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KF5JRV > TECH 09.02.17 14:22l 14 Lines 1585 Bytes #999 (0) @ WW
BID : 10128_KF5JRV
Read: GUEST
Subj: Xtal Radio
Path: IW8PGT<IR2UBX<DB0RES<DB0EEO<DB0GOS<ON0AR<VE2PKT<N9PMO<NS2B<KF5JRV
Sent: 170209/1215Z 10128@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
There was an enormous variety of crystals sets or cat's whisker radios that were manufactured for the domestic market in the 1920s once radio broadcasting had become established.many of these crystal sets were sold as complete radios, but there was also a booming market in kits and the components. Many people made their own radios at home.
Other sets were manufactured commercially, and the finish on these was often, but most certainly not always better. One popular approach to enclosing the crystal sets was to use a wooden box with a cover. This meant the crystal set / cat's whisker radio could be closed to prevent damage of any accidental change of the dials and settings. Other radios were left open, and showed some of the excellent components used. Other crystal sets had coils that were mounted above the panel.
End of the crystal radio
As the number of broadcast stations began to increase, so did the requirement for greater levels of performance. Both improved selectivity and sensitivity were required. As indirectly heated valves or vacuum tubes became available, this considerably reduced the running costs of these radios as large batteries were no longer required - they could be run from mains electricity.
Also the superheterodyne radio started to become popular as it offered significantly better levels of selectivity and sensitivity. As a result, the crystal set or cat's whisker radio started to decline in use from the middle of the 1920s and early 1930s. By the end of the 1930s few crystal sets were in use.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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