Volume 15 No 6 Dec 1964.pdf - Lakes Gliding Club

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and No\IVa Fully Transistorised ~ Walkie-Talkie! the~@!!~V~D!~!:n Once again in ~ the tradition of the outstanding Cambridge and Vanguard Radiotelephones, Pye have produced the Bantam, a brilliant fully transistorised Walkie-Talkie. • Fully ".anala'orlnd T'...."'itt.r a"4 ftecll'iVlI'f • len, .nd.ranee with Recha'l1••bht Of Dry " .....,ies • et)'st.1 Filter ulectivity • fteliabilit, and .c~bilit)' of components • Very high perfoflll1ance Recei"., • Lightweight .. lb•• (1.12 kg.) • FreqU-ency Band 25·11. Mc's. • We.th~,pro.f • Approved by G.P.O. to Spec. WUCS. rEL: TE'IERSHAM 1/1/ PYE TELECOMMUNICATIONS LTD. CAMBRIDGE ENGLAND' Telex No. 81166
small enough to be installed inside the cockpit where the channel selection, onoff aDd volume control switches are accessible to the pilot. The set has a selfcontained 15V nickel-cadmium battery. This battery can be recharged overnight using a special constant current mains operated charger and gives about 8 hrs. operation, which is in general adequate. A hand unit serves as a combined loudspeakerI microphone and is fitted with a press-te-talk changeover switch. The receiver volume is varied in steps by a switch and an internal squelch is fitted to remove background noise in the absence of a signal. This circuit is switched out in the maximum volume position. The receiver sensitivity was measured to be aPPTo'ximately 3/,V for 10 db SIN ratio, but some difficulty was experienced in measuring the bandwidth of the set supplied, which did not appear to be properly adjusted. The set was fitted with a 25 kcs. filter which, even had it been working correctly, might be a trifle narrow, since not all the older glider radios are capable of maintaining their frequency within this margin. AJternatively a 50 kcs. filter is obtainable. The receiver spurious responses were found to be at least 50 db down. The transmitter power output was just over 150 mW and the modulation was very clear. No limiter is provided in the transmitter to prevent overmodulation of the signal, which could cause interference to other users of the VHF band. The transmitter stability and spurious radiation were within the G.P.O. specification for this type of equipment. Pye Bantam type HP1/AM/N This set is similar to the Ultra but is a little larger. Three alternative internal batteries can be fitted, seven U7 torch batteries, eight Ma110ry batteries, or a nickel~dmium accumulator. The set supplied was fitted with a battery holder for the U7 cells. These were found to be very satisfactory, and to have adequate capacity for one day's operation. To use inexpensive dry batteries and to change them each day is probably the cheapest, and most convenienr, arrangement for most users. The set has an internal loudspeaker, or thc microphone 449 "Telecomm" Glider Radio-telephones All fully transistorised and of British manufacture. AR.8. & G.P.O. approved. Low power model TRT/2 £150. High power model TRTJ2B £200. These instruments are not made down t9 11 price, tbe keynote of the design being the ultimate in performance and reliability. RADIO COMMUNICATIONS CO. 16 Abbey St., Crewkerne, Somt. Contractors to Air Ministry, War Office, G.P.O., I.T.A., C.E.G.8., U.K.A.E.A., etc., etc. can be used alternatively as an earphone. The receiver has a variable volume control and alsQ an adjustable squelch level. By careful setting of these two controls very weak signals can be received clearly, with no background hiss in the absence of a signal. The squelch control required some readjustment as freezing level was reached, or alternatively as the batteries reached the end of their life. The receiver sensitivity was such that less than I,..V was required to give a 10 db SIN ratio. The receiver bandwidth was 50 kcs. and all spurious responses were greater than 60 db down. The AGe was particularly efficient and the set did not overload or block on very strong signals. The transmitter power output was about 30D mW, and a modulation limiter is fitted. However. this was nOI set up as efflciendy as it might perhaps have been on the set supplied, as it limited the modulation to about 60%. When l:orrectly set up, a Iimiter e.nables very efficient modlllation to be obtained. Scme trouble was experienced initially
Page 1 and 2: SAILP A & G 101 G December 1964 - J
Page 3 and 4: SAILPLANE AND GLIDING OFFICIAL ORGA
Page 5 and 6: 1964 -1965 T. has been a staggering
Page 7 and 8: T Entries for World Championships H
Page 9 and 10: I The Arm-Chair Pilot 11. Portable
Page 11 and 12: TAIL WIND FIG.Z: MARKn PORTABLE POL
Page 13 and 14: TATE GALLEllY 1740 W THE KRONFELD E
Page 15 and 16: frustrating or even impossible, For
Page 17 and 18: Pilot A B C D E FG Table I Distance
Page 19 and 20: Memories of the Stone Age of Glidin
Page 21 and 22: The Shaw Slingsby Trust HERE is sad
Page 23 and 24: Monday, 6th July Task: a 212t-mile
Page 25 and 26: liE pulley launch is based' ,on the
Page 27 and 28: Our tow-car is a V-8 Fordomatic sal
Page 29: cable drop. The puIley is left unat
Page 33 and 34: with the transmitter, which necessi
Page 35 and 36: 1956. at about mid-day, a big heap
Page 37 and 38: Northamptonshire Northumbria Ouse P
Page 39: on a piece of paper and had dropped
Page 42 and 43: Camphill takes the Beer Tray by PET
Page 44 and 45: ·WRIGHT Ft.NE QUALITY BUILDINGS --
Page 46 and 47: CORRES·PON DENCE REVIVE THE WINCH!
Page 48 and 49: "We have been to two such weeks, bo
Page 50 and 51: It's almost like 80ating on air Tow
Page 52 and 53: Adv~r'ist!menu, with remittance. sh
Page 54 and 55: CLUB NEWS 'jb OUR Editor paid a mos
Page 56 and 57: the Kite 1 77 km. to Plymouth to co
Page 58 and 59: mers have now all gone home express
Page 60 and 61: the site, together with the prospec
Page 62 and 63: flies Graham Smith completed his ba
Page 64 and 65: Grunau 2B 01 the Cheviots Club flie
Page 66 and 67: Peter Coldney sends this photograpl
Page 68 and 69: distance Ic:gs on his last flight w
Page 70 and 71: CANADA UEBEC Soaring Club reports:
Page 72 and 73: HOLLAND A FTER our Nationals five p
Page 74 and 75: August 11th, frontal air mass Free
Page 76 and 77: ous cockpit make it as comfortablt:
Page 78 and 79: I Bristol Gliding Club NYMPSFlELD,
Page 80:
From the makers of Senior Service a
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Volume 15 No 6 Dec 1964.pdf - Lakes Gliding Club

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