Harris FM-25K Скачать руководство пользователя страница 1 | Manualshive

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Содержание FM-25K

Страница 1: ...ris service personnel Also included is some of the life history of the FM 25K transmitter and concise information about updates This information is grouped alphabetically by section and then alphabeti...

Страница 2: ...to phase balance and phase sequence Its contacts can be wired to interrupt the blower contactor circuit if there is a detected AC phase problem We recommend that the phase monitor relay be installed w...

Страница 3: ...Lh e unit to light t he led Cha nge t h e ph ase r ota ti on by wapping any two of t he 3 ph ase wirPs to the monitor re lay 3 6 J I ot co n necte d 7 J No l used j Connel lo wirP _ j N 0 8 ______ aft...

Страница 4: ...e l cornplelely 0 1 insulai ed from other surfaces AC Controlln Phase Monitor Relay l o T7 te mm d J 1 2 C 011111 1 I lo 1111e 3H IPIHOH cl f1nm T7 J R3 Momit I he Phase Mnnit o r ffr Jay IH rP about...

Страница 5: ...ust below the cavity shorting deck You can make a crude manometer by forming some clear plastic tubing in the shape of a U Use enough tubing so that you have a vertical length of about 6 inches per si...

Страница 6: ...is operation on a standby AC power generator that is unable to handle the normal full power load of the transmitter There are various ways to do this each with their own advantages The best in terms...

Страница 7: ...veral parts are often required If you have a need to change frequency we can work up an information packet for you This packet includes a list of components to change a procedure and some target value...

Страница 8: ...ed from another This produces an in band difference signal For example suppose there are two stations in close proximity and one station is on 100 1 MHz and the other is on 100 9 MHz The transmitter o...

Страница 9: ...ion This will reduce the Plate Voltage to about 5300 volts which will be a major step in reducing the power and maintaining good performance See the attached drawing of the Wye and Delta configuration...

Страница 10: ...ts in lowp r output Using lower uu1nberecl prirnary tap settings r e rn lt s in high er voltage nut put HV Power Supply Dash pots magnetic overload relays A small bottle of lightweight oil is supplied...

Страница 11: ...they will otherwise still be in circuit HV Rectifier Testing 384 0650 000 Usually when a HV rectifier fails it goes to a shorted mode that is easy to identify with an ohmmeter Good rectifiers usually...

Страница 12: ...Combiner Re solder as needed with the coaxes disconnected Since the 8 Port Combiner is symmetrical it does not actually matter which coax is on what connector They may be connected in any order which...

Страница 13: ...m has glass that has turned foggy chances are it has failed Also inspect for any other components that may have over heated The IPA LPF DC is a 50 ohm device on its input and output Therefore the inpu...

Страница 14: ...ent readings are balanced IPA Oscillations Symptoms of instability of the IPA section will show up in the IPA reflected power reading You will find that the reflected power reading will move in abrupt...

Страница 15: ...atts of power is available with no more than 15 watts input Power output is controlled by drive from the exciter The amplifier is internally protected against overdrive over current and VSWR condition...

Страница 16: ...contact will affect the result and cause LS to over heat It is fairly unlikely that you will have to do any adjustment of LS unless you are changing frequency Cavity Cover Fasteners 448 0896 000 All f...

Страница 17: ...0473 000 Hose clamp 2 25 max 1 358 0935 000 Hose clamp 1 25 max 3 414 0279 000 Ferrite beads 3 516 0235 000 Feedthru caps 1000 pf 8 822 0506 002 Blocker plates 4 822 0507 002 Teflon washers 4 829 8597...

Страница 18: ...00 26 0 I _ I I I I _ I I I 1 1 I I I I 0 Filament metering board not shown 917 0570 001 Ferrite beads 414 0279 000 3 Feedthru capacitors 3 516 0235 000 Hose clamp 358 0473 000 Air feedthru 939 8208 0...

Страница 19: ...t the harmonic frequencies This difference in impedance affects the dB relationship For the effects on the directional coupler it would be best to re locate it so that it is on the output side of the...

Страница 20: ...Side Assy Cavity 1 9294931001 Side Assy Cavity 1 9434754026 Rear Wall Of Cavity Compatible With 9220446013 1 9294934001 Front Wall 1 9170432001 Anode Connector 1 4100153000 Insulator Bshg NS5W 4104 1...

Страница 21: ...1078001 Strap 2 9298607001 Short Upper Filament Cables 2 8298597001 Stud Feed Thru 2 8298596001 Bushing Feed Thru 2 8298595001 Washer Feed Thru 3 4140279000 Toroid 10mhz 300 OD 2 4140138000 Toroid Fer...

Страница 22: ...amp 929 94G 001 Cavity e Plate Blo cker 92 41 29 001 I Screen Arc Gap Ascwm bl_y new verc ion shown 22 avily Wall 94 3 4754 0 2 3 3h odi ng Ring D 29 398D 001 J Im e Cla rnp i s 1 o rn ooo PA Access C...

Страница 23: ...I O PA Coupling versus Tuning MoclifiPC Hose clamp 929 7946 00 l Clamp should be even with the bott 0111 of the c ontact finger _ l J 97 At times a transmitter problem becomes compounded by improper s...

Страница 24: ...tial setting in the unloaded condition PA Shorting Deck Adjustment The shorting deck referred to here is what sets the height of the cavity This is a frequency determining adjustment and you should no...

Страница 25: ...it would be a good time to consider retrofitting your transmitter with the gear type drive The gear type drive is covered in detail in service bulletin FM 392 However if you would like to just replac...

Страница 26: ...ld t hem in po it ion n ntil he arlhe ive cure about 24 hour RPmove t ape aft pi ahP ivP c m p Note It ic rnfe to lUl n t he transmitter hac k on immediately following installation of t lw li Pc Howev...

Страница 27: ...thus improving the insulation between the stud and Kapton Screen Control Full Range 994 8955 001 When we introduced VSWR Foldback into the FM 25K we included a screen control variac that gave full co...

Страница 28: ...00 You will need 1 2 feet of each Screen Studs 817 1864 001 In early model FM 25K transmitters the studs that fasten the screen bypass capacitor together were threaded all the way through In some case...

Страница 29: ...1 I A P 11 1 l 1y 1 _ _I _ _ _ View I Set Aff Gap I fol 0 01 4 Roel to bJ aC ket Scn w JOO I57 l 000 l Split 312 004B 000 1 Flat 308 000Ci DOO 2 Nut 304 0 1 30 000 l I I Carbon Rods I _ _ _ ___ 917 lG...

Страница 30: ...1 0 0 Feedt hru lns ula t 01 I G1 id T11ning ScrPw 82 J 4104 0D l Tefl on Should er Wa be 817 0003 001 410 0152 000 1 1 Efl 410 0156 000 c rid Blocker Kapt on 8 rn C 74 2 oo t f Iw Y Filament Kapt n h...

Страница 31: ...i10 MPt i l Pa1 t 1 v _ i _ Coupling fl I0 27 l l 0 Ir1 00 Fine G1 icl Tunin g Bl oc k 9 17 0035 llll l Brass W asher tt DE 8 F I Y 101 ff I l Efl W le 81 7 0002 UOl Stud 81 7 JSG o ll ffi 191 01 tJ I...

Страница 32: ...irlnator c 0 0 Gri d In d uctor L4 8 J0 4G47 0U Ca th od e Inclncl o LB no part nm i be Two p os sible loc a1 i m s J7 Bia c Ch oke LI 484 00 j Fi la m ent By pass c 5lfi 0205 000 Bias Deco11pling R 3...

Страница 33: ...c ers 9 rn 421s 001 0 ffi 11 8 l7 0077 0ll 1 CJ 51G 04 3G Oll l I St rap 817 0 Ee e osorl Tile Ci 001 rid Contact R l in _J ijf 1 1 i 1g EB _ _ _ _ _ Insulators _ l 1 EB I 358 J G 3 000 410 000HOO _i...

Страница 34: ...3 001 Bn1ss WaslH J s 17 000 oo 1 Sueen C ont ae l Ring l3D S8DO OOI I 22_ Grid Contact Rinol OOJ ffi 1 t ffi In s11lalors 1 4 10 UOOJ OOO 1 1 ffi 11 1 1 1 l r 1 _ Ont er Filament 1 1 4 Wc 404 0688 00...

Страница 35: ...er Washers Grid And Screen 7 8170002001 Brass Washers Screen Grid Cap Mountinq 1 8170253001 Strap Cathode Inductor 1 8298567001 Anqle Spark Gap 1 9294684001 Filament Ring For Underside Not Fingerstock...

Страница 36: ...0104 1 4100152000 Insulator Bshq NS5W 4103 1 4100156000 Insulator Bshq NS5W 4203 1 4040689000 Filament Contact Assy Inner 1 4040688000 Cathode Contact Assy Outer 8 3540147000 Lug Shake 150 Mtq 8 35401...

Страница 37: ...ed in each location brass and stainless screws are not interchangeable Take care to avoid bumping or bending the neutralizing flag The blocker may stay clamped into the shorting deck and these two pie...

Страница 38: ...ters and transmitter clean During the first 100 to 300 hours of operation with a new tube the filament voltage should be set at the rated value 10 volts then lowered to nearly the minimum that can be...

Страница 39: ...t Voltage When the filament voltmeter is pinned negatively it is usually a sign that there is actually no filament voltage This is a characteristic of the RMS to DC converter IC U1 on the AC Control b...

Страница 40: ...e external Squelching of the STL or a strong glitch from the stereo generator can kick the exciter out of lock momentarily IPA VSWR Overload This indicates too much reflected power to the IPA IPA Lowp...

Страница 41: ...or Like the HV feedthru access to these capacitors is gained by removing the rear cavity wall Filter Capacitor Look for any signs that one of the insulated terminals on the top of the capacitor has fa...

Страница 42: ...nd is given If any are not high check each source of the voltage Typical causes are a shorted reed relay K3 or failed flip flop IC U3 or US AC Control Board If the Plate ON lamp is indicating correct...

Страница 43: ...ectifier Emergency Connection 11 HV Rectifier Testing 11 HV Shorting Solenoids 11 37 HV Supply Secondary Wiring 12 Incidental AM Bandwidth Considerations 7 Input Match 7 Interlock Switches 6 Intermitt...

Страница 44: ...l Range 27 Screen Overload 40 Screen Ring Fingerstock 27 Screen Studs 28 Sola Filament Transformer 28 Solid state relay K4 37 Spurs AM lntermod 8 Spurs FM lntermod 8 Spurs In Band 8 TPO Changes 9 Trou...

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