HIKERS
ONE CONSTRUCTION PROJECT COMPETION for AGM 2006
The NZVRS would like to hold a construction project competition for the best
"Improved Hikers One" radio built by members, to be judged at the 2006
AGM. The Hiker set designs have been published and discussed in several
publications including past bulletins. The Lamphouse version attached, is one
suggested design.
Construction:
Members may use any construction methods - however judging points will be
awarded for the following:
Design – 30% includes;
- Respect of the
original circuit design and construction techniques of the era
- General look and eye
appeal - including the components and materials used
- Authenticity
Execution - 30% includes;
- Construction
techniques employed
- Execution skills
- Innovation in
reproduction of the original design
Performance – 30% includes;
- Set performance
- Ease of operation
Judges’ discretion – 10%
Performance will be measured by:
- A standard signal source (low
impedance source coupled by 2,000 ohms in series with 10 pF to mildly
limit Q loading) with preceding attenuator, connected to the aerial input
terminal of the set under test. Common or designated aerial earth terminal
return. The test frequency will be about 1 MHz (1000 kHz) audio modulated
at about 800 Hz,
- A "standard" set of
headphones (approximately 2,000 ohm impedance) termination,
- A level measuring set in high
impedance mode (coupled by 0.1 uF in series with 10,000 ohms) across the
phones, set to audio weighted mode (ie audio filtered, rf decoupled) to
measure the 800 Hz demodulated audio signal. The headphones will be used
to check the audio "quality" ie distortion, extraneous noises
etc.
- Set (regulated) voltages of +
9 volts high tension, + 1.5 volts B bias and 1.5 volt filament will be
provided. No alternative supplies are permitted for the performance test.
- The set should be capable of
receiving signals from 550 to 1500 kHz.
Design:
The Improved Hikers One design, as attached, is the suggested design with valves
such as 49, 1Q5, etc. While circuit various are possible more points will be
allocated to the recommended design, notwithstanding that other designs may
provide better overall performance –see allocation of judging points above.
The set was usually constructed on a wooden base board of approximately
6" x 6" (or 5.5" x 7") ie inches with a plywood front.
General:
- The entries shall be
completed before, delivered to and on display at the 2006 AGM. Absentee
constructors are welcome to enter and reasonable care will be taken of
submitted items, however nomination of a proxy caretaker is suggested to
look after your exhibit (eg to ensure it’s correctly assembled before
being submitted) and to ensure its safe return.
- There shall be no makers
identification marks on the sets other than a code number to be allocated
by the secretary or their agent. This code shall be attached by a secure
tie to a front or rear terminal (such as an earth terminal or similar).
These codes shall be allocated and attached in a confidential manner so
the judges have no indication of the makers.
- The entries will be judged by
committee appointed judge(s) whose decision shall be final. The judges
will strive to announced the results (of up to three placings - as the
judge(s) may decide) by the end of the AGM and these will be published in
the next Bulletin.
- The prize(s) include a
certificate for placement and the overall winner gets a free NZVRS
subscription for the following year.
- See our website www.nzvrs.pl.net/hikers for background material.
- o -
Additional notes and information:
See attached (1.5 Meg files) of the Bulletin Construction Details – Side A & Side B
See Greg Cooney’s Old Radio site with Hikers additional info at: http://www.oldradios.co.nz/hikers/index.htm