Re: [Elecraft] IF OUT - Same as just sharing the antenna?
The K3's IF OUT bandwidth is limited only by the front-end RF filters so it covers an entire amateur band, plus. That is handy for a panadapter because it is always centered on the VFO A frequency. The IF center frequency is 8.215 MHz. Alan N1AL On 3/9/2024 11:04 PM, Fred Jensen wrote: It's around 8.15 MHz. It's ahead of the ADC and 15 kHz 2nd IF, the RF is over 200 kHz wide and is nominally there for connection to a P3. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County Ed Parish wrote on 3/9/2024 12:57 PM: IF means Intermediate Frequency. It is the result of mixing the RF with a local oscillator, LO. So, no, it isn't sharing an antenna. On Sat, Mar 9, 2024, 15:39 JHR wrote: Please help me understand how the IF OUT works on an Elecraft radio. Is it the same thing as sharing the antenna with a T/R switch, or does it tap the RF processing chain later down the line. Does the IF OUT merely share the antenna, or does it come later in the circuit - are there any practical reasons why one is better than the other? I presume the IF OUT is better, but wonder why. [It matters and will settle a bet who eats steak and who eats hot dog.] Thanks in advance K8JHR __ Elecraft mailing list Home:http://mailman.qth.net/mailman/listinfo/elecraft Help:http://mailman.qth.net/mmfaq.htm Post:mailto:Elecraft@mailman.qth.net This list hosted by:http://www.qsl.net Please help support this email list:http://www.qsl.net/donate.html Message delivered tok1ep.l...@gmail.com __ Elecraft mailing list Home:http://mailman.qth.net/mailman/listinfo/elecraft Help:http://mailman.qth.net/mmfaq.htm Post:mailto:Elecraft@mailman.qth.net This list hosted by:http://www.qsl.net Please help support this email list:http://www.qsl.net/donate.html Message delivered tok6dg...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Re: Elecraft Digest, Vol 23, Issue 26
Greetings all, We had an interesting time a few years ago in the UK when PLT (power line telecomms) was a new threat. We built a mains supply to spec complete with street lighting standards and then tested various power line transmission proposals for radiation. Needless to say it radiated, even when the light standards were disconnected. The test results were all very well but it was all summed up quite nicely when, still without the light standards, the amateurs in the technical group held 57 (if not 59) QSOs with most of continental europe on QPR rigs. The cable isnt underground in the rf sense, its just in a different dielectric medium and -2ft AGL. Regards Alan G0HIQ --- [EMAIL PROTECTED] wrote: ...Doesn't that give the lie to our historical claims that you can put the usual utility lines underground but not radio antennas? I guess that with enough power one can put any antenna underground (GWEN) or even underwater (SUBCOMM) but let's not give my wife any more ammunition!! Has anyone here tried it? -- 73 de K2ASP - Phil Kane ___ Yahoo! Photos NEW, now offering a quality print service from just 8p a photo http://uk.photos.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: Elecraft Digest, Vol 22, Issue 2 Message 3 TVI
Hi David, My suggestion is a coaxial trap or possibly a series LC to deck (use a trimmer C). The insertion loss will be minimal. A single trap had little effect on the feed Z as shown on my Tx but ideally a second one about lambda/4 at 145MHz further down the feeder will offset the effect at 145. I'll be interested to see how it works on the harmonic. Regards 73 Alan G0HIQ > Message: 3 > Date: Wed, 1 Feb 2006 12:07:19 + > From: David Pratt <[EMAIL PROTECTED]> > I am having a problem with 5th harmonic radiation from my > XV144 transverter. I have found that I am causing TVI to > the UK analogue Channel 51 (711.25MHz) and digital Channel > 52 (719.25MHz). Other TV channels are free from interference. > 73 de David G4DMP ___ Yahoo! Photos NEW, now offering a quality print service from just 8p a photo http://uk.photos.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] No Code UK view
Hi all, The UK amateurs voted by a reasonable but no a large majority to drop the code post WRC03. The issue for the administration (then the Radiocommunications Agency - RA) was a defensible licensing need. Historically CW was the only common mode between amateurs and the other users with whom they shared many bands. Consequently a valid case could be made to need a code test. Now all the other (professional) users have dropped the code so there is no licensing need. The RA would not have won a challenge to demonstrate why a license to operate on HF required code ability. The other examinable features of the licence examinations can be justified. I cannot speak for how the FCC will regard the matter or for US jurisprudence, but if they make a rule for which they cannot provide a justifiable need, then I assume they are liable to legal challenge. Ergo, you have to provide them with a need to retain code testing that they can stand up and say whilst keeping a straight face. Regards Alan G0HIQ ___ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: Elecraft Digest, Vol 16, Issue 21
Hi all, Ken aa7jc said "I have not done much testing yet since I don't have anything that draws that much current." I have a couple of drums of mains cable known in the UK as 2.5 T&E, the 2 conductors are 2.5 mm sq and earth is about 1.5. The inner end is available so I soldered the two main conductors together. UK rating is about 22A depending on how its installed, rather less rolled on a drum! Connect the two 'free' ends to 'short' the PSU. You are only looking for 1/2 1/3 1/4 ohm depending on current; it works very well for plenty long enough for stiffness tests, unroll for a soak test or it probably wont unroll ever again ! Regards 73 Alan G0HIQ ___ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] magnetic fields and phase noise
Hi All, Reading the magnetic field and phase noise saga makes me think of earth loops. If moving to another power socket- as in moving to another room cures it. How about using mains isolation transformers so only connection K2-linear really is the coaxial feeder. Or battery power K2. Just a thought. Alan (actually G0HIQ but my e-mail provider wont let me have it!) = = = = = = = = = = = = = = = = Subject: [Elecraft] magnetic fields and phase noise? To: [EMAIL PROTECTED], [EMAIL PROTECTED], elecraft@mailman.qth.net Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; format=flowed Interesting Earl, the non exhaustive tests I've done indicate that it is not due to magnetic fields. But if indeed that is the case, there must be a relatively easy, if perhaps not elegant, way of significantly improving this. Send instant messages to your online friends http://uk.messenger.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
