The RF Sense MFJ type of switch box are cheap but do have limitations. The DX-Engineering RTR-1 is a bit more money but is considerably more user friendly with some added features like being able to check the RX antenna vs the TX antenna either with a momentary toggle switch or with the same switch in the up position which immediately reverts back to the TX antenna for RX. I have two RTR-1's in the shack and they are well Engineered for the discerning low band DX-er with status lights and front panel control in a box in front of you. It also has the PTT safety lock out feature.

Herb Schoenbohm, KV4FZ

On 9/22/2016 4:33 PM, Charles Moizeau wrote:
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View two products from MFJ enterprises, MFJ-1707 and MFJ-1708.


Charles, W2SH

From: Topband <> on behalf of Gabriel - EA6VQ 
Sent: Thursday, September 22, 2016 1:27 PM
To: 'Topband'
Subject: Topband: RX / TX antenna switching

I will appreciate your advice in the best (but simple) way to switch between RX 
and TX antennas for a transceiver that does not have a separate RX antenna 

The system should be able to switch from RX antenna to TX antenna when PTT is 
applied (and vice versa) but also allow to switch between the two antennas 
during reception in order to compare.

I have thought about using a coax relay as I do switch the VHF preamps, but I 
think it's switching will possibly too slow and some RF could flow to the RX 
antenna, causing damage.

Any ideas will be welcome!

73. Gabriel - EA6VQ

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