Ideas for modifying the Icom IC-720 from rotary switched LPF to discrete relay type:



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First "Fun with Morse Code" Inter highschool Contest photos

Imahe
The First "Fun with Morse Code" Inter highschool Contest - Mandaluyong Girl Scout Council with 480 Homebrewers DX1HB. Ten high schools participated. Mandaluyong Science High School won first place.  Congratulations ! True to the contest title, all girl scouts had a Fun day, from fist warm-up to awards ceremony! Icom IC-735 sidetone used as oscillator, VOX off) with German Junker straight key. Photos by Maria Teresa Rdy
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Kenwood HF-50Mhz TRansceiver TS-680V Review Digest

Imahe
Kenwood shortwave 50Mhz base equipment, TS-680V This is the rig that you have purchased a used will want after purchasing a new article, but also I have rung the local after a while. The unit was purchased used. Rather than a full-fledged HF machine, it is an entry-level radio if anything, but it is rig for convenient simple operation. 　In addition, we inherited the traditional TRIO Kenwood sound, even if I have listen for a long time, it is not tiresome to the ear. Device-specific problems are not inherited in the traditional colors of the TRIO walkie-talkie. Model number is also ◎ They discuss pulling the tradition of TS-600. 　It has come in handy and check the band condition, local ragchew, and mobile operation. Condition is excellent for local bands like communication, mobile .... And features To proceed normalKenwood shortwave 50Mhz base equipment, TS-680VKenwood shortwave 50Mhz base equipment, TS-680V, even with the machine of HF, the knob has been placed tig
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Hot-Rod Your ICOM IC-725-Series Transceiver by Jukka Vermasvuori

Imahe
Hot-Rod Your ICOM IC-725-Series Transceiver Part 1  by  Jukka Vermasvuori   OH2GF Receiver Issues The receiver in my IC-725 exhibited these drawbacks: Its audio frequency response was too narrow, dropping 6 dB from its maximum by about 2 kHz. High-end rolloff that is this profound filters out speech energy necessary for good SSB intelligibility and severely muffles AM broadcast signals, which carry audio up to at least 4.5 kHz. 4 The AM-mode audio had a “mega bass” quality. The level of in-band intermodulation products seemed to be quite high. 5 On CW, I could hear weak phantom beat notes from out-of-passband signals. The pitch change of these spurs was the opposite of that of desired signals during tuning. In effect, a strong signal would come back into the receiver passband if I tuned in the right direction. Although these spurious signals were weak, they sometimes disrupted communication as I worked weak DX stations in crowded bands. During CW reception with th
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