tips for constructing a shortwave radio part 2
The importance of a good quality tuning capacitor for the antenna coil. For VFO and antenna coil an air type tuning capacitor made from aluminium-like or brass-like metal works well. The shaft/knob of the tuning capacitor must be on ground to prevent hand effect when tuning, the turn should be sufficient (360 degrees). Note that less capacitance should occur when you turn the knob to the right, if not the frequency scale will be reversed. Normally the higher frequency is on the right side …
September 28th, 2008 at 2:06 pm
Good to know about difference between air variable capacitors and solid dielectric variable caps, when building SW radios.
November 8th, 2008 at 3:01 pm
OK thank you, they really differ.
December 23rd, 2008 at 11:26 pm
Again please publish the full schcimatics radioam232. Some want to know..
Stuart
December 27th, 2008 at 7:32 pm
ik zie dat je net zo verzamelaar als mij bent ;P
December 28th, 2008 at 3:19 pm
and a parts list. ; )
May 29th, 2009 at 4:26 am
Zeker weten. Sorry voor de late reactie. je vraag over het zelfbouw MF filter (geheel andere video overigens) zag ik ook erg laat, op een of andere manier krijg ik reacties (te) laat via YT. je vraag was of de afstand van de spoeltjes veel uitmaakt. Antwoord: ja dat maakt veel uit het is erg kritisch en moet met de scoop en een generator op 455 KHz worden afgeregeld.
May 29th, 2009 at 4:28 am
Sorry for the late reaction. All my radio schematics on You Tube are published in my book “Retro Radio”, publisher Elektor in the Netherlands. You can Google it. Book is in the Dutch language, but the schematics are in normal international electronic symbols.
May 29th, 2009 at 4:30 am
Sorry for the very late reaction, please see my reaction to stuartthegrant about your question concerning the schematic of the SW radio.
May 29th, 2009 at 2:21 pm
dank u