Greg Pain Posted July 23, 2019 Posted July 23, 2019 I have a McLeod am wide band component radio, but have no info on it. It appears to be for use in Adelaide, South Australia, as it has local stations printed on its horizontal dial, up to about the mid 80's when many of the stations changed over to fm (and now dab+). Does anybody have any information on it? It still works, although its bandwidth is close to or more than 9khz, as nearby stations can be heard overlapping, unfortunately. Stations 'away' from nearby stations are remarkably clear, with treble response well above todays am transmissions. 1
theoldnic Posted August 1, 2019 Posted August 1, 2019 You may find a bit by the changes and history of the Australian Radio Frequency Spectrum Allocations. Take a look in the ACMA government site , it may be able to point you in the correct direction for it, seems to be 1600Khz to 600Khz as AM broadcast is however BUT search in reference to wide band transmitter allocations of the year/era.
surprisetech Posted August 2, 2019 Posted August 2, 2019 On 23/07/2019 at 11:47 PM, Greg Pain said: I have a McLeod am wide band component radio, but have no info on it. It appears to be for use in Adelaide, South Australia, as it has local stations printed on its horizontal dial, up to about the mid 80's when many of the stations changed over to fm (and now dab+). Does anybody have any information on it? It still works, although its bandwidth is close to or more than 9khz, as nearby stations can be heard overlapping, unfortunately. Stations 'away' from nearby stations are remarkably clear, with treble response well above todays am transmissions. Not familiar with that brand. Might be worth making an enquiry through your local HRSA group. https://hrsasa.asn.au/
MLXXX Posted August 2, 2019 Posted August 2, 2019 On 23/07/2019 at 11:47 PM, Greg Pain said: It still works, although its bandwidth is close to or more than 9khz, as nearby stations can be heard overlapping, unfortunately. Stations 'away' from nearby stations are remarkably clear, with treble response well above todays am transmissions. It may have been designed so long ago that it incorporates a 10kHz whistle filter. That was useful when Australian medium wave band AM stations were spaced 10kHz apart, rather than the current spacing of 9kHz (which took effect in November 1978). Yes the treble response would far exceed that of ordinary AM tuners incorporated into AVRs, or portable radios, or car radios. The downside is the much increased risk of picking up interference (especially at night) and signals from stations on adjacent frequencies. What I find a bit disappointing is the level of THD with AM radio reception, even when using a design focusing on audio quality, such as yours. The AM medium wave broadcasters in Australia are licensed to transmit audio at up to 9kHz and will do so, but many broadcasters will boost the mid-frequencies in order to achieve a punchy sound on non-wideband radios (which would represent over 99% of AM radios in current use in Australia).
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