(EQP) MR-MSR4030 MacKay MSR4030 1.6 - 30.0 MHz auto tuner. 115 / 230 vac operation. Wired for 230 vac. Gasket sealed enclosure. Weatherproof aluminum cabinet measures 15" x 11" x 28"L plus ceramic feedthru. Mfg. P/N: 698002-000-001.
The MacKay MSR4030 is a 1 kw rated auto tuner for single wire antennas. It provides series capacitance via a 12 - 500 pF, 15 kv vacuum variable capacitor and a 0.1 to 50 µH shunt rotary inductor. Additionally, 100 pF of series capacitance may be added to the output.
The input connection is through an "N" female connector and the output is via a 5" ceramic feedthru on the top of the unit. Both the vacuum capacitor and the roller inductor have optical encoders for tracking precise positioning. Built-in directional coupler provides input to the matching logic as well as external access to the actual forward and reflected power. Numerous control and status signals are available via the I/O connector. The only required signals are RF in, AC power, coupler enable, and a momentary 'tune' pushbutton.
Full installation and maintenance manual included. . Unit is new. We bought it from a company that purchased it for inspection to determine form, fit and function. For sale at a fraction of the original government cost. Our price...
(EQP) SUN-GCU1935 Well, if you have followed us through
the years you know we don't exaggerate, but when the factory
calls this beauty 1kw continuous, I've got to scratch my head. The roller
inductor should handle 30 amps, the vacuum 75 amps. So, with
a little rewiring.....
couple the GSB-900 transceiver and GSL-1900A Linear Amplifier
into a 35' whip and 50' to 150' long wires or works as a line
flattener into unbalanced (coaxial fed) antennas from 1.6 - 30
The general design is an "L" network with series input vacuum cap and shunt inductor at the
output for short antennas like the whip. For long wires, a fixed doorknob is connected in series with
the antenna to form a "T" network. Weighs 85 lbs.
(ANT) CU-815A Altronics antenna coupler as made for
the Dept. of the Navy. Large cabinet (36" x 40" x
34-1/2"H) and proximity of components makes this capacitive
circuit very efficient. Design incorporates three variable and
two fixed vacuum capacitors (not included with basic coupler). Millen
10030 turns counter included. Long wire output insulator on
rear. Basic coupler does not include capacitors or flanges. Shipped
in large crate motor freight only.
view of tuner
CU-815A/F Same as (ANT)
CU-815A except vacuum capacitor flanges
(ANT) CU-815A/C This version of the tuner is complete with all original components.
Two large VMMC-2000-15S (40-2000pF, 15kv) vacuum capacitors (pictured
wired in parallel and tuned with the Millen counter. A UCSXH-200-35S (15-200pF
35kv) is tuned with a single knob on the right of control panel. One each fixed vacuum
capacitors MLC-500-30S (500pF 30kv) and MLC-1000-30S (1000pF 30kv) are
Antenna Coupler 1 to 1.62 KHz
Overall view with
hinged lid over
Large 70µH Edgewound Inductor
Close up view of
Close up view of
drive and Cyclometer
(ANT) 601-192 Commercial antenna coupler as made for
a Midwest radio station in 1988 but never installed. Exaggerated
space in extra large cabinet (33" x 34" x 21"H)
keeps Q high and circuit efficient. Design incorporates three
variable inductors, 10 µH, 16 µH & 70 µH, all extra hurkey silver
plated specimens all driven by B&W 3902 Cyclometers.
Kintronic LV10-15 a 10 µH inductor,
LV16-15 a 16 µH inductor and LV70-15 a 70 µH inductor. 3/8"
silver inter-connect RF tubes for all connections. 2400pF #291
cast mica capacitor.
Includes complete blueprint with proposed
antenna array. "N" connectors in and out.
503178 Vacuum cap, roller
inductor, antenna coupler. Includes: Motor driven (24 vdc) 2P6T
Radio Switch Model 86 Ceramic Switch; CVCH-1000 7-1000 pF, 5
kv (or UCSL-1000-5), vacuum cap (not motor driven). 0.3 - 35.8
µH, silver roller inductor (not motor driven). Second motor /
gearhead (24 vdc), drives 150 pF air variable plus tapped fixed
(EQP) 503178-S The vacuum cap and roller inductor have
been removed from the above tuning unit. Remaining are the motor
driven (24 vdc) 2P6T Radio Switch Model 86 Ceramic Switch and
150 pF air variable plus tapped fixed inductor. Also handful
of nice feed-thru caps. Great builder parts for RF projects.
1.60 - 30 MHz Automatic
Includes Vacuum Capacitor and
24 µH 20 amp Inductor
(EQP) SR-680 This is the jewel from our
SRS acquisition. It is factory rated at 150 watts but has the
capability of being modified to handle 2kw plus.
The main tuning
components are a motor driven Jennings CVCJ-1000 5kv vacuum
variable capacitor and a motor driven 24 µH edge wound 20 amp
variable inductor (See details on this inductor under the Variable
Inductor section of this site).
be the judge! It is designed to operate with Scientific Radio's
SR-380 transceiver on the RS-422 bus but should be able to
be modified (we hope) to operate with a small home-made control
box. We can provide full "Theory Of Operation" specifications
prior to purchase for your perusal. 28 vdc @ 7 amps required
but motors will run on 8-12 vdc. Designed to use 8' to 75'
Our units were completed and tested at
the factory. Gear motors that operate the vacuum cap were
robbed for spare parts so we have priced them accordingly.
We can provide a gear motor we have modified to fit for $95
extra or you can solve the issue. 13" x 16" x 9-1/2"
rain tight enclosure has "N" connector input and a beehive insulator
on the antenna side.
The hinged lid contains most of the control
circuitry. 37 pounds. Copy of a full factory manual included
with purchase. 1981 SRS price was $3,290. We are selling this
brand new coupler for less than the OEM price of it's Jennings
vacuum cap! Surplus Sales special introductory price...
(EQP) SR-VARIOM Low Frequency Variometer. A unique design of an old standby, a motorized variometer. This unit allows variable coupling between 2 series inductors to achieve a limited inductance change in an antenna matching or tuning circuit.
The input to the unit is via an "N" female connector mounted on the bottom of the enclosure. A short length of coax connects to the circuit. The circuit consists of an input transformer with 11 taps. This connects to the 2 series coils in the unit and on the output there is a power sensor. On the top of the cabinet there is a giant 6" in diameter 4" high glass bowl feedthru insulator with a 4" corona disc. Connection is to a 3/8" threaded stud. There is a spark gap.
The inductors are #13 or #14 served Litz wire wound on a giant 6-1/4" form. The smaller 220 µH inductor consists of 44 turns tapped every 4 turns allowing switch selection of 11 different inductances in 10 µH steps. The large inductor is 150 turns of the same wire on the same form with taps at 5 turns, 5 turns, 10 turns then each 15 turns for remainder of the coil. This coil is 2200µH and the taps allow selection in approximately 220 µH steps. These taps are brought out to threaded studs on a fiberglass panel which allow the output lead to bypass turns on the top of the coil. Although both coils are in series they are separated by 1-1/8" on the form.
Inside the form there is an aluminum cylinder 5" in diameter, 1/4" thick and 1" long. This cylinder is mounted on a 1/4" shaft which is coupled to the knob on the internal panel and a 12 vdc motor. There is no control circuit for the motor; it runs whenever power is supplied at 5-1/2 rpm. Rotation of this cylinder changes the coupling between to 2 coils. The position of the cylinder may be manually adjusted by the knob on the internal panel.
On the fiberglass panel there are also ten 30k ohm, 10 watt wirewound resistors connected in series. These are apparently provided a swamping resistors to reduce the Q of the circuit. A combination of these resistors may be selected by interconnecting the desired number of them across the large coil via jumpering to threaded studs.
The external control connector on the bottom of the enclosure provides motor power, output power signal and external input of forward and reflected power supplied to banana jacks on the internal panel. The motor switch on the internal panel switches off external power to the motor. There is also an interlock switch activated by the hinged lid.
The unit is contained in a 20" x 24" x 13-1/2" aluminum weatherproof enclosure with a hinged lid. The lid may be secured by a padlock in addition to the 7 stainless steel clips.
(EQP) SR-605 A low frequency variometer very similar to the above unit. Same cabinet, input / output connectors and coils with motorized cylinder.
Does not include 30k ohm swamping resistors. Coil tap assembly uses banana plugs rather than screw terminals and jumpers. Also includes switch selected 20 watt / 300 watt forward and reflected power meter. All other characteristics of this unit are the same as the (EQP) SR-VARIOM above.
Scientific Radio Systems SR-645
1.6 - 30.0 MHz Ten Band Tuner
(EQP) SR-645 This is the big brother of the SR-640 tuner listed below. They are functionally similar although this unit has more on-board status indicators and controls.
Factory rated at 1000 watts continuous, this unit can probably handle much more under minor mis-match conditions. This is the largest automated fixed channel antenna matching unit SRS produced.
This programmable, broad-banded full range HF tuner is a series inductance, shunt capacitance T network. It begins with a 200 watt / 1000 watt forward and reflected power meter followed by a motor-driven Johnson 229-203 0.1 to 28 µH series roller inductor. Next in line is a selectable bank of shunt capacitor values from 18 to 2090 pF in 15 pF steps. This is followed by a pair of motor-driven 0.1 to 28 µH roller inductors. To aid in low frequency operation there is a giant 0.1 to 84 µH motor-driven rotary inductor which may be set to include a pre-set inductance, the entire inductor or removed from the signal path. Last in line is an RF voltage sensor which controls onboard 6 kv and 7.5 kv warning lights. A 7.5 kv voltage at the output is considered a fault condition since as there is a 7.5 kV spark gap at the output connector. This voltage level is also considered the maximum allowable voltage in the unit before internal arcing can occur.
The recommended 200 watt tune up signal can be reduced by using a lower range relected power meter on the input. Initial matching settings are easily accomplished by following the step by step instructions printed on the inside of the cover. The manual for the unit includes preliminary settings for 25 foot, 32 foot, 35 foot and 80 foot vertical antennas as well as 75 foot and 150 foot longwire antennas. The final settings can be recorded on the inside cover for future reference.
This unit is designed to operate with any number of the Scientific Radio Systems transceiver/amplifier combinations. It can readily be adapted to other units by use of a simple 1 of 10 grounding switch for band selection. Also available is a key-inhibit signal which shuts down the transmitter when capacitors are being selected during initial setup and when the unit is changing bands/channels. Also available is a 'status' line which is used to key the transmitter when in the tune mode. A 19 conductor cable is required to fully utilize all external lines/signals available as well as power to the unit. Eleven conductors plus AC power is all that is required if optional signals are not untilized. The unit requires 115 / 230 vac power.
All this is contained in a 20" x 24" x 9-1/2" aluminum enclosure with hinged, weather-proof lid. Four mounting tabs on the back of the enclosure facilitate mounting. Provision for a padlock is included. Power and control signals are applied via 19 pin MS3102 connector (mating cable-end connector provided). AC power may be supplied via separate cable through its own entrance. RF in is via an N female connector and the output is on a 2-1/2" ceramic feed-thru on the top. Setup / troubleshooting / operating manual included with full schematics and parts lists. Weight 50 lbs.
(EQP) SR-640 Another of our SRS acquisitions.
Factory rated at 100 watts continuous, 200 watts peak. This
was the latest automated design fixed channel tuner SRS produced.
Forget the minimum RF power requirements and minimum antenna length requirement of the automatic antenna tuners. Also, most of them have a maximum SWR mismatch, over which they do not operate. This tuner lets you set and control the match with no sensitive microprocessor that could fail and put you off the air.
This programmable, broad-banded full range HF tuner incorporates a motor driven roller inductor and switched fixed capacitors for 10 preset frequencies. It is desgined to operate with the SR 206/210 series transceivers and the solid state SR-240 transceiver. External switching control is available by grounding 1 of 10 selected channel lines. Also includes an optional 'key-inhibit' signal (line goes high) to disable the transmitter during switching.
Selection of a preset causes a motor-driven rotary switch to select a combination of fixed capacitors determined during initial setup of the unit to provide a match for the antenna. The switch also selects a trimpot that was set during setup to position the rotary inductor for best match. Once the unit stops switching the key inhibit line resets, enabling the transmitter.
Input to the tuner passes through a 4:1 balun, transforming 50 ohms to 12.5 ohms to assist matching very short antennas. Capacitor selection is via an ingenious mechanical switching arrangement allowing series values from 4 pF to 1020 pF in 4 pF steps, a fixed shunt value of 500 pF and an optional series 200 pF after the roller inductor. The 0 - 18 µH roller inductor is shunted across the output.
Setup is performed by switching the internal logic to 'Tune Mode' and manually selecting capacitor values and roller inductor position for best match. Once this is achieved, the rotary switch is 'programmed' to select the capacitors and an onboard trimpot is adjusted to position the rotary inductor for best match. An onboard SWR bridge / power meter is used for the tune-up process. A 'typical tuning data' chart is provided as a starting point to preset capacitor and inductory values for 10 different vertical and horizontal antenna lengths.
A maximum 15 conductor cable is required for control. This could be reduced to 9 conductors by building a BCD to Decimal decoder in the unit. Compare with the 'automatic' unit that is a transformer and resistor connected between your rig and the antenna. Our unit uses real individual matching parts worth over $100 more than our asking price.
We can provide full "Theory Of Operation" specifications prior to purchase for your perusal. 18 vdc control voltage required. Designed to use 8' to 75' radiator. Our units were completed and tested at the factory. 6" high x 12" wide x 14" long rain tight enclosure has "UHF" connector input and a beehive insulator on the antenna side. The lid has O-ring weather seal. 18 pounds.
Copy of a full factory manual included with purchase. 1981 SRS price was $1,320.
Surplus Sales special introductory price...
Scientific Radio Systems
Antenna Coupler Case & Parts
(ENC) SR-640P Like SR-645, this is mainly a rain-tight antenna coupler enclosure, but has some parts pre-assembled not completed by the factory. It includes a motorized shunt with capacitor bank, transformer with a 2.5 amp fuse holder and switch, A rotron 115v cooling fan and baffle, SR-645 watt meter w/ 200, and 1000 watt scale. 20" x 24" x 9-1/2"D.
(EQP) SR-610MF 10 channel medium frequency
couplers require a Radio Switch Model 86 2 pole 11 position
ceramic switch (available elsewhere in this catalog) to be 100%
complete. This switch is motor driven and selects various coils
and capacitors to achieve resonance. 12 vdc or 24 vac control
Our units were completed
and tested at the factory, then the switches were borrowed.
Factory rated at 150 watts continuous. 6" high x 12"
wide x 14" long rain tight enclosure has "UHF" connector
input and a beehive insulator on the antenna side.
The lid has O-ring weather seal. 27 pounds.
Copy of a full factory manual included
with purchase. SRS price over $3,000. Surplus Sales special
Frequency Antenna Coupler Includes Radio Switch 3P11T
(EQP) SR-610NDB Made for the Federal Aviation
Administration, these 10 channel medium frequency couplers are
ready for immediate use.
encapsulated Hi-Q toroidal inductors are selected by a huge
motor driven Radio Switch Model 86, 3 pole, 11 position ceramic
switch. 12 vdc only operation.
Parts included in this tuner:
• Arco 315M 1200-2500 pF 1kv ceramic trimmer - 10 pieces
• BW coil clips with 8" HV lead - 10 pieces
• 20 µH molded toroidal inductor 100 watts - 24 pieces
• BW 1611A 2 X 20 µH 2" x 2 1/2" mini-ductor, both on fiberglass mounting board - 1 piece
• Radio Switch 88-11-3/3 3 pole 11 position switch
• 12 vdc motor to drive the switch
• 21772 2" ceramic feedthru insulator
• 600 KHz low pass filter, 100 watt rating - BNC female in/out
• Stahlin J1412W polymer impregnated fiberglass enclosure
• Plus miscellaneous hardware and wiring
Our units were completed and tested at
the factory. Factory rated at 150 watts continuous. 6"
high x 12" wide x 14" long rain tight enclosure
has "UHF" connector input and a beehive insulator on the antenna
side. The lid has O-ring weather seal. 27 pounds.
Copy of a full factory manual included
with purchase. Call Surplus Sales for special introductory
(ENC) SR-645 Scientific Radio SR-645 antenna coupler rain tight case. Great for outdoor antenna tuner or switch. Hinged lid with gasket. Four threaded inserts heli-arced to back for interior mounting. Four slotted tabs on outside for mounting to a surface. Four pre-drilled holes on ends for connectors. Solid aluminum for light weight. Seven stainless steel clips secure the lid. Provision for padlock on lid. Holes: Bottom end: 1-1/4", Two holes 9/16", 3/16", Top: 2". Measures 20" x 24" x 9-1/2".
SRS SR-645 Antenna Coupler
Rain Tight Case (cont'd)
(ENC) 652203 Scientific Radio SR-645 antenna coupler rain tight case same as left except case measures: 20" x 24" x 11-1/2".
(ENC) 652203A Scientific Radio SR-645 antenna coupler rain tight case same as left except case measures: 20" x 24" x 13-1/2".
(ENC) 640103 Scientific Radio SR610/640 antenna
coupler raintight case. Great for any outdoor tuner or switch
application. Removable lid with o-ring gasket. 6" high
x 12" wide x 14" long. Several pre-drilled factory connector holes.
Gray plastic / fiberglass material. Mfg: Hoffman.
(ENC) J1008S Scientific Radio SR604 antenna coupler case. Fiberglass reinforced polyester enclosure with watertight cover. Molded in flange for ease of mounting. Hole on one side for ceramic insulator mounting. Holes in other side for SO-239, ground and 1-7/16" diameter connector. Great for 100w remote antenna tuner. Made by Stahlin.
(ENC) 680022-01 Scientific Radio SR-680 antenna
coupler rain tight case as incorporated above. Great for any
outdoor tuner or switch application. Removable lid with o-ring
gasket. 8-1/2" high
x 15-1/4" long x 12" wide. Several pre-drilled factory
connector holes. Gray plastic / fiberglass material. Mfg: Hoffman.
(RF) LCNW An amazing switchable RF output
network in a PI configuration. The input passes through 26 values
of "C" , each switched in or out with a Jennings vacuum
relay. After this network, 13 values of "C" are individually
switched to ground. Off of the same output buss 16 values of
"L" are switched to ground with
Jennings vacuum relays.
*** SOLD OUT ***
Motorized Rotary Inductor
635-9851-004 Collins / Rockwell motorized rotary
inductor. 25 µH. Brand new in the box. Handles 500w to 1 kw.
1/8" diameter gold plated inductor.
vdc motor drive. 20k, 10 turn pot attached for high resolution
position indication. Maximum dimensions 6-3/8" high x
5-1/4" wide x 8" long. Complete with Collins acceptance
Antenna Tuner Relay Board Made for Scientific Radio Systems 680 Tuner
(EQP) 680330 Antenna tuner relay board. 3 SPST "clapper" relays rated at 5 kv, 5 amp, all run on 24v DC. Includes 6 disc caps, 100 pF @ 5 kv, NPO plus 1 amp 200v diodes and .01 µf 50v disc caps on all coils. Good for switching resonant counterpoise, antennas, etc. Documentation included. Made for Scientific Radio Systems 680 tuner. 5-1/4" x 5-3/4".
*** SOLD OUT ***
Collins 100 watt & 1000 watt Forward & Reflected
Collins 100 watt and 1000 watt forward and reflected power meter. 2 - 30 MHz. Includes Collins 542-4116-004 directional coupler, 458-0388-00 3" square wattmeters, phenolic rotary switch with knob to select meter scale and a ceramic rotary switch to select an antenna or dummyload. These parts come attached to a Collins 180T-2 remote control unit for an antenna coupler, better known as an SRA-22. The wattmeter parts are all there and connected together. Cut off the end of the SRA-22 for the front panel for your wattmeter. You can also remove the parts without disturbing the wiring and mount them in another cabinet. These parts are what make up a Collins 302C-1 or 302C-2 wattmeter, less the case. Order (EQP) SRA-22#1 or (EQP) SRA-22#3 below.
Antenna Coupler Control Head for
SRA-22 Remote Tuner
SRA-22#1 Collins antenna coupler control head for SRA-22 remote tuner. This is a complete tuner controller and directional watt-meter for your own remote tuner. A tremendous value. Made to swing mount in a 19" rack. Unit measures: 5-1/16" high x 8" deep x 18-1/2" long. 21 lbs. Used, surplus, fair condition. Sold as is. Unit Includes:
• 27 vdc, 0.5 amp power supply
• Collins directional coupler with "N" connectors
• 0 - 100 / 0 - 1000 watt-meters to go with directional coupler
• Phenolic rotary switch for forward & reflected range
• Ceramic switch for selecting antenna or load
• Dual transformer, independent 115 vac primaries,
30 vct @ 0.5 amp secondary
• Aemco 83-3277 coaxial relay. 600 watts, 2 - 30 MHz
• 28 vdc. SPDT with "N" and "BNC" connectors
SRA-22#3 Same as above except missing the 83-3277 coaxial relay. Mount an "N" double female bulkhead connector on the back panel to mate with the "N" male pigtail from the switch and you're ready to go. Same fair condition as SRA-22#3.
*** SOLD OUT ***
Antenna Coupler Includes Radio Switch 3P11T
(EQP) SR-650 Not complete, but these 10
channel couplers are built for stout. Dual 11 µH 10 amp motor
driven Johnson roller inductors fine tune rough tap selections
(of a 25 µH coil, available separtely for $95) by a huge Radio
Switch Model 86, 3 pole, 11 position ceramic switch (included
here and can be found elsewhere in this catalog for $269). This
switch / inductor circuit is similar to that found in Scientific
Radio's SR-110 Amplifier, available elsewhere in this site.
115 vac, 1 amp control current. Circuit is factory rated at 1,000
watts continuous. 11" high x 17" wide x 21" long.
An original factory enclosure is available for $250 extra. 10
channel control cards are available for $75 each. Copy of a
full factory manual included with purchase. SRS price was $2,599.
Surplus Sales special introductory price...
(EQP) DAUMA-10F Includes: one 200 pF, 4 kv air variable
capacitor, one 500 pF, 1.5 kv differential air variable capacitor.
12 vdc drive on each cap. Limit switch both drives.
One 10 turn, 1/4" diameter silver tubing, 3" outer diameter tapped coil.
Fan 100 vac cover interlock. "N" RF in feedthru terminal RF out.
DB plugs for control, interlock, detector, V out.
Enclosed aluminum box 13-1/2" x 15-1/2" deep x 6" high.
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