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Besides the swing mod used for this chassis with the RFX 75, the receive and noise blanket diodes can also be upgraded with the Schottky 1N6263. No radio re-alignment necessary.

Putting in a larger filter capacitor (largest cap found nearest the power plug) will help keep more noise out and act a bit like a stiffening capacitor for transient peaks when transmitting. You can also put in a larger filter cap near the audio IC.

Have you done any audio improvement mods? There are some found on this thread:
http://www.worldwidedx.com/cb-radio-modifications/31449-cobra-29-high-power-mod-2sc1969-transistor.html

If you are gauging the output of the RFX 75 with a Dosy meter; then it is possible that you are really over-driving it and it may prematurely fail. Check it with a true peak reading watt meter; it will give the real picture.

Like to hear what you find out when you change out that diode.

<blockquote data-quote="Robb" data-source="post: 396151" data-attributes="member: 8446">Besides the swing mod used for this chassis with the RFX 75, the receive and noise blanket diodes can also be upgraded with the Schottky 1N6263.&nbsp; No radio re-alignment necessary.Putting in a larger filter capacitor (largest cap found nearest the power plug) will help keep more noise out and act a bit like a stiffening capacitor for transient peaks when transmitting.&nbsp; You can also put in a larger filter cap near the audio IC.Have you done any audio improvement mods?&nbsp; There are some found on this thread:<a href="http://www.worldwidedx.com/cb-radio-modifications/31449-cobra-29-high-power-mod-2sc1969-transistor.html" target="_blank">http://www.worldwidedx.com/cb-radio-modifications/31449-cobra-29-high-power-mod-2sc1969-transistor.html</a>If you are gauging the output of the RFX 75 with a Dosy meter; then it is possible that you are really over-driving it and it may prematurely fail.&nbsp; Check it with a true peak reading watt meter; it will give the real picture.Like to hear what you find out when you change out that diode.</blockquote>

[QUOTE="Robb, post: 396151, member: 8446"] Besides the swing mod used for this chassis with the RFX 75, the receive and noise blanket diodes can also be upgraded with the Schottky 1N6263. No radio re-alignment necessary. Putting in a larger filter capacitor (largest cap found nearest the power plug) will help keep more noise out and act a bit like a stiffening capacitor for transient peaks when transmitting. You can also put in a larger filter cap near the audio IC. Have you done any audio improvement mods? There are some found on this thread: [url]http://www.worldwidedx.com/cb-radio-modifications/31449-cobra-29-high-power-mod-2sc1969-transistor.html[/url] If you are gauging the output of the RFX 75 with a Dosy meter; then it is possible that you are really over-driving it and it may prematurely fail. Check it with a true peak reading watt meter; it will give the real picture. Like to hear what you find out when you change out that diode. [/QUOTE]

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