\u2026 But How? Time expended thus far, 2 weeks.<\/p>\n\n\n\n
I\u2019ve recently been playing a little bit on sideband on my IC-7300 and have been getting reports that i should check my station because it sounds like i\u2019m getting RF feedback into my radio. I\u2019ve been using the radio primarily as a data radio and participate in a nation-wide net. I have licensed the VARA-HF modem and have an SCS P4-Dragon 7800 Pactor modem.<\/p>\n\n\n\n
I normally don\u2019t do much on sideband but i do sometimes pick up the mic. Last week was the first time in a while. i got bad more bad reports, so i asked a local friend to do some testing with me and he hears the noise too. It is not as pronounced when I reduce power\u2026 my first clue.<\/p>\n\n\n\n
To test on my own, i dusted off another radio and found a free frequency and transmitted at 100 watts and 5 watts and confirmed the issue. I then started disassembling stuff to isolate the problem. I took the deep cell batteries out, disconnected the charger uncoiled coax\u2026 everything i could think of. I even changed antennas to no avail.<\/p>\n\n\n\n
Then it occurred to me to start removing cables from the radio itself. I removed everything except the antenna coax, the mic and the power and performed the test. No RF interference. I got John to confirm. Then, one-by-one, i started hooking the cables back up to the radio. The speaker, tuner, and USB interface to the computer were not the issue, the interface to the SCS pactor modem is.<\/p>\n\n\n\n
The pactor modem is a fairly new addition to the station and it works decent. Little did i know that the interface cable was allowing RF feedback into my radio. I added it to the station back in the spring. Apparently running 5 or 10 watts for data comms weren\u2019t affected by it much. I was able to send and receive data and participate on the net. When i increase power and talk sideband, that\u2019s when the issue crops up. So now it\u2019s time to investigate thee interface cable, it\u2019s a premade cable that i purchased when i got the modem, i\u2019m likely going to need to build a shielded cable.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u2026 But How? Time expended thus far, 2 weeks. I\u2019ve recently been playing a little bit on sideband on my IC-7300 and have been getting reports that i should check my station because it sounds like i\u2019m getting RF feedback into my radio. I\u2019ve been using the radio primarily as a data radio and participate … Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-204","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/posts\/204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/comments?post=204"}],"version-history":[{"count":0,"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/posts\/204\/revisions"}],"wp:attachment":[{"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/media?parent=204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/categories?post=204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/n2xu.net\/index.php\/wp-json\/wp\/v2\/tags?post=204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}