Radio W.I.A. still flourishing in Tassie Annual meeting
Recognised text
Text below was produced by optical character recognition and may contain errors. Check it against the original.
P.ge 62 Bam Rotes RADIO, August 15, 1928.
WIA Still Flourishing in Tassie
Seventh District at once handed a hack saw (the blade of which To *““can the cackle” and get down to business,
Crosby said was at least twelve months old and it might be said that the Club is very grateful to
W.L.A. ANNUAL MEETING as blunt as old Harry), and told to cuf some the P.M.G. Department for the assistance they gave
narrow strips of ebonite to hold the coils in in granting a permit to one of our members, Mr.
HE Annual Dinner and Meeting of the J. Ferry, enabling him to build and test the trans-
Wireless Institute of Australia (Tasmania place. Lon did a lot of grunting, and after
mitter at his own home, thus saving much time
. * -Division) was held at Launceston on the 28th about an hour had managed to cut three strips
in perfecting the “perk.” Of course, various types
July last, the following members being present:— of 1 inch by 6 inches out of a panel about of outfits were considered, and the first endeavour
Messrs. T. K. Jebb (in chair), L. J. Crooks 2 feet square. Later on 7AH arrived on the was a Split Series-fed Hartley with Telefunken
(7BQ), M. Graver, R. S. Hope (7RS), L. R. scene with 7BQ, and both did a lot of super- Modulation. Although fairly successful, this sys-
Jensen (7LJ), J. C. Newton, C. Scott (7CS), intending and giving a lot of cheek to the tem called for a perfectly steady power supply,
E. C. Sheldrick (7BT), A. C. Smith (?AB), hard workers. Of course, CS was the overseer which, owing to line fluctuations, was not avail-
}_\Y. T. Watkins (7DX), C. A. Walch (7CW), and did not have to do anything. At 1 o’clock able, thus necessitating continual adjustments.
J:‘ C. Kitto, T. W. Boyce, P. O. Fysh (7PF), the complete transmitter was finished, but as Well, eventually a system was evolved, and has
D. M. Richardson, J. V. Sheldrick, J. Spillane, subsequently proved satisfactory. It is simply a
the dinner bell had gone all hands had to QRT
G. S. Geard, F W. Medhurst (7AH), G. C. Master Oscillator with the oscillator modulated.
- until this, was over. Back to the shack again
McKinlay, and J. Flounders, also Mr. Sid Laws, By this means it is possible to modulate the entire
late Manager of 7ZL, Hobart. about half past one and hooked up the trans-
mitter with one “B” eliminator for both crystal radiated output with a single Philips A630.
The minutes of the previous annual meeting oscillator and amplifier valves. By the way, The oscillator is an ordinary UX-201A, fed,
were read and confirmed The balance-sheet two 201A valves were used, and these perked as are both the speech amplifier and modulator,
showed that the Institute funds were in a very O.K. first go, although nbdt a sign of any juice with 6-V. D.C. on the filament. The plate supply
sound condition. There being ten nominations whatever in :the aerial circuit. Watty took hold for the oscillator and modulator is approximately
for the positions of members of Executive Coun- of the key and ‘called CQ, and was at once 150-200-V. R.A.C., Raytheon rectifiers being util-
cil, of which only seven are required, a ballot
answered by 7HL, of Hobart, who gave a report ised throughout.
had to be taken. C. A. Walch and L. R.
of R9 pure DC. Not too bad at all for a It will be seen that modulating the oscillator
-Jensen were appointed scrutineers, and carried
out the business as if they had been at it all ficse adjustment. This station was worked right and feeding the modulated RF to the power
\ their lives. up till 2.30 p.m. in the afternoon, when all amplifier will give a uniform depth at any given
the “workmen” had to run for their lives to input (within reason), thereforé power fluctuations
The vote resulted in the following officers being
catch the motor to return to Hobart. On the have no noticeable effect upon the resultant qual-
elected for the ensuing year:—Mr, P. O. Fysh,
Chairman; C. Scott, Hon. Secretary; Messrs. W. Sunday night old Cork Esses had a go and ity of the modulation, nor upon the percentage,
T. Watkins, F. W. Medhurst, E. C. Sheldrick, worked 6SA, who gave him R4 to 6. Since as this is governed by the oscillated modulation
and T. K. Jebb being elected as members of the then all States have been worked, reports being portion alone. Assuming that the oscillator is
Executive Council, in addition to the Chairman Ré to 8 with an input of about 6 watts. Since modulated 80 per cent. (an easy matter consider-
and Secretary. DX wen: back to Hobart he has been QSO ing the low power involved in that section), the
CS every day at 1.30 p.m. for half an hour. outgoing “juice” will be modulated to that extent.
By the time these notes have reached the
By the time these notes appear in print 7CS
various States the Annual Convention will be The big advantage of this system lies in the
going full steam ahead at Hobart. Launceston is will be on much higher power and will welcome fact that the cost of a UX-210, speech chokes
o
the headquarters of the Tasmanian Division, but reports. Old 7BQ will not be long now before capable of carrying two UX-210’s together with
on account of more hams being in the southern he is on crystal control, and it is the hope of the. upkeep of same, is saved. Only one stage of
end, «nd the northern members seeing a good all that within the next couple of months every speech amplification is needed, and even then only
chanze to get away from their home town for transmitter in Tasmania will be crystal con- 45-60-V. D.C. is applied to the plate through
a few days, it was decided to hold the Conven- trolled. Watty has suggested a heading for our a 3%-1 interstage transformer (Thordarson); none
tion in Hobart. There should be a great gather- QSL cards, viz., “THE LAND OF A B C"— of the customary two or three stages of resistance
ing ot hams there. I understand there are Apples, Beer and Crystals. Owing to the owner or double impedance coupled amplifiers are re- ,
three coming from Victoria and SBY from South of a crystal set in Launceston complaining that
Australia. The hams from Launceston who will quired. This alone saves a considerable amounc of
7CS spoilt her reception of 3LO and 3AR on initial cost, upkeep and worry.
be present, are 7AB, 7CS, 7BQ, 7BF. Several
her crystal set when he was transmitting on
important items are set down for discussion, and Other features are high radiation for a given
226 metres, he has been notified that trans-
most likely will take the most part of a week. input (the input, by the way, is measured in the
missions during broadcasting hours must cease.
Our dear old father of Radio in Tasmania, 7AH, circuit of the P.A., and can be reduced by grid
F. W. Hedhurst, has the entertainment arrange- The undoubted word of one crystal set owner
bias), the necessity for only a small speech choke
ments well in hand, and “Pop” knows how to 200 miles away from a broadcast station, no in-
(in our case a re-wound audio transformer. coil
look after visitors. By the way, “Pop” ‘has a quiry whatever havin- been made, has robbed
with 4,500 turns of No. 36 enamelled wire), and,
room full of real wireless junk at his home, so dozens of other crystal set owners in the town
finally, absolute steadiness of wave. So steady is
I think AH had berter keep that room locked who cannot get 3LO from hearing anything at
our radiated wave that many reports of C.C. are
during the convention. all now, except when 7BQ or 7RS starts up.
received by the Hon. Secretary, Mr. O. K. Grif-
The life of a ham is hard. Nuf sed; more next fiths, of Waite Street, Blackwood, and unless the
The Launceston hams had a very busy time
on the 28th and 29th of July last, the occasion month. oscillator condenser is moved no adjustment can
being the visit of Warty, Crosby, Lon and Pop’s alter the QRH. RF chokes in both plus and
visit to Launceston to attend the annual meet- minus leads prove extremely advantageous in en-
ing of the W.LA. Crosby brought with him
a very nice crystal to install at 7CS.
«Blackwood Calling” abling us to eliminate most of the hum. They
consist of about 350 turns of No. 34 D.S.C.
On the afternoon they arrived CW and CS DETAILS OF THE TRANSMITTER wire wound on 2in. diameter cardboard tubes.
rigged up the crystal oscillator with “B” AT OA-5BR The P.A. inductances are space wound with a
N eliminator for H.T. supply, and she worked heavy gauge copper wire, while the oscillating coils
OSSIBLY some of the greatest changes ever
O.K. right from the start, but on the Sunday consist of No. 18 D.C.C. wound on a 3in. diameter
\
morning, when 7DX had had his breakfast at made at the headquarters of the Blackwood
O\ bakelite tube.
3
7 cork esses, DX said: “I think we will build Radio Club were recently effected. A strenu-
4 a complete transmitter and see how she perks.” ous effort was put forth to place the Club’s trans- A magnetic pick-up and an electromagnetic
mitter once again in the land of the living, and, “mic” complete the outfit, which is now probably
CS dug up an old transmitter frame and found
some spare pieces of ebonite for panel; then after months of tireless testing, never ceasing ex- one of the best modulated of the OA-§’s.
CW arrived, and he :tarted into the building perimental work and many, many headaches, the Anyone hearing our tests PLEASE QSL to the
operations with a will; then 7LJ arrived on Club now possesses the best transmitter that ever Secretary of the Blackwood Radio Club, Box 24,
the scene and asked if he could help. He was graced its rather cold shack. ° Blackwood.
. et e