Mon DU1FV

 735 backlight reg slow on

 Gonza735 no finals

  Optimum power setting on SSB. Tree on Single Sideband Remember: just 30 watts for a 100 watt rated radio and similarly, just 300 watts for a 1000W rated amplifier. NEVER EVER WHISTLE!!!

 Visualizing the operation of SSB filters Many pre 2000 HF radios are double conversion on TX and triple conversion on RX. a popular crystal filter IF freqeuncy is 9MHz. The BFO (beat frequency oscillator works at the same frequency . HOwever some method (usually involving capacitors) is used to slightly change the exact frequency to either 9.013 Mhz or 9.010 MHz. Here is an illustration on how, in the TX mode, the desired sideband is chosen. For example we want to transmit USB on 14MHz. To achieve this, we have the produce a double sideband signal using a 9.013 carrier frequency. This double sideband signal is made to passthrough the crystal filter. Only the LSB will appear on the output of the filter. The USB signal will not allowed to pass through. This is because of the carrier frequency we used. (If we had chosen a different carrier frequency , for example 9.010, the double sideband output will be entirely shifted down up. And if we pass this through the crystal filter, ...

DAIWA Cross Needle CN-410M   Repaired my decades old DAIWA Cross Needle CN-410M. I used a working meter movement from a damaged V and U version a good friend gave me many years ago.

  Blown finals:  these are the two most dreaded words   Blown finals:  these are the two most dreaded words that a radio owner wants to hear, but it is a sad fact that too many radios end up with this condition. If only radio heatsinks were double or triple the size, the finals will stay cooler and last longer. But then they would be more expensive because of added materal and shipping cost. The picture shows two devices that will keep things cool. The water cooler is perhaps extreme as it is very difficult to make. It requires machine shop skills to mill aluminum well. However the temperature monitor device is a very affordable accessory that most homebrewers can construct. You can even rig a relay and fan to it. FM rigs suffer most from blown finals because of the duty cycle -100%. IF you use SSB, the radio will be cooler but SSB has never come close to becoming mainstream as a mobile "daily driver". DMR is a good choice if you are looking for a new mobile. Since i...

  Talking on ham radio bands. Many of us remember the very first time we had to press the PTT button and speak into the mic. For some, it was second nature but for many it took a little bit of will power as many are mic shy. If you have been able to take the bold step of talking over the radio, Congratulations! For the rest, be patient. Getting to be a good radio speaker , as with speaking in public takes time. In Ham Radio we have a tradition called the QSO party. IT is when at certain festive occasions like New Year's Day, many hams congregate at one freequency and do a meet and greet. Come to think of it every QSO (radio converstion) you have is a QSO party because aside from you and the station you are taking to, many others are listening in the background, just like if you were having a converstion in a real party. IF you limit yourself to rubber stamp QSOs (which follows a script), there will be no problem in getting a lot of QSOs. But things will be slightly different when ...

  'I won't let you in!' by A. Radakov, USSR, 1925 (The wife says )'I won't let you in!' by A. Radakov, USSR, 1925  (The sign over the entrance is 'Everything for radio' and dude's holding 'Radio' magazine) (The wife adds) "No more Ham radio gear!" (1925 was just 7 years prior to the licensing (by the U.S. Dept. of Commerce) and operation of University of the Philippines Radio Society of its club radio station KA1UP in January 1932.

Websdr with no sound? A Google Chrome update has blocked audio from unsecured sites (made default) including some websdrs like my favorite http://hackgreensdr.org:8901/ . Here is what to do to get the sound back. After making the changes be sure to reload browser. Photos and ideas by Tony G1HMO 29/8/2019.