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About borjam

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    Bilbaina Jazz Club
  • Interested in Sound for Picture

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  1. Not intending to be fastidious, but you don't need a directional bridge if you just want to measure the total loss through the splitter.
  2. So I got a Rodecaster for some podcasts and live panels for my association and I just returned it. At least then plugging headphones on the front jack (the small one) and setting a high gain on channel 1 (I was using a Sennheiser MD441 for testing) I had some unpleasant "helicopter" interference that went away when using a phantom powered condenser microphone on another channel, and there was some AC hum present whenever I touched the screen. That only affected channel 1, not the other three. The microphone is fine (I use it every week at the club) and the cable is good
  3. I wouldn't recommend at all to mix different digital wireless systems on ISM (Industrial, Scientific, Medic) bands. Each one of them may implement completely different spectrum arbitration/management features. And if I recall well, the Deity protocol might be somewhat of a bully, at least nudging (ahem!) WiFi networks to steer clear.
  4. I know two sources that may design those filters. One of them is in Italy and the other one in Greece. The prices are from cheap to reasonable. The first one is a radio amateur in Greece who is selling some nice products. I am quite sure he would take custom orders and, besides, this area would be a promising market for him I think. While his products are more oriented to the diy amateur radio operator, I am sure he can supply finished products for end users. http://www.sv1afn.com The other one is in Italy. He is actually selling filters for pr
  5. Anything Ethernet based is so flexible. You can even use fiber instead of twisted pair. It’s much thinner and depending on the type of transceivers and fiber you use it can run for several Km while twisted pair is limited to 100 m.
  6. The main difference between the two antenna types is bandwidth. Log-periodic antennas are useful over a much wider range of frequencies. That’s the reason, I imagine, why the so called shark fin antennas are so popular for radio mics.
  7. I would say he is in Spain, gathering swift sounds for a sound background. (Several Spanish productions feature really conspicuous swift sounds, which is actually a nice detail because they are really loud in Spring and Summer)
  8. Wow, just got an email from Sound Devices announcing firmware version 7 and an additional feature for the II Series: A Noise Assist plugin at $300. Previously it was MixAssist. So, I guess MixPres are doubling as an entry level hook for the Sound Devices "drug"
  9. But a RTL dongle lacks the analog filters before the ADC present in a real spectrum analyzer. As far as I know RF Explorer is a ˝classic" spectrum analyzer with a mixer and a sweeping local oscillator. That configuration improves the dynamic range. No matter how good your digital domain filtering is, if the ADC gets overloaded, game over
  10. I understand that it's fun, but beware: All of the computer based SDR software I have tried is fiddly. And I own three more serious SDR units. You know better than me how expensive shooting time is The worst problem with a RTL used as a test instrument is, however, dependability. These units don't have very good front end filtering, and in the presence of strong out of bands signals they might show ghosts that would not be a problem for properly filtered wireless equipment. So, using something like the RF Explorer is more dependable and predictable. RTLs are great for
  11. No I didn't, as the kludge worked for me and I haven't had much time to go outdoors and recording this Spring 😕 I'll do it this week, after all being confined at home...
  12. It's just reducing probability. Someone with mild symptoms can have some fever.
  13. borjam

    Jay Rose

    Oh I am really sorry! I only exchanged a message or two with him but it was clear to me how knowledgeable he was, how generous sharing his knowledge and what a gifted technical writer he was. My condolences.
  14. The NeXT Cube I have at home has a 450 MB hard disk. That was a huge disk in the late 80's And I remember back in 1991 we ordered a couple of 750 MB disks from the USA. Large Maxtor drives weighting a ton, the interface was SCSI probably. I think they were $2500 each. At that time it was worth ordering directly from abroad, in Spain prices for this stuff could be 2x or even 3x.
  15. At high sound pressure levels ultrasounds can produce audible sounds when colliding with objects. The transition between different mediums (air and a solid body) creates a non linear effect. For example, it is possible to beam an AM modulated towards a wall. The beam will be demodulated and the modulating signal will be heard like it originated from a spot on the wall. https://en.wikipedia.org/wiki/Sound_from_ultrasound I have seen it working, a friend was experimenting with this some time ago. I guess it will provoke a similar phenomenon on the
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