7HRlog
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Extracts from 7HR/7WI log Richard Rogers VK7RO 2002/2006 The Hobart Radio Research Club was formed when the Tasmanian WIA headquarters moved to Launceston in 1925. Their club station was 7HR. Here are some extracts from their log book with a few explanatory additions. 24/8/27 Elizabeth Street [first entry] RX 0 - V - 1 Inside antenna, no earth TX DE5 Hartley oscillator 2 x AR Ediswans as rectifiers 230V 38mA RAC [rectified AC? ie no filtering] 32 M [wavelength] Ant 96' long 40' high & counterpoise 31/8/27 "5BW is losing his usually good 'fist' as he has motor bike mania" 2/9/27 "...words were broken up owing to vibration of receiver coils - caused by the Tailor under the Club Rooms" 7LJ using 700V each side of centre tap and 26 jars [electrolytic rectifier?] 6/9/27 [worked] 7HL at Radio Exposition at Town Hall [no entries 29/9/27 until 21/6/28] 21/6/28 [ex 7DX re 7HR TX] "a long way from being correctly tuned as can hear closed circuit oscillator out of tune with antenna counterpoise circuit" 18/7/28 8.20pm [heard] slow morse from 7DX icw [interrupted continuous wave] 1/8/28 [from 2NS] 7HR has two distinct waves 20/8/28 [operators] OA-3KB and OA5BY [during WIA convention?] 8/1/29 change 7HR to 42M [new regs from 31/12/28] 5/1/29 [working] VKX7HR on SS Toorah 4/2/29 X-VK7HR installing portable crystal controlled transmitter on Toorah on air 84M [note the use of X... for portable work] 5/2/29 Regatta Day 9am On the air 84M . . . Cruising up and down River Derwent with Mr Sweeting of 7ZL at microphone describing racing, swimming and rowing events which was being received by 7ZLs short wave receiver in the city. 4/7/29 increased power slightly by short circuiting "ford" choke 26/7/29 7LJ ". . . good to hear the billy goat again hi R 8 - 9 note pretty fair RAC wid DC" [billy goat gruff? a comment on the transmitters poor note?] 2/8/29 VK7HR 3/8/29 VK7WI [The WIA headquarters had moved back to Hobart] 7/8/29 2000 VK7WI de VK5WI 1/11/29 New room 66 Liverpool St 20/11/29adjusting VK7WI crystal and tuning [new crystal controlled tx] 4/12/29 VK7WI de W6AM [first W QSO] 11/12/29Found slop jars dry and others low in electrolyte topped drys with small quantity of H2O 16/12/29TX rectifiers attended to 18/1/30 Put new juice in slops cleaned them up a little 9/3/30 slop jars cleaned and topped up 27/1/30 de VK3PR "I heard u qso XVK3BQ... [field day] 23/3/30 listened for XVK7WI Field Day 28/3/30 Mr Scrivner Chief P/O Tel Canberra called in to 7WI steady xtal with dc note 16/4/30 Xr out of action. No perk. VK7WM (later found wire off key hi wm) 25/5/30 CO seemed OK 17/6/30 slop jars overhauled 7DXs last record in log book [he died on 26/8/31] 21/6/30 put new soda in slops 9/9/30 VJMP on the job again [C Peddell an RAAF operator?] Built TPTG Osram DE5 input 30 mills 9 W ur RAC sigs 7HO [new broadcast station] harmonic blotting out lower band 10/9/30 lowered input 20 mills 300 V 6 watts 15/9/30 refilled & rejigged slop rectifier with power tranny Gosh 40 mills think 500V 27/7/31 checked wavelength 29/8/31 Put a hedgehog & a bank of capacitors in HT+ lead & thereby improved note [a hedgehog was a transformer used in telephone work] 5/10/31 de ZL3OS ...a bally ham came on... 8/12/31 Slow Morse transmission 17/1/32 RF choke open, wire corroded thru using acid flux for soldering [RAC oscillator TX 24/8/27 to 1/11/29 32M 8/1/29 42M (new regs 31/12/28) crystal controlled TX 1/11/29 to 9/9/30 RAC again from 9/9/30 7 entries about maintenance of electrolytic rectifiers!]