RF Quiet my digital recorder
I am using an Olympus digital audio recorder for logging LEO passes, because I can directly transfer a .wma to my PC from it (versus the tape recorder I used in the 90's).
I am using an extension clip-on mic. I am finding that it generates a lot of RF crud on 435, enough to swamp the RX if I am not careful.
Beside a torroid on the mic cable, and maybe a foil/mesh cover over the recorder (maybe one of those new-fangled RF-ID protecting wallets), anything else I should try?
Bill W1PA
At 04:19 PM 4/15/2011, you wrote:
I am using an Olympus digital audio recorder for logging LEO passes, because I can directly transfer a .wma to my PC from it (versus the tape recorder I used in the 90's).
For logging? Or some other reason. I have been using pen and paper then transferring to the computer log file.
Hello Bill,
What does the manufacturer say ?
Maybe it is a defective unit. Replace.
Does it have a built in microphone ? Use the internal mic.
hardwire the transceiver RX channel to the audio input, with a suitable shielded cable.
Stan, W1LE Cape Cod
On 4/15/2011 5:19 PM, Bill W1PA wrote:
I am using an Olympus digital audio recorder for logging LEO passes, because I can directly transfer a .wma to my PC from it (versus the tape recorder I used in the 90's).
I am using an extension clip-on mic. I am finding that it generates a lot of RF crud on 435, enough to swamp the RX if I am not careful.
Beside a torroid on the mic cable, and maybe a foil/mesh cover over the recorder (maybe one of those new-fangled RF-ID protecting wallets), anything else I should try?
Bill W1PA
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Have you tried it without the clip-on mic? I used an Olympus recorder for quite a while with no problems. I hooked the speaker output of the radio through a "Y" connecter directly to my recorder and headphones. The first set of headphones that I used were of the "noise blanking" variety and were battery powered. When I transmitted the rf would wreak havoc with them. I switched to another set of standard headphones and that eliminated the problem.
Chuck, KM9U
----- Original Message ----- From: "Bill W1PA" w1pa@hotmail.com To: AMSAT-BB@amsat.org Sent: Friday, April 15, 2011 17:19 Subject: [amsat-bb] RF Quiet my digital recorder
I am using an Olympus digital audio recorder for logging LEO passes, because I can directly transfer a .wma to my PC from it (versus the tape recorder I used in the 90's).
I am using an extension clip-on mic. I am finding that it generates a lot of RF crud on 435, enough to swamp the RX if I am not careful.
Beside a torroid on the mic cable, and maybe a foil/mesh cover over the recorder (maybe one of those new-fangled RF-ID protecting wallets), anything else I should try?
Bill W1PA
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hi Bill!
I am using an Olympus digital audio recorder for logging LEO passes, because I can directly transfer a .wma to my PC from it (versus the tape recorder I used in the 90's).
I am using an extension clip-on mic. I am finding that it generates a lot of RF crud on 435, enough to swamp the RX if I am not careful.
Beside a torroid on the mic cable, and maybe a foil/mesh cover over the recorder (maybe one of those new-fangled RF-ID protecting wallets), anything else I should try?
Have you tried recording with just the mic on the recorder? Do you hear the crud without the extension mic? Have you tried using a Y cable and patching the audio from the radio to your recorder's mic jack and an earpiece or headphone?
With the way electronic items are manufactured these days, you may find that you aren't able to sufficiently cut down on the interference you hear around 435 MHz. Can you borrow another make/model of digital recorder and try it in place of your Olympus recorder?
I have used Sony digital audio recorders over the years, and now use the ICD-PX820 recorder. It may still be in production, or replaced by a newer model - something Sony, like other manufacturers, tends to do frequently. It has a mini-USB jack, works like a USB thumb drive with many computers (Windows, Mac, Linux) without using special software, and stores recordings in MP3 format. I have never had RFI issues with these recorders when working the satellites in the past 5+ years.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/
participants (5)
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Bill W1PA -
John Becker -
KM9U -
Patrick STODDARD (WD9EWK/VA7EWK) -
Stan, W1LE