Saturday, March 31, 2018

Daytime band scan on Medium Wave using basic domestic radios...March 2018

After a recent chat with Willie EI7CGB about Medium Wave reception, I did a daytime band scan to see what could be heard on the band using just basic domestic radios. I used two radios....

Silvercrest KH2030...The first one is a Silvercrest radio which I picked up in Lidl a good few years back. I think at the time, it was only about €18 and it's performance can be at best be described as mediocre. It's fine for listening to local stations on FM but on AM, the sensitivity is poor. At night, it can pull in the strong European signals but it's not very good for weak signals. It does however have a digital readout to show what frequency it is on.


Sony CFS-W360L... The larger radio is an old model which covers FM, Medium Wave and Long Wave. Considering its size, it probably has a bigger internal ferrite rod aerial for Medium Wave than the Silvercrest and as a result is better at hearing weak signals. The tuning dial however is analogue but that wasn't too much of a problem when there are only a small number of signals to hear during the daylight hours.




The tests were done in the middle of the day when only ground wave signals would be heard. This is what was heard.




Freq KHz Station Distance (kms) Pwr (KW) Location Notes
549 Spirit Radio 280 25 Carrickroe, Monaghan Nothing on Silvercrest. Very noisy on Sony. Positive ID due to local signal on VHF.
630 BBC Radio Cornwall 280 2 Lanner, Redruth, Cornwall Noisy on the Silvercrest. OK to ID. A good bit better on the Sony. Noisy signal.
657 BBC Radio Cornwall 300 0.5 Bodmin, Cornwall Very weak on Silvercrest. Strong enough to ID on Sony but difficult to make out what is being said. Very noisy on Sony.
693 BBC Radio 5 Live 370 50 Start Point, Plymouth, Dorset Assume it's Start Point S coast of Devon. Noisy on Silvercrest. Reasonable but noisy on Sony.
756 BBC Radio 4 R3-4 2 Lanner, Redruth, Cornwall Noisy on Silvercrest. Reasonable but noisy on Sony.
801 BBC Radio Devon 300 2 Barnstable, Devon Noisy on Silvercrest. Reasonable but noisy on Sony.
882 BBC Radio Wales 470 100 Washford, Somerset, England Noisy on Silvercrest. Reasonable on Sony. Seems to be one of the strongest signals.
909 BBC Radio 5 Live 380 50 Clevedon, Somerset Noisy on Silvercrest. Reasonable but noisy on Sony.
990 BBC Radio 5 Live 300 1 Tywyn, near Aberstwyth, W Wales Hardly anything on Silvercrest. A very noisy and weak signal on the Sony.
1089 Talk Sport R2-3 2 Washford or Redruth??? Noisy on the Silvercrest. OK to ID. A good bit better on the Sony. Noisy signal.
1215 Absolute Radio 470 100 Washford, Somerset, England Noisy on Silvercrest. Reasonable but noisy on Sony.

Notes...
1) A total of 11 signals were heard. Roughly 7 of them were strong enough to listen to but with a good bit of noise. The other 4 were weak.

2) The 657 KHz signal from the 0.5kw BBC Radio Cornwall transmitter at Bodmin was about the same level as the 25kw Spirit Radio transmitter up in Co.Monaghan on 549KHz. Considering that both are roughly the same distance from here, it just goes to show the difference a sea path makes even though I am still about 20kms inland.

3) I repeated the test on several days at about the same time, the results were the same. These are the basic 11 signals that I can hear from my house.

The equipment used was very basic and would be pretty typical of what most people would have. It does however set a useful base line on which to judge future tests and improvements.

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