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(1) Browsers: Preferably use a browser that supports HTML5. If this is not possible, you will need a browser that supports Java (eg Internet Explorer).
This WebSDR is optimized for Chrome, but Edge also works well. This WebSDR is optimized for Chrome, but Edge also works well. Firefox works, but on some platforms the buttons are huge - I've tried suggested fixes
but so far haven't. Mobile browsers are automatically detected and you will see a link to the mobile-optimized version of WSDR if you prefer to use this.

(2) GUI:You will notice that the GUI is not standard. I've extensively modified the basic html client to make the GUI as user-friendly as possible - hope you'll agree it's an improvement over the basic configuration used in many WebSDRs.

(3) Tool tips: Mouse over most controls to display tools. tips

(4) Cascade and Sound Options: depending on your browser's support, select HTML ou JAVA using the buttons above the cascade
  (a) these buttons are dimmed and inactive if your browser does not support the associated option
  (b) recent Most browser versions no longer support Java, even when installed and enabled correctly - in this case HTML is selected by default
  (c) if you have radio buttons active, HTML is preferable for waterfall and sound.
  (d) if your browser does not support HTML5 sound (eg Internet Explorer) try selecting Java ( Java and JavaScript must be enabled )
  (e) if you still don't have sound, make sure you have Java version 1.4.2 (or later) installed.

(5) Tuning: Drag the center of the yellow pass band marker, roll the mouse wheel (when the cursor is on the adjustment scale) or click on the frequency box Enter from keyboard.

(6) Bands: This WebSDR currently covers 160m, 80m e 40 m

  (a) You can change tracks by clicking the desired band button.   .Or, if you are viewing multiple bands,
       just click on the required frequency scale.
  (b) When you change bands and then return, your original frequency is remembered.
      Unlike most other WebSDRs, WebSDR also remembers its mode and bandwidth, making it look more like a real radio

(7) VFO's: The concept of a VFO exchange system is used by many physical radios.Similar functionality in a WebSDR was pioneered by Pieter (PA3FWM) at the University of Twente WebSDR
Credit goes to Pieter for the inspiration to provide a VFO exchange system in WebSDR,the HTML for the A⇆B and B = A  buttons on this site is, however, original.

  There is only one main VFO, the sub VFO is actually just a memory labeled VFO B to maintain some resemblance to a physical radio.
  This system allows you to quickly switch between two stations of interest on different frequencies (and/or bands). Each VFO can also have a different pass-through bandwidth and mode than the other.
  (a) VFO A is the main vfo that is selected by default when you arrive at SDR. . All reception settings (frequency, mode and bandwidth) are applied directly to VFO A and the signal you hear comes from this VFO
   b) NEW FEATURE: When closing SDR, your last usedVFO , frequency, mode and bandwidth are remembered in a cookie.Your chosen Band View and Band Label visibility is also remembered. This best emulates a physical radio, where you can easily go back to where you left off the next time you turn it on.
(c) VFO B is simply a copy of VFO A that you can update by pressing the B = A  button at any time   
(d) you can switch (switch) between VFOsby pressing the   A⇆B . button. Each sub-heat pushes between the two VFOs   
(and) the B = A button is also an indicator; the label state indicates the status of VFO A & VFO B compared to each other:
    BOLD B = A Label indicates that VFO A and B settings are the same      NORMAL B = ALabel indicates that one or more VFO A and B settings are different

ATTENTION ! VFO A is what you are currently listening to and VFO B is a copy made from VFO A last time you pressed B = A or A⇆B

(8) Áudio Bandwidth (Passband): Soundtrack and adjacent channel QRM can sometimes be reduced by choosing a narrower passband. Wider bands give greater "fidelity", but only if the signal-to-noise ratio is sufficient;
(a) Coarsely adjust the passband; Click on a suitable Bw suitable Bw preset . Appropriate presets are shown for each mode.   
(b) Bw Trim knobs provide more accurate 100Hz adjustments that are evenly split between LF and HF trim.
  (c) If you need to adjust the LF and / or HF cut separately, you can drag the edges of the filter   / \    on the tuning scale.

(9) Memories: Memories in WebSDR store the current VFO A settings (freq, mode, bandwidth) in successive numbered locations in the memory table. I've enhanced the original memory management panel to make memory management simpler compared to most other WebSDRs.

Initially , all memories are empty and memory status indicator will show   mems ok tot 0  

NOTE: Unlike most WebSDRs, the A> N  write new memory button is always at the top of the table and
the memory table grows down from it.

The first memory location is numbered zero. The status indicator is updated as you perform memory operations, for example:   M5 stored at 6  
Always displays the last memory operation and the current number of available memories.

Memory operations are as follows:

  (a) Press the write new memory button ; A> N at the top of the table to store settings in your memory table.
  (b) Pressing any of the update buttons ; A> M will overwrite the previous memory contents associated with your current settings.
  (c) Copy from any memory to VFO A by pressing a read button ; M> A or by clicking the green memory indicators
  (d) Any memory can be cleared by pressing the associated MX button .
  (e) Memory numbers are shown in the left column and are renumbered whenever you store or erase memories.
  f) Memory tags can be inserted if you prefer meaningful memory tags instead of numbers
  (g) Memories are non-volatile and are stored in your browser's 'local storage' and retrieved the next time you connect to SDR.

Subsequently, when you reconnect, the status indicator will display   mems ok tot X,    where X is the total number of memories available.

(10) ID: Feel free to enter a valid ID in the ID box. This is not mandatory, but your IP is displayed in the list of logged in users if you leave the ID blank.
The following are NOT valid IDs. You will unfortunately have to be blocked if you insist on entering any of them as your ID;
  (a) unbreakable space codes in an attempt to hide. Administrator can see ALL IPs regardless of ID. Unfortunately, if you do, I'll assume you're trying to hack
  (b) a URL or email address - no links, commercials or advertisements, please.
  (c) obscenities and/or obscene acronyms - please keep your civil ID

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