Apache Labs Community Forum

A friend has two HPSDR radios and plans to use both independently but through an SPE V3 amplifier.

Radio 1 (Anan7000dle) goes into input1 and uses the -60db tap off the amp back to BYPASS. Output1 to the antenna.
Radio 2 (HL2) goes into input2 and uses a directional coupler xtronic on the Output2 and feeds a sample back to RX3 in the HL2

Not tried as yet BUT If radio2 is used and radio1 was switched on/off could any damage take place as I presume it will still be feeding the sample into Anan7000

Many thanks in advance.

Logic would suggest that if the signal strength from the -60dB tap isn't great enough to harm radio1 while it's running then neither should it be harmful when it's not running.

Mark

There will be no problems with this, for the reason that Mark already gave.

Instead of what he did, your friend could very have easily provisioned a 3dB splitter (not a T, but a real, low loss, hybrid splitter) on the amp coupled output. Example: Mini Circuits ZFSCJ-2-1. There are usually lots of these, or similar ones, available on eBay for $20ish dollars, give or take. They work great. I used one to split my GPSDO 10MHz output.

Or, for a lower loss solution (because the -60dB coupling factor of the SPE amps is already 10dB too low for optimum performance) he could have used the SPE AUX connector "/EN" signals to automatically direct an RF switch to feed the amp coupled output to radio 1 or 2 as appropriate. There always lots of Dow-Key coaxial relay switches for sale on eBay for not much money.

Thanks gentleman for taking time out to reply, all welcomed.