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The current version of the SG-235 coupler will have a revision letter located

on the printed circuit board. To continue moving forward in coupler design,

the SG-235 may be revised as needed. Later revisions of the coupler will be

denoted by the subsequent letters of the alphabet.  The SG-235 contains all the

latest revisions of the standard SG-230PRO to ensure the user is acquiring all

the benefits of the SG-230PRO along with the added benefits of the SG-235.

SGC will continue making incremental improvements in the Smartuner prod-

uct.  When you buy your product today and a new feature is added, you can

always upgrade for modest fees to the latest version of the unit. If you would

like to upgrade to the latest version of the unit, contact SGC because special 

discounts are always provided to our valued customers.

15

© 1998 SGC Inc

SG-235 Manual

SGC Inc. SGC Building, 13737 S.E. 26th St.  Bellevue, WA   98005 USA

P.O. Box  3526, 98009  Fax: 425-746-6384  Tel:  425- 746-6310 or 1-800-259 7331 

E-mail: [email protected]   Web site: http://www.sgcworld.com

Summary of Contents for Smartuner SG-235

Page 1: ...SG 235 Smartuner Microprocessor Controlled Automatic Antenna Coupler Installation and Operations Manual Getting the most from every watt of HF SSB Power...

Page 2: ...mphasis on providing quality equipment which remains rugged reliable and competitively priced We are focused on providing customer service of the highest standard Our commitment is to product training...

Page 3: ...3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site http www sgcworld com C CA AU UT TI IO ON N Carefully read the Quick Start on the fol lowing page and a...

Page 4: ...mended 4 Tuning is done at a maximum of 100 watts Once radio is tuned the Gray wire transitions from 5V to GND and acts as a switch to turn on a 500W linear amplifier N No ot te e C Co ou up pl le er...

Page 5: ...Support 17 4 0 Antenna Types 19 4 1 Selection 20 4 2 Whip Antenna 2 5 3 0 METERS 20 4 3 Whip Antenna 7 0 8 5 meter 23 ft 20 4 4 Longwire Antenna 23 meter 75 ft 46 meter 150 ft 20 4 5 Backstay Antenna...

Page 6: ...2 Coupler Configuration 51 8 3 Tuning Process 51 8 4 Impedance Detector 52 8 5 VSWR Detector 52 8 6 Phase Detector 52 8 7 The Control Device CPU CENTRAL PROCESSING UNIT 53 8 8 Initialization 53 8 9 I...

Page 7: ...64 11 3 Transmitter Faults 66 11 4 A Final Pointer on Troubleshooting 67 Warranty Information 68 Schematics Appendix QMS System QMS Brochure SG 500 SmartPowerCube Brochure 7 1998 SGC Inc SG 235 Manual...

Page 8: ...the performance of your HF system 1 1 1 1 E Ex xp pe er ri ie en nc ce e L Le ev ve el ls s o of f U Us se er rs s The Smartuner may be installed successfully by anyone who follows the instructions in...

Page 9: ...r than the antenna The antenna wire should be of the largest gauge practical Capacitance at the coupler output must be minimal The antenna must be of sufficient length for your lowest operating freque...

Page 10: ...es and achieves a new tuning solution This new information is stored to memory for future reference Important the Smartuner will always look for the best possible tuning solution and will improve exis...

Page 11: ...C Co on nf fi ig gu ur ra at ti io on n The coupler network configuration is designed with 64 different input capaci tor values 32 output capacitor values and 256 inductor values thus providing about...

Page 12: ...is solidly built good installation practice calls for additional protection from the elements SGC makes the following recommendations 1 1 6 6 1 1 M Ma ar ri in ne e M Mo ou un nt ti in ng g The Smartu...

Page 13: ...ovided by the QMS Quick Mounting System which keeps the antenna coupler outside of a vehicle Temperatures inside a vehicle may exceed 212 F 100 C If a QMS is not used keep the coupler in the shade if...

Page 14: ...uation to under 1 dB per 100 feet at frequencies below 30 MHz You should be aware that this heavier cable is less easy to work and may be quite expensive The second loss which must be considered is th...

Page 15: ...e benefits of the SG 230PRO along with the added benefits of the SG 235 SGC will continue making incremental improvements in the Smartuner prod uct When you buy your product today and a new feature is...

Page 16: ...e 45 to 55 ohms VSWR Typical Typically less than 1 4 1 DC Input Requirement 13 6VDC DC Operating Range 10 5 to 15VDC Input Current Average 9 amps Random set time Typical less than 2 seconds Recurrent...

Page 17: ...es to think through your installation and ask if there is anything obvious which you have overlooked in the installation Check to make sure your ground system is both adequate and tight and that prope...

Page 18: ...u are having a problem determine if it is happening all the time or only part of the time Does the problem occur only on certain frequencies Does the problem only happen in certain modes This type of...

Page 19: ...ced antennas such as whips and long wires The radiating portion of the anten na is connected directly to the tuner through a high voltage insulator It is extremely important that the antenna type site...

Page 20: ...ance when compared with the longer antennas A special high performance 9 foot antenna the SG 303 is manufactured by SGC specifically for this problem The SG 303 is SGC Part Number 55 27 4 4 3 3 W Wh h...

Page 21: ...00 KHz 4 4 6 6 B Ba ac ck ks st ta ay y A An nt te en nn na as s 8 8 m me et te er rs s 2 28 8 f ft t a an nd d l lo on ng ge er r Although we would love to sell everyone a high performance marine whi...

Page 22: ...al ll la at ti io on n SGC Inc SGC Building 13737 S E 26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site http www sg...

Page 23: ...n 23 1998 SGC Inc SG 235 Manual SGC Inc SGC Building 13737 S E 26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site ht...

Page 24: ...ox 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site http www sgcworld com 1998 SGC Inc SG 235 Manual Coupler 7 to 25 meters 1 m e t e r 3 meters Hot G N...

Page 25: ...tall as possible to provide the antenna with the greatest isolation from industrial noise generated by the building such as fluorescent lights and electrical motors Loop antennas are also less suscept...

Page 26: ...performance Note that with this type of antenna the coupler may be mounted in the middle of the horizontal portion of the loop or it may be mounted at the corner If mounted at the corner and the lead...

Page 27: ...though not our best recommendation this antenna will provide a workable solution in some installations F Fi ig gu ur re e 5 5 1 11 1 V Ve es ss se el l i in ns su ul la at te ed d b ba ac ck ks st ta...

Page 28: ...iple wire loop 6 loops on a rectangular configuration 3 by 4 feet be installed as illustrated in the figure below This configuration allows operation from 3 0 to 30 MHz and the SG 235 will tune and lo...

Page 29: ...cost antennas and both configurations end fed or loop antennas can be used 29 1998 SGC Inc SG 235 Manual SGC Inc SGC Building 13737 S E 26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 638...

Page 30: ...l with a shunt fed antenna This is generally a 23 foot piece of metal which mounts on the fuselage of the aircraft and is grounded to the air craft at one end The device looks something like a towel b...

Page 31: ...hat long range HF communication is in process The second class of covert antenna user and a larger group is the amateur radio community which finds itself more restricted almost daily by covenants bui...

Page 32: ...all work well at higher frequencies and provide some directional characteristics These antennas are also less prone to man made noise H All types of antennas may be hidden inside the roof of a buildin...

Page 33: ...tenna supports All it usually takes is several hundred feet of rope and some creativity Here are some examples to consider If you wonder which structure would work best remember the one with the great...

Page 34: ...most big city building codes 6 Underground metal petroleum storage tanks At the gasoline station 7 Metal fencing of any type A barbed wire fence along a pasture under telephone pole 8 100 feet of wire...

Page 35: ...the antenna can be made a little shorter or longer to overcome the tuning hole on the frequency band you may have wanted to use 5 Always install the antenna system as far away as possible from any el...

Page 36: ...discuss the three steps mentioned above in detail and will provide sufficient information to enable the user to confidently install a complete system properly The antenna system is a key part of the c...

Page 37: ...addition the V antenna is a compromise between vertical and horizontal polarization and will give good results for communications with land or marine mobiles using vertical whip antennas 7 High voltag...

Page 38: ...nstallation practice Although this is tedious work the benefit is that once completed you will have a much superior radiated signal and lower noise floor on receive 6 6 3 3 2 2 M Ma ar ri in ne e G Gr...

Page 39: ...be What you are trying to do is make a large capacitor to the sea water Consider the salt water of the sea to be one plate of a capacitor the ground system the other and the hull to be the dielectric...

Page 40: ...be con ducting surface extending several wavelengths in all directions around the antenna On a rooftop this situation may be approximated by placing a screen of chicken mesh copper hardware cloth or...

Page 41: ...e with solid insulation may be used if the outer shielding is removed A protective housing is highly recom mended when the coupler is installed on the outside or on the deck 6 6 6 6 A An nt te en nn n...

Page 42: ...Audio input output and PTT line J 503 Remote control head or multiple head junction box J 504 Remote control head or multiple head junction box Head mounted on radio is normally connected here Ext SPK...

Page 43: ...ching During tuning the amplifier is in by pass operation indicated by a 5V on the gray wire Once the coupler is tuned the gray wire is pulled to ground and the amplifier is switched on Manual amplifi...

Page 44: ...ions are firm and no wiring remains exposed A schematic drawing is provided as an aid to understanding the operation of the SmartLock Pro S Sm ma ar rt tl lo oc ck k P Pr ro o S Sc ch he em ma at ti i...

Page 45: ...nstaller S SE ET TU UP P F FO OR R E EL LE EC CT TR RI IC CA AL L C CH HE EC CK K O OU UT T 8 8 0 0 E EL LE EC CT TR RI IC CA AL L C CH HE EC CK KO OU UT T After the SG 235 antenna coupler has been in...

Page 46: ...ave been successfully performed The SG 235 will probably not be supplied from SGC with memory data appro priate to your installation and the memory feature may not seem impressive at first Allow the S...

Page 47: ...n ideal load for the trans mitter and the SWR protection circuitry in the transmitter will automatical ly reduce transmitter power If the lamp does not light on any frequency there is high probability...

Page 48: ...t you will need to make arrangements to have the unit serviced 6 If transmitter output is good but the coupler does not tune up the lamp you should contact SGC for help I If f y yo ou ur r e eq qu ui...

Page 49: ...o o T Te es st t P Pr ro oc ce ed du ur re e 1 Connect AC to UHF Connector Cable to SG 2000 RF IN OUT Connector 2 Screw light bulb into AC Adapter 3 Plug AC Adapter and light bulb into AC to UHF Conne...

Page 50: ...radio and disconnect antenna from coupler 2 Connect AC to Alligator Clips Cable to the SG 235 antenna jack 3 Screw light bulb into AC Adapter 4 Plug AC Adapter and light bulb into AC to Alligator Clip...

Page 51: ...l to the amplifier J3 is for RS 232 connection to control the tuner remotely with a PC 8 8 3 3 T TU UN NI IN NG G P PR RO OC CE ES SS S An array of detector devices in the SG 235 monitors the antenna...

Page 52: ...ltage from the summing network The summing network output is shifted to a 0 to 5V range then fed to the processor s A to D converter ports and used within the microcontroller 8 8 5 5 V VS SW WR R D DE...

Page 53: ...applied RF frequency This non volatile memory table is the basis of the exclusive learning feature of the SG 235 After it has stored and latched the network status the CPU waits for RF to cease trans...

Page 54: ...the waterproof seal is carefully placed prior to refitting the coupler cover Setting JP2 to the Y Y E E S S position is recommended if you are using a radio for split band communications for scanning...

Page 55: ...mpling VSWR to determine if the coupler should re tune frequency comparison is employed causing the coupler to tune when the transmit frequency changes independent of the VSWR reading Extensive tuning...

Page 56: ...es the processor registers in accordance with the hardware All tuning elements are then removed and the tune indicators are turned off At this time the computer reverts to a sleep mode awaiting RF pow...

Page 57: ...be removed and the tuner will go into a 20 second time delay During this time delay the transmit frequency is monitored Should a change in frequency occur the tuner will revert to the beginning of th...

Page 58: ...in 125 h steps each time normalizing the input impedance with input capacitance 4 When the VSWR goes below 4 1 the computer will retain the data it determines is less than 2 1 until input impedance i...

Page 59: ...ormally the case Further detailed description however is beyond the scope of this publication The actual program is copyrighted and is not available 9 9 5 5 J J 2 2 T Tu un ni in ng g e el le em me en...

Page 60: ...viously been memorized in this mode Obvious disadvantages include a difference in frequency too small for the computer to detect This would result in recall of valid data that may not necessarily pres...

Page 61: ...ler is locked on the cur rent setting R R e e s s e e t t Pushing the red reset button allows the coupler to be reset This is preferable to the other method of turning the input power off and on 1 10...

Page 62: ...e on your computer by running the setup file 2 Connect cables to the coupler PC and radio 3 Turn on power to the coupler and radio 4 Coupler should come up in the bypass untuned state 5 Double click t...

Page 63: ...ically smaller than the antenna the system may load upside down where the antenna acts as the counterpoise and the counterpoise radi ates When this condition occurs the operator may encounter RF Bites...

Page 64: ...nce So much for a good ground 1 11 1 2 2 A An nt te en nn na a F Fa au ul lt ts s The key to getting the most out of your Smartuner is to realize the antenna begins right at the high voltage screw on...

Page 65: ...a grounded cabin you will begin to lose performance A good rule of thumb is that under one foot of feed line is a good installation one to two feet aren t very good installations and over two feet mea...

Page 66: ...but will not tune correctly when the desired radio is in place The coupler finds a tuning solution as indicated by the remote tune indicator going on but then resumes hunting In a majority of cases t...

Page 67: ...t which will give outstanding performance If you have a problem with the coupler finding a tuning solution you should change one variable at a time 67 1998 SGC Inc SG 235 Manual SGC Inc SGC Building 1...

Page 68: ...procedures described in the operating instructions b has been serviced adapted or modified without written approval by SGC or c is improperly installed used or otherwise damaged including without lim...

Page 69: ...69 1998 SGC Inc SG 235 Manual SGC Inc SGC Building 13737 S E 26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site http...

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Page 73: ...urchased in a package configuration please refer to the coupler and antenna manuals for their packing lists of the items supplied QMS Installation Instructions The QMS Quick Mount System antenna and c...

Page 74: ...r d de ec ck k o of f a a s se ed da an n SGC Inc SGC Building 13737 S E 26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com W...

Page 75: ...enclosure mounts in virtually any attitude and the straps can be moved to either side of the enclosure to accommodate the vehi cle see Figures A 1 A 2 and A 3 for typical installations F Fi ig gu ur...

Page 76: ...26th St Bellevue WA 98005 USA P O Box 3526 98009 Fax 425 746 6384 Tel 425 746 6310 or 1 800 259 7331 E mail sgc sgcworld com Web site http www sgcworld com 1998 SGC Inc Appendix QMS System SHEETS OF P...

Page 77: ...r clip which secures your SG 303 antenna when not in use mount the unit in a location where the tip of the SG 303 antenna is easily accessible for threading through the O ring Failure to thread the SG...

Page 78: ...nnection to the battery system of your radio use a heavy gauge wire not less than six gauge Never use your chassis ground return for your negative line connection D Do oi in ng g s so o w wi il ll l c...

Page 79: ...devices incorporated into the QMS it is important to observe two important rules Surfaces must be cleaned prior to installation to prevent scratching Surfaces must be protected during removal to prev...

Page 80: ...wn The vehicle should move up and down but the QMS should not If the QMS moves and the vehicle does not increase the tension on the QMS straps R Re em mo ov vi in ng g t th he e Q QM MS S Wash the veh...

Page 81: ...i in ng g Y Yo ou ur r Q QM MS S To store your QMS unit for long periods of time apply a thin coating of talcum powder to the suction cups This treatment increases the life span of rubber products A 9...

Page 82: ...7 SGC Inc QMS b2 cat 55 47 includes the SG 230 200W 1 8 to 30 MHz SG 303 9 ft antenna QMS b3 cat 55 48 includes the SG 235 500W 3 0 to 30 MHz SG 303 9 ft antenna QMS a7 cat 55 49 includes the SG 231 1...

Page 83: ...exterior QMS mounting package comprise the QMS Mounting coupler and antenna outside the vehicle reduces engine noise and interference It can be quickly installed and easily moved from vehicle to vehi...

Page 84: ...y the most durable electronic components and assembly techniques In real world applications it s nearly indestructible It s also very compact taking up less than 1 cubic foot of space Considering how...

Page 85: ...84 E mail SGCMKTG aol com Web site http www sgcworld com Copyright October 1997 SGC Inc No Compromise Communications Full 500 watt output The SG 500 produces enough power to be within 1 S unit 3dB of...

Page 86: ...h h e 7 e 3 7 0 M I 0 M I 4 0 4 0 M I 0 M e I M e I M f I 4 0 M I M I e I M e V M I M I M f h g f 7 0 4 1 e f 5 5 h e g e N g N N N H N h g f h e g N H H h e L g e h h g f h e g h e K f e h h g f 6 K...

Page 87: ...tomat ically reselects those values in less than 10 ms each time you select that frequency Flexibility is a key feature It is available with a number of attractive options including a shock mount for...

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