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FX: Knowing those DX-300's if you don't mute the rx and remove the antenna on transmit you'll most likely trash it. They have little or no AGC and zero protection on the front end. You made the observation already about little or no rejection from local broadcast stations...Logic dictates what might happen with 100+ watts sitting right next to it, plus hooked to the antenna as well.
The mute circuit in that receiver(I think) just turns off the speaker.
When I dabbled in Ancient Modulation years ago with an Allied RX and a DX-100 Griefkit
My set-up was Click-Snap-Click....
Click the RX to stand-by....
Snap the coax switch....
Click Transmitter to send....
Then Reverse!
Click transmitter to stand-by....
Snap the coax switch....
Click RX to receive....
It was pretty comical, but it worked...I also did CW that way...not exactly full break-in
All the Best
Gary

<blockquote data-quote="BJ radionut" data-source="post: 490503" data-attributes="member: 7026">FX: Knowing those DX-300&#039;s if you don&#039;t mute the rx and remove the antenna on transmit you&#039;ll most likely trash it. They have little or no AGC and zero protection on the front end. You made the observation already about little or no rejection from local broadcast stations...Logic dictates what might happen with 100+ watts sitting right next to it, plus hooked to the antenna as well.The mute circuit in that receiver(I think) just turns off the speaker.When I dabbled in Ancient Modulation years ago with an Allied RX and a DX-100 GriefkitMy set-up was Click-Snap-Click....<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big Grin&nbsp; &nbsp; :D"&nbsp; data-smilie="8"data-shortname=":D" />Click the RX to stand-by....Snap the coax switch....Click Transmitter to send....Then Reverse!Click transmitter to stand-by....Snap the coax switch....Click RX to receive....It was pretty comical, but it worked...I also did CW that way...not exactly full break-in<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f615.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":confused:" title="Confused&nbsp; &nbsp; :confused:"&nbsp; data-smilie="5"data-shortname=":confused:" />All the Best<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile&nbsp; &nbsp; :)"&nbsp; data-smilie="1"data-shortname=":)" />Gary</blockquote>

[QUOTE="BJ radionut, post: 490503, member: 7026"] FX: Knowing those DX-300's if you don't mute the rx and remove the antenna on transmit you'll most likely trash it. They have little or no AGC and zero protection on the front end. You made the observation already about little or no rejection from local broadcast stations...Logic dictates what might happen with 100+ watts sitting right next to it, plus hooked to the antenna as well. The mute circuit in that receiver(I think) just turns off the speaker. When I dabbled in[B][I] Ancient Modulation [/I][/B]years ago with an Allied RX and a DX-100 Griefkit My set-up was Click-Snap-Click....:D Click the RX to stand-by.... Snap the coax switch.... Click Transmitter to send.... Then Reverse! Click transmitter to stand-by.... Snap the coax switch.... Click RX to receive.... It was pretty comical, but it worked...I also did CW that way...not exactly full break-in:confused: All the Best:) Gary [/QUOTE]

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