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July 6th 11, 01:58 AM
posted to rec.radio.shortwave
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Sangean ATS-909x question
On Jul 5, 5:47*pm, rkhalona wrote:
On Jul 5, 5:22*pm, RHF wrote: On Jul 5, 5:09*pm, Wimpie wrote: El 06-07-11 1:03, rkhalona escribió: On Jul 1, 8:33 pm, wrote: On Jul 1, 6:36 pm, *wrote: On Jul 1, 2:55 am, *wrote: On Jun 29, 11:12 am, *wrote: On Jun 26, 8:20 am, *wrote: On Jun 23, 10:31 am, *wrote: Any owners of this new radio here? I am wondering if you are hearing any (audible) difference when you switch between the wide and narrow bandwidth settings in AM mode. Thanks for your answers. Ramon Khalona "RK", Go Here for the Sangean Company webpage for the Sangean ATS-909XAM/FM/SW Receiverhttp://www.sangean.com/products/products_main.asp?pid=71&pan=9&um=3 -has-down-loads-for- * Manual PDF -note- Read Page 32 "Switch Setting" : AM Narrrow / Wide -says- The Filter Switch works NW in the AM Mode -and- Is Always Narrow in SSB Mode * Specification PDF * Flyer PDF Call/Contact Sangean USA and ask then the Question as to the Band-Widths of the AM Mode Wide and Narrow Filters in the Sangean ATS-909XAM/FM/SW Receiverhttp://www.sangean.com/contact_us/contact_us.asp?um=5 INFO : Phone + eMail + On-Line 'Web-Request' Form * . * . -alternative- Radio Labs Support may be able to answer the Question as to the Band-Widths of the AM Mode Wide and Narrow Filters in the Sangean ATS-909XAM/FM/SW Receiverhttp://www.radiolabs.com/support/ * . * . Thanks RHF. *I am looking for other users' experience. *My unit comes from Radio Labs, with the filter upgrade (their so-called, "Clearmod" modification). The difference when I switch from AM wide to narrow is almost always inaudible and, for all practical purposes, does not make any difference without detuning the radio in slow mode. *I wonder if owners of the stock radio experience the same. (The Radio Labs people think this is the way the radio is supposed to work, which I found puzzling and surprising) RK RK, If you have a Very W-I-D-E 'Wide' IF Filter +8 kHz and a not-so-wide 'Wide' IF Filter ~4 kHz you may NOT hear or detect too much difference between the two when it comes to AM-Mode Radio Reception. However, If you have a Standard 'Wide' IF Filter ~5 kHz and a Narrow IF Filter -3 kHz you may well Hear a/r Detect some real difference between the two when it comes to AM-Mode Radio Reception. What "kHz" and "Shape Factor" Rad-Labs 'claim' for their Wide and Narrow IF Filter in the Mod'ed Sangean ATS-909XRadio ? Sangean ATS909X- Modified for Clarityhttp://www.radiolabs.com/products/receivers/ats-909x-mod.php iwtk ~ RHF * . * .- Hide quoted text - - Show quoted text - Hi RHF, Radio Labs claims they have used 4.5 KHz for wide and 2 KHz for narrow. *As I said in my response to Dave, one should be able to hear the difference between these pretty easily (for reference, my Drake SW8 has 6, 4 and 2.4 KHz bandwidths, and one can hear the difference between all three pretty well, especially in going from the middle to the lowest bandwidth because the narrowest filter muffles the audio distinctly). * I just wanted to hear about other users' experience, wether they have the stock or modified radio. Thanks for your reply. RK- Hide quoted text - - Show quoted text - You can try this simple test I just thought of . * A) Tune to a loud,stable AM-modulated station . *B) Turn the SSB on . *C) Play with USB/LSB setting . D) Detune the received frequency slightly ( no more than 1-2 KHz) ,so you hear the beat sound increasing or decrease in the pitch . *E) Play with the wide/narrow setting . F) If the filters are really there- -the change must be very obvious .- Hide quoted text - - Show quoted text - Hi there again, The reason this test does not work with this radio is that in SSB mode, the radio is automatically set to the narrow bandwidth and the switch becomes inoperable, hence there is no difference. *However, when you tune to a strong station in AM mode on narrow and then detune by several KHz so that the station is inaudible and you switch to wide, the station is audible again. *This suggests the switch is working, but the bandwidths used are not that different to make for an audible difference. *Several users of the stock radio have reported similar behavior (i.e., not much difference between wide and narrow bandwidths). Thanks again for your suggestion. RK Hello Ramon, Really strange, as with the "old" 909, the difference is clearly noticable, even with the tone setting on news. They Sangean guys probalby did something weird, as normally you work on "wide" only in case of interference from an adjacent station or noise you switch to the narrow setting to get a readable signal, but with reduced audio quality. I checked it on several stations. Now (00:00h UTC), Radio Havana reaches Netherlands on an indoor antenna (6000 kHz). *Did you test it also on a weak (noisy) station? Maybe you can contact a radio amateur to do some measurements on the radio to find out what is the root cause for the behavior. With kind regards, Wim PA3DJSwww.tetech.nl Please remove abc first in case of PM ? Maybe that is part of the Problem; the "Tone" Switch on the Right Side of the Radio needs to be set a "Music"; for you to Hear an Audio 'difference' between the Wide and Narrow IF Filters !http://www.universal-radio.com/catal...le/2909rs.html That's not it. *I always keep the radio on the "music" tone setting, as this gives the best audio fidelity. RK Asked and Answered. |
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