7HRrigs
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Extracts from 7HR log about the equipment used Richard Rogers December 2004 24/8/27 Elizabeth Street RX 0 - V - 1 Inside antenna, no earth TX DE5 Hartley oscillator 2 x AR Ediswans as rectifiers 230V 38mA RAC [rectified AC - meaning that the transmitter supply voltage was unfiltered] 32 M Ant 96' long 40' high 31/8/27 "5BW is losing his usually good 'fist' as he has motor bike mania" 2/9/27 7HR oa 2SS . . . (His phone was loud - clear and steady but words were broken up owing to Vibration of Receiver Coils - caused by the Tailor under the Club Room - this is first contact between 7HR and N.S.Wales) Went to answer 5WP and found that one of the "AR" Rectifier tubes had expired [later] put two 201A tubes in for Rectifiers 7HR oa 7CW . . . note is 1/2 wave not exactly rough but very ripply (cause of 1/2 wave rectification. One 201A had poor contact and only one tube was functioning) [later] 7LJ using qro(r7) 700V each side of centre tap - 26 jars qrp(r4) 20 watts 201A 45 milliamperes [sounds as if Lon, 7LJ was using an electrolytic rectifier] 3/9/27 Note:- Very Windy in Hobart 5/9/27 Found antenna twisted round cpse [counterpoise] hi? 6/9/27 [wkd] 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 1/8/28 [from 2NS] 7HR has two distinct waves 20/8/28 [ops] OA - 3KB and OA5BY [during WIA convention?] 8/1/29 change 7HR to 42M 5/1/29 [wkg] VKX7HR on SS Toorah [testing] 4/2/29 X-VK7HR installing portable crystal controlled transmitter on Toorah on air 84M 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?] 2/8/29 VK7HR 3/8/29 VK7WI[?] 7/8/29 2000 VK7WI de VK5WI 2015 CQ de VK7HR 1/11/29 New room 66 Liverpool St 20/11/29adjusting VK7WI crystal and tuning 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] Built TPTG Osram DE5 input 30 mills 9 W ur RAC sigs 7HO 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 5/10/31 de ZL3OS ...a bally ham came on... 8/12/31 Slow Morse transmission 16/12/31heard 7KV[?] 7/1/32 7KV testing 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 (possibly built by 7DX & returned to him when he was no longer able to attend clubroom?) RAC again from 9/9/30 7 entries about rectifiers!]