converter. This transistorised device converts 6 volts DC to 12 volts DC. It is capable of famishing 6 amperes of power at 12 volts. This is RCA's #M1-11583 and measures 1H-" deep x 6" wide x high. Only 3o pieces available at 312,50 each. 3^ II*.

600v Cycle Converter

Bridge Rectifier Transform mer suitable for solid state application. Capable of furnishing 600V at .5 amp; 115V primary; secondary rated 545V at .455 amps. 5*4" square x 5" high, $7.25 15 lb?.

aU-hin£ transformer; Here is a very high quality line-to-grid transformer- Primary either 200 ohms or 500 ohms impedance and secondary 30*000 ohms grid-to-grid with & center tap. It may also be used as a low-level plate-iu-multiple line transformer, UTC-4050 $2.50

G,E, Air Capacitor. 20-440 pf, 7" long x 2" x 2" ceramic end caps with shaft.

Heavy brass construction, .015 spacing Excellent as a loading capacitor or for general purpose work. S4/ea, lbs.

Sockets; RCA 9935 7 contact socket with built in capacitors- Semi-shieMed for use with 829B, :%E29 and 832. Price SK80. 1^0 available.

Kerrite Antenna Coil: G%" long x 5/16" diameter. I bought these at a very low price and found them to be particularly attractive when bunched together as a core f«-r winding filament chokes. Use 4 of them wound wiih electrical Tain :is a core for 41000, 590 each. 4 $2,00. -i ost. each.

Plate Transformer: Center tapped secondary» 2100 volts either side of center, rated at mils continuous duty arid insulated for 4286 volts. The primary ia intended for 207r 220 or 225 volts single phase. This merchandise» made by Union Electric & ilanufac-turing Co. in Jersey City, is offered in limited quantity at $34,95, The transformer measures 9s/ii" wide x 7%" deep x high and weighs 59 lbs. Here is a tremendous value. Check the weight with copper and Steel prices today and see what a value it is. Only 17 pieces available.

Radioamateur Collins

Solid State or selenium rectifier transformer made by Raytheon, their #UX»1I5A; primary 60 cycles; secondary tapped, from 28 to 48V; rated 2 amps but good for 4 amps. 4W* high x 3K* deep x 4" wide. $4 each 7% lbs.

Radioamateur CollinsRadioamateur Collins

Toroidal Filter Assembly for RTTY. These new Humphrey units measure only x 2'\ We have them com* plete with their sockets in matched sets tuned to 2125 cycles? and 2G7G cycles, 38-50 per set. ^ lb.

Loading Capacitor. Here is a two-section Ion ding con* denser each section varying between 20 and 600 pf bo that the sum of the condenser will extend ui> to 1200 pf which is more than adequate for most high-powered finals. The spacing is excellent. The condenser measures behind the panel. Its width is and its maximum height with the condenser open is 2?4". This is straight line frequency, A particularly good value at $3 each, U" shaft, 2 ibs.

Radioamateur Collins

Dual Bearing Hamrnar-lund Capacitor. 100 pf straight line capacity. Kxcellent for a variety of genera] uses. each, 10/$7,60. 4 oz. each.

Radioamateur CollinsCollins Axial Mechanical Filter
Colli ns RF Plate Choke—sr^od for high-powered final; capable of at lea>t amp and suitable for SO-10 meters. î4/ea, Vj Jh.

Herbert W Gordon Co. Amateur Radio Cotoîog he following: miscellaneous listing is meant to portray a representee portion of our stock so as to convey an idea of the breadth of our inventory. With over 2500 pieces stored, and with a constantly changing variety, it would be very difficult to itemize each piece of gear available.

Similarly we have over 1000 used units of ham gear available; probably the largest stock anywhere. We do NOT put our price sheets on this classification of goods for you to compare us by. But we do publish a comprehensive listing in specific detail by set, serial number and condition and we will gladly send such an unpriced list to anyone—upon learning of your choice. We will then quote you directly. The best thing to do is to visit and see yourself the largest collection of ham goodies ever gathered together in one building. I am confident of our ability to please you.

AN URM-13 Dummy Load $-20W HXMOO MC UTR-2512 Marine Radio Telephone, 12V, 1GA EES Field Telephone Type y()28l Milieu Power Supply,

700 V @ 236ma, 6.3V <Q 4A Mudel Keif. PS. 350W, Mfg. by Lnmbdii TVN-6BH Klystron P.S., Mi*. by Weston Labs. Twin P.S., 115V IN OUT ¡300V @ 150ma,

—100V, 6.8V-3A TVN-9HG, Klystron P.S, Mod. 2S, Reg. P.S., Lambda Mod. 206-FA HV Keg. F.S..

IN 115V, OUT 1000V-200 ma Mirfi. MR 3000 Mag, Research Corp.

lieg. DC P,S. <+Stablvo)t" 300V-1A Miid, 32 Reg. P.S„ Lambda, 3SOW, 106-125V i'U*4, Microphone, Sony CR-4, Microphone, Sony Mod. 402A, Dynamic Micro Miker Mod. 714, Microphone, PTT Switch Electro Voice M^d. 799 Weston Insulation Tester,

Indicates Leak.Res. TS-128/UP

TS-377/U SWR Bridge W Meter, 26V DC

I 48-B Insulation Tester—Biddle

1-177, Tube Tester, Mutual Conductance Type

TS-117/GP Wave Meter Test Set—Andrew Corp.

TS125/AP Milli-wattnaeter, 0 2 MW

81TT4, Airplane Thermometer Tester

Mod, 802 Microwave Oscillator, 9040-9145MC

Type 675F, Piesto Oscillator by G,R.

BC-1060A, Oscilloscope—Bolton Labs.

Stamford EL TS-47/APR, Test Oscillator, 40-50GMC

Fairchlld Cam. Constant V. XFMRt SOLA, SEC. V.

115-120. 180 VA Type 10B, Powerstat Variable XFMR,

Q-120V, 210VA# 0-132V, 230VA Type 20, Powers tat XFMR 0-U0V, 3A Type W2, G.R. Auto XFMR 0-135V riiUe XFMR. Bendik PRI 200/220/240 V 10,

SEC 2900/1450V, 2,SKVA Mod, 191 Hicluik Xtal Controlled Microvolt

(len. 125-240MC AN/URM 26, RF Signal Gen.t 4-8MC 1-208. RF International Detrala Signal Generator

1.9—4.SMC, 19-45MC SG-8 U Noise Generator—Weston Labs—

1G-150MC ±10?& accuracy Type 1002A, Pulse Generator TS 419/U. Signal Gen- 900-21OOMC Mod. 75, Signal Gen. 4.8 410MC

Measurements Corp. TS*40tJA/U Signal Gen. J800-4000MC,

CW and FM OUT TS-J13/U Signal Gen. 75KC 40MC in fi bands Mod. 20, Signal Gen. 8&KC-40MC SG-38/URN-15. Signal Gen. GO-lOOOCPS Type 1-iOA, Boon ton Beat Frequency Generator

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    How to tune collins 51j4 for best reception?
    10 years ago