tag:blogger.com,1999:blog-8085571700321121668.post6975433781848200541..comments2024-03-08T17:30:40.138+01:00Comments on EA4EOZ, an amateur radio electronic enthusiast: 137 kHz antenna preamplifierMiguel A. Vallejo, EA4EOZhttp://www.blogger.com/profile/04739647349389027008noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-8085571700321121668.post-56126024694932212762020-07-18T12:38:09.803+02:002020-07-18T12:38:09.803+02:00The gain is around 10 dB. But using it with a FT-8...The gain is around 10 dB. But using it with a FT-817 it is more important the filtering than the gain.Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-65809787585369574492020-07-18T03:33:36.532+02:002020-07-18T03:33:36.532+02:00hi miguel, I am very interested in the project you...hi miguel, I am very interested in the project you are making. I want to ask on the reinforcement side. what is the gain value generated by this amplifier?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-43509902023516173792014-12-02T21:04:39.919+01:002014-12-02T21:04:39.919+01:00This preamplifier will not work at all at 137 MHz....This preamplifier will not work at all at 137 MHz. It is designed for 137 kHz, kilohertz, not megahertz! Miguel A. Vallejo, EA4EOZhttps://www.blogger.com/profile/04739647349389027008noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-79797112843357704632014-12-02T20:26:37.013+01:002014-12-02T20:26:37.013+01:00Hi Miguel, Thanks for this article as it help'...Hi Miguel, Thanks for this article as it help's us out he in the North America. But there are a few changes that I had to make to your article because we here don,t have that amateur band in that frequency. But I used it on the weather satellites (NOAA) 137 - 138 Mhz and it work great. I will be distributing the modified article to our club members here in Canada if it's Ok with you. If you wish to email me at (ve3vxy @ bell dot net) I can then send the revised article.<br />73 Ralph ve3vxy Ralph ve3vxyhttp://www.ralphshobbyshop.comnoreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-13852666872275836352012-12-06T23:34:44.920+01:002012-12-06T23:34:44.920+01:00Thanks for your nice article and I did build it
w...Thanks for your nice article and I did build it <br />works as you said very good.<br />I used an CA3041 fet op-amp <br />but found the LH005 having lower noise<br />I receive DCF39 about 70dB above noise level in JO33hg (at 400km)<br />I found that my K9AY loop antenna has lost its directivity at 137kHz <br />The best s/n 70dB gives my inverted L for 160m the K9AY is 60dB s/npa0ohttps://www.blogger.com/profile/05064454183399874185noreply@blogger.comtag:blogger.com,1999:blog-8085571700321121668.post-63611834360472165652012-11-21T04:07:13.024+01:002012-11-21T04:07:13.024+01:00Interesting project. Good job
solving the intermod...Interesting project. Good job<br />solving the intermod on the<br />Yaesu.<br /><br />K9ZATnoreply@blogger.com