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Old School Setups With External Tr Switching?

M

mr_fx

Sr. Member
Oct 8, 2011
1,536
172
173
Kansas City
I am getting ready to setup a Heathkit Marauder HX-10 transmitter and my Realistic DX-300 reciver, I am planning to run separate antennas for the Transmitter and the Receiver... and eliminate the T/R relay
/
Basically I figured Receiver muting would accomplish everything in this case right?

will this plan work ?
 

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....: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
 
I wouldn't do it for the reasons BJ already mentioned. I know of three DX-302's (basically the same thing) that had the frontends creamed while using a separate antenna while using the MUTE function. If you can wire a relay to short out the antenna DIRECTLY at the antenna terminals of the receiver then maybe I would do it.
 
BJ radionut said:
It was pretty comical, but it worked...I also did CW that way...not exactly full break-in:confused:
Click to expand...

What do you mean not full break-in? By the time you finished a couple contacts you were fully broken in. :p I did that for a while with the DX-60B and HR-10. Ever notice that every time you do something repeatedly over and over again without any thought as to how simple and mundane it is that after a while you start to do the exact opposite? Like shelling peas. After a while you start throwing the pods in with the good peas and the peas in with the pods. Yup same thing working that old CLICK-SNAP-CLICK routine. It started to become SNAP-CLICK-SNAP after a while and I was not getting any responses to my calls. My plate current was a little wonky too until I realized the antenna was connected to the RX during TX and to the TX during RX. :confused:
 
If you do not mute the receiver, you will very rapidly find out that your transmitter smoked the front it of it. See if you can find an old Heathkit Mohawk RX-1 which matches the Heathkit Apache transmitter. Then you can use the Dowkey the way it was intended to. The big reason being the 300 was never intended to be true ham receiver.
 

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