Dave--If you are interested in receiving WWV, it's possible using a stock R-4B. Check out this link _http://www.dproducts.be/drake_museum/03_1971_pdf.htm_ (http://www.dproducts.be/drake_museum/03_1971_pdf.htm) from The Drake Virtual Museum website. It states: "It is possible to receive the 5-MHZ transmission from WWV on a Drake R-4A by setting the band switch to 3.5 MHz, the tuning dial to 3.6325 MHz, a n d t h e p r e s e l e c t o r t o 4 0 m e t e r s . The s e c o n d harmonic of the VFO beats with the 5-MHZ WWV signal to produce a signal at the first i-f. ~ Donald R. Stickle, K2OXP" This technique works fine on my B line. Of course, the 41 meter SW broadcasting band is "free." 73, Tony N3WAK In a message dated 12/3/2010 12:01:08 P.M. Eastern Standard Time, drakelist-requ...@zerobeat.net writes:
Send Drakelist mailing list submissions to drakelist@zerobeat.net To subscribe or unsubscribe via the World Wide Web, visit http://mailman.zerobeat.net/mailman/listinfo/drakelist or, via email, send a message with subject or body 'help' to drakelist-requ...@zerobeat.net You can reach the person managing the list at drakelist-ow...@zerobeat.net When replying, please edit your Subject line so it is more specific than "Re: Contents of Drakelist digest..." Today's Topics: 1. Improving Drake R-4B (Dave) 2. Re: Improving Drake R-4B (Garey Barrell) 3. Re: Improving Drake R-4B (Richard Knoppow) ---------------------------------------------------------------------- Message: 1 Date: Thu, 2 Dec 2010 14:32:46 -0800 (PST) From: Dave <kaise...@yahoo.com> To: drakelist@zerobeat.net Subject: [Drakelist] Improving Drake R-4B Message-ID: <241214.81078...@web113908.mail.gq1.yahoo.com> Content-Type: text/plain; charset="us-ascii" I just bought a stock Drake R-4B. Suggestions on how I should upgrade/improve this rig and how to determine what crystals and filters I need for AM reception would be appreciated. In the 1970s I had a Drake C-line station and a chart that told me what crystals I needed to install to hear WWV and foreign broadcasts. Dave Kaiser, AL7HG Crystal River, FL 34428 www.FloridaPublishing.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.zerobeat.net/pipermail/drakelist/attachments/20101202/836866bf/attachment-0001.html> ------------------------------ Message: 2 Date: Thu, 02 Dec 2010 17:54:58 -0500 From: Garey Barrell <k4...@mindspring.com> To: Dave <kaise...@yahoo.com> Cc: drakelist@zerobeat.net Subject: Re: [Drakelist] Improving Drake R-4B Message-ID: <4cf823c2.6060...@mindspring.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Dave - Not much needed. The AM filter is a bit of a problem, as the 'B' has no optional filter capability. It 'MIGHT' be possible to bypass the Passband Tuner and rely on the 'roofing' filter in the 1st IF which is a 6 kHz wide half-lattice filter. The widest b/w for the Passband Tuner is 4.8 kHz which is fine for picking off ONE sideband of an AM signal. There is a crystal chart in the manual, but all you need to do is add 11.1 MHz to the frequency you want at the bottom of a band. WWV and 30M would be 10.0 MHz plus 11.1 equals a 21.1 MHz crystal. International Crystal Mfg has all the info, just tell them what frequency you want to listen to. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-B, C-Line& TR-4/C Service Supplement CDs <www.k4oah.com> Dave wrote: > I just bought a stock Drake R-4B. > > Suggestions on how I should upgrade/improve this rig and how to > determine what crystals and filters I need for AM reception would be > appreciated. In the 1970s I had a Drake C-line station and a chart > that told me what crystals I needed to install to hear WWV and foreign > broadcasts. > Dave Kaiser, AL7HG > Crystal River, FL 34428 > www.FloridaPublishing.com <http://www.FloridaPublishing.com> > ------------------------------ Message: 3 Date: Thu, 2 Dec 2010 18:12:59 -0800 From: "Richard Knoppow" <1oldle...@ix.netcom.com> To: <k4...@mindspring.com>, "Dave" <kaise...@yahoo.com> Cc: drakelist@zerobeat.net Subject: Re: [Drakelist] Improving Drake R-4B Message-ID: <fb1602f1069d43078c013442d97d9...@valued20606295> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response ----- Original Message ----- From: "Garey Barrell" <k4...@mindspring.com> To: "Dave" <kaise...@yahoo.com> Cc: <drakelist@zerobeat.net> Sent: Thursday, December 02, 2010 2:54 PM Subject: Re: [Drakelist] Improving Drake R-4B > Dave - > > Not much needed. The AM filter is a bit of a problem, as > the 'B' has no optional filter capability. It 'MIGHT' be > possible to bypass the Passband Tuner and rely on the > 'roofing' filter in the 1st IF which is a 6 kHz wide > half-lattice filter. The widest b/w for the Passband > Tuner is 4.8 kHz which is fine for picking off ONE > sideband of an AM signal. > > There is a crystal chart in the manual, but all you need > to do is add 11.1 MHz to the frequency you want at the > bottom of a band. WWV and 30M would be 10.0 MHz plus 11.1 > equals a 21.1 MHz crystal. International Crystal Mfg has > all the info, just tell them what frequency you want to > listen to. > > 73, Garey - K4OAH > Glen Allen, VA > My R4-B sounds OK on the short wave stations it will hear (plenty on 40 meters). Because of the noise level on most HF stations really wide bandwidth is not very practical. There are a few very strong ones but mostly not. BTW, its often possible to improve reception of stations with severe selective fading by receiving it as an SSB signal using the tunable IF to get rid of the original carrier. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ------------------------------ _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist End of Drakelist Digest, Vol 30, Issue 4 ****************************************
_______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
