[IRCA] 760 XEABC
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IRCA] 760 XEABC

XEABC Mex City is one of 2 Spanish language stations in, //web with talk...
http://www.abcradio.com.mx


Saul Chernos
Burnt River ON


 		 	   		  
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx
kokeilla eikä vain uskoa olevan hyvä koska tuossakin Maunon lainaamassa jutussa kuitenkin vain puhutaan toimivuudesta amatöörialueilla ei keskiaalloilla. Amatöörit harvemmin kokeilevat MW:llä lukuunottamatta meikäläisen kaltaisia jota amatööriliikennöinti ei kiinnosta lainkaan..... Suuri osa hakkurien tuottamista häiriöistä on sijoittunut kokeiluissani alle 1 MHz taajuuksille joten vaimennus siellä on erityisen tarpeellista. 73,s IJL >Joko kokeilitte sitä Fair-Rite 31-tyyppiä, jota täällä kehutaan: ><http://www.audiosystemsgroup.com/RFI-Ham.pdf>http://www.audiosystemsgr oup.com/RFI-Ham.pdf > >>New #31 Material is a Problem Solver The relatively new #31 material made >>by Fair-Rite Products >>is extremely useful, especially if some component of your problem is >>below 5 MHz. Measured >>data for the new material is displayed in Figs 18a and 18b. Compare it >>with Figs 19a and 19b, >>which are corresponding plots for the older #43 material. By comparison, >>#31 provides nearly 7 >>dB greater choking impedance at 2 MHz, and at least 3 dB more on 80 >>meters. At 10 MHz and >>above, the two materials are nearly equivalent, with #43 being about 1 dB >>better. If your goal is >>suppression or a feedline choke (a so-called current balun), the #31 >>material is the best all round >>performer to cover all HF bands, and is clearly the weapon of choice at 5 >>MHz and below. Between >>5 MHz and 20 MHz, #43 has a slight edge (about 1 dB), and above 20 MHz >>they're equivalent. >>We'll discuss baluns in detail in Chapter 6. >>The new #31 material is useful because it exhibits both of the resonances >>in our equivalent circuit >>? that is, the dimensional resonance of the core, and the resonance of >>the choke with the lossy >>permeability of the core material. Below 10 MHz, these two resonances >>combine (in much the >>manner of a stagger-tuned IF) to provide significantly greater >>suppression bandwidth (roughly one >>octave, or one additional harmonically related ham band). The result is >>that a single choke on #31 >>can be made to provide very good suppression over about 8:1 frequency >>span, as compared to 4:1 >>for #43. As we will learn later, #31 also has somewhat better temperature >>characteristics at HF. > > >12.12.2011 13:53, Roland Sandberg kirjoitti: >>Tämmöinen palaute tuli TJ:ltä Ruotsissa- tosi aktiivinen kuuntelija ja >>ferriittitestaaja ( mutta kaveri on totta kai Pietarsaaresta kotoisin) >>joka taas todistaa että 3H2 on tosi hyvä ferriitti.. >>"Stort tack för 3H2 ferriterna. Har gjort några korta tester med Perseus >>S-meter. It´s a keeper! Jag jämförde med en stackad BN-73 och kunde >>genast notera en något höjd signalstyrka, mest märkbar på det lägre mw-bandet". >>73' >>RS >> ________________________________________________________________________ ___________ Tilaa WRTH 2011 nyt: http://www.hard-core-dx.com/redirect2.php?id=wrth2011 ----------------------------------------------------------------- DX mailing list DX@xxxxxxxxxxxxxxxx http://montreal.kotalampi.com/mailman/listinfo/dx _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://www.gnu.org/licenses/dsl.html ___________________________________________________________________________________ Tilaa WRTH 2011 nyt: http://www.hard-core-dx.com/redirect2.php?id=wrth2011 ----------------------------------------------------------------- DX mailing list DX@xxxxxxxxxxxxxxxx http://montreal.kotalampi.com/mailman/listinfo/dx _______________________________________________ THE INFORMATION IN THIS ARTICLE IS FREE. It may be copied, distributed and/or modified under the conditions set down in the Design Science License published by Michael Stutz at http://www.gnu.org/licenses/dsl.html