8589356947

Volume XLl

THE SHORT WAVE MAGAZINE

387

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Pictured left with its companion ATCS 144s controller isthe GFBA 144e high performance 'masthead' preamplifier for the 144-148 MHz amateur band. łt is un<jue in usmg a’noisetess‘ negative feedback Circuit (the result of severai months research at muTek) around a MGF 1202 gasfet - resulting in a combmation of very Iow noise figurę (typicaly <0 9dB) with qu«te outstandmg large signal performance (the input third order mtercept point is typicaBy around ♦ 14dBm!). Through power handling m the transmit modę is 1kW pep I50CW car ner) for vswr's of <1.1 1 and 500W pepOOON carner) for vswr = 201. The companion ATCS 144s controller allows preamplifier control with proper power ampkfier sequencmg and will interface with a u transcervers (that we‘re aware ofl) currently in use.

Need morę Information? — then an sae or ‘phone caB wiN do the trrck.

GFBA 144« (incl ATCS 144«) £ 129 90 inc. vet. p6p £250 ■

At the other end of the rangę (but manufactured with no less attention to detail) is our SINA I45sb Transcewer Optimised Preamplifier for the popular FT290transceiver. Fetting m the location occupied by the tonę squelch unit m some foreign models thie preamplifier will ensure an externaBy no«se limited recewer The use of an on-board antenna relay and the provisx>n of a variable output attenuator allow this level of sensitivity to be obtamed with a maumum of strong-signal performance degradation. The excellent bandpass filtering mcorporated in this design also results in very much improved image rejection and will elimmate much of the breakthrough from aucraft band which seems to plague some people.

The SLNA 145sb is suppfced complete with step by step fittmg mstrucnons and a h»gh-quality cable kit to simplify instaliation. It‘s not difficult to do but if you'd rather not attempt fitting yourself please contact Amateur Rado Exchange who are offenng a fitting service-

SLNA 146eb £27.40 inc. vat. p6p £120.

muTek limited - the rf technology company

Bradworthy, Holsworthy, Devon EX22 7TU (0409 24) 543

CRYSTALS MANUFACTURED TO

6to 9 999 kHz HC13 U £3280 lOto 19.99kHz HC13/U £31.00 20to 29.99kHz HC13/U £2308 Xto 59.99kHzHC13U £21.73 60to 79 99kHz HC13U £15 69 80to99.99kHzHCl3U £1208 100to 149 9kHzHCl3/U£11.32 150to 159.9kHzHC6rU £11.32 1G0to 399 9kHz HC6/U £7.83 400to 499.9 kHzHC6/U £7.00 500to 799 9kHz HC6/U £7.83 800to999 9kHzHC6U £11.01 1 Oto 1 499MHz HC&U £11.25

ELECTRONIC

SERVICES

2 ALEXANDEfl DfllVE. HESWAl L. WlflRAl. MERSE YSI0E..L61 6XT Telephone. [phone] TeW?x. 627371

PRICES EXCLUD€ VAT - U.K CUSTOMERS PLEASE ADD 15% VAT

ORDER TO AMATEUR SPECIFICATION

1.5 to 2.59MHz (fund) HC6^U    £5.36

2.6to 21 MHz (fund)HC6/U    £4 87

3.4to 3.99MHz (fund) HC186 2&U    £6.75

4to 5.99MHz (fund)HC186 25/U    £5 36

6to 21MH* (fund) HC6.186 2&U    £4 87

21 to 25MHz (fund)HC6. 18625/U    £7.31

25to 28MHz (fund) HC6. 186 26U    £9 00

18to 63MHz I30/TJHC6. 18625U £487 60to 105MHz(50£T)HC6. 186 2SU £5.61 105to125MH/(50/T)HC18625U £844 125to147MHz(70/TlHC186 26U £11.25 147to 175MHz(90/TłHC 18625/U £1266 17510 250MHz (90/TIHC186 26U £13.50

TOLERANCES: Upto80CkHz - Total toterances * 2 100pm 0*C to 4- 70°C.

Over 80CkHz - Adj. tol. - ± 2Ct>pm, Temp. tol. - * 30ppm - 10°C to 60°C. Unless otharwisa specified. fundamantals wil be Supplied to 30pf c*cuit conditions and overtones to series resonance.

DELIVERY: 1MHz to 105MHz - 46 weeks. other frequencies - 68 weeks. Prices shown are for "one off to our standad amateur specifications. closer toierances are ava>lable. Please send us dęta Is of your reguirements.

COMMERCIAL AND PROFESSIONAL CRYSTALS NEW FASTER SERYICE

We are now supplying crystals to most commercial and MIL specifications in th<? rangę 1MHz to 60MHz ordered in smali quantities withn 2V» weeks AT NO EXTRA CHARGE We also have even faster EXPRESS SERVlCE for that very urgent order We can also supply crystals for commercial applications e.g. Microprocessor, TV. etc., at very competitive prices. Let us know your needs and we will send you a quote by return, alternatively telephone or telex our Sales Engmeer Mr. NorcMfe who is normally ava«lable in the Office for technical enqu»ies between 4 30 and 6.33p.m.

DOUBLE BALANCED MIXER

We are now stockmg two new double baiance mixers which are pn compatible with both the MO 106 we used tostock and also the S8L 1, but have much superior specifications covenng 500kHz to 500MHz. The M8is hermetically sealed @ £7.83. The M 18is non hermetically sealed @ £6.09.

4 METRE. 2METRE AND 70CENTIMETRE STOCK CRYSTALS

We stock crystals for 70.26MHz on 4m. On 2n we stock ROthru R8andS l8thru S24. For 70cm we have RBO thru RB15 plus SU18 6 SU20. For fuli details of the above stock crystals plus detarfs of our Converter, Marker and Alternative IF crystals.crystal sockets and our AER1AL RANGĘ see August. 19B3 Short Wave Magazine page 294 or send SAE to the above addrass.

Train now for the Radio Amateur Licence examination. An exciting hobby which wili enabłe you to talk and listen to the whole world. No previous knowledge needed, only a few hours a week of home study for 3 to 6 months. We have successfully trained people over the past 40 years! Post coupon belowfor details or telephone [phone] (24hr service).

Bntish National Radio & Eledromcs School

Reading, Berks. RG1 1BR

I Name........................................

| Address ....................................... |

SWM/ft^:845 ’ ’ ‘ ’ _ _ _ _    ‘ BŁOCK ĆAPŚ PLEAŚE _]

STOCK CRYSTALS

CRYSTALS FOR 2 METRES

£1 96FORONECRYSTAL

TX CRYSTALS    «X CRYSTALS

44 MHz SERKSRES 44 MHz SERIES RES 1*15 MHz 206 30PF

HC6U 4 b 8 MHZ 3CPF MC2SU 12 MHz 30Et4CPf HC2S0J 18 MHz 25 b 2CPF 4 METRE CRYSTALS FOR 20 26 m MC*U AT CZ25 tach TX 8 78250 RX 29 7800 674666 70CM CRYSTALS (SOOpr w CZSOt^h

FocPyePFlPF2bPF70t«oęs WooC b Oouqb% tryj FOK Mu»t» \JU SU8<433 2 R80 R82 R84 R86 R810 RB11 R813 RB 14 R015 ALSO lor Mglt.UII SU 12 SU16 SU18 SU20 CONVERTER CRYSTALS IN HC18U AT (286 22000 38 666 70000 96000 101000 101 500 116000 FREOUFNCY STANDAROS €275t»c^

IN MC 13100kHz

MC6U    20OHz    450hz    1000Hz    3 SCMHz SOCMHz

MC 18 U    1000Hz    7 0CVMz    lOTCWHz    48 OCM Hz    lOOOCMMz

TONEBURST. l.F. 8 MFU CRYSTALS IN HC18 (225ŁACH 7.168 MHz Ifor 1750kHz Tooc) 10 246 MHz łf<y 1071 F )

12768    4 000    5 06888

YAESU CRYSTALS fo* FTtOTs FT901. tle (4 00#^

M®n>    t)c Stock. (A kst Ift tva4tbit on rtqc*fst - ps* SAE.)

A stirrpec    tnv#k)pt ALL tnouras otetto

ĘJuartSLab

QUARTZ CRYSTALS

(1.74WHEN 20RMORE PURCHASEO CHANNELS IM STOCK

R0TOR7.S11.S2OTOS23 R0T0R7. S8TOS23 ROTOR7. S8TO S23

MARK er INC LTD

MAOC TO OROER CRYSTALS

FUND A ME NT AL S			OVERTONES
EREOUENCY RANGĘ	PRlCE		F REOUENCY RANGĘ	PRlCE
6 TO 30Hz	£2300	>dOVT	21 00 TO 650CWHZ	€4 55
30 TO 80 Hz	0500	• 5rsOVT	00 00 TO HOCKiHz	£5 10
80 TO 1»Hz	£1050	5c^OVT	11000 TO 125CA^Hz	£7 00
100 TO 9»H/	£7 00	5Łh. Tth b	12500 TO 150Cf/H/	£800
1 TO 1 ^hz	£•0 75	91* OVT	15000 TO 250 0CMH/	£950
1 5 TO 2 5Mhz	£500
2 5 TO 4 OMhz	C4 7S	DELIVERY	2 0 TO 12SCNHZ 2T0 3w«~s
4 TO 21MH/	(455		10 TO 2 CMHz 3 TO 4 weoks
21 TO 2<Mhz	£6 50	.	Other fregoencVs 6TO 8 weeks
25 TO 3CMHz	(850

UNess otherwist rtoutstod    wmI be Suoo^d lof lotd c^o^ouoct ynj ovOftonts for **r*s

rtsor^^t Op^ratcn

HOLDERS PLEASE SPECłFY WHEN ORDERIMG - «»st HC2SU SuppiicO tof KTLS atx>ve 3MHz HC13U620OiHzHC6UbHC3au ITCkHz ITCMHzHC IftU b HC2SU 2 2SCMHz OlSCOUMTS: PrceondiJołKai-onlor 10^ units to same lreoL*ncy/spe< or    o* m,*«3

We    utai* for use rUK repealers

COMMERCIAL CRYSTALS: Av^itb*e onfastd*kver> aryjaico^>pctJtivcorxes    scwl lor li*lstatr>gint*rests

EMERGENCY SERV)CE for XTALS 1 lo 1?«MMz Add    so ch*'0e lor each XTAL Oays relcr CO wo»Osy*

4days+(12. 6davs^C7. 8davs4(5. 13davs^(3

CRYSTAl SOCKETS HC6 b HC25£0 20t^ MINIMUM OROER CHARGE (1 50

TERMS Cash with order post mc. to U K b Ireland Cheguts b P.O s to OSL LTD

lOOCMHz 10 700 MHz

ALL PRICES ARE EX. VAT. PLEASE ADD 15%

P.O. Bom 19    • Tat^oo. 01 flBO 48H9 24Mf An^ton*: ErtOi (032241 30830

Crith    T»M> 8813771 GECOMS-G |An*n»on OUARTSLABl'

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