Re: [Elecraft] K3S relay noise when using Rx ANT IN port

Just FYI, as Pablo, EA4TX confirmed the relay used for T/R switching to bypassing FEL while radio is transmitting has operating time in between 5-7ms and releasing time even 7-10ms if parallel diode is used. So it is not usable on CW ...if your K3 will start transmitting first element previously

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

David, the problem is that original KD9SV FES unit is not protecting your radio against the another RF power sources (SO2R or MM site operation)... FES unit is disconnecting ext. RX antenna and grounding the input RX port just when the unit is activated by own radio PTT signal. In that case the

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

This FEP is available in the UK: http://www.crosscountrywireless.net/receiver_protection_unit.htm OK1RR has a design for homebrew, based on KD9SV FES: http://www.ok1rr.com/index.php/technical-topics/39-yet-another-front-end-saver I have both of these and also an Array Solutions and a

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

But that would preclude allowing receive on the SubRX while transmitting - in other words SOTR operation. 73, Don W3FPR On 2/3/2020 5:58 AM, Dave B via Elecraft wrote: I'm somewhat surprised Elecraft don't just flip that relay into the "protect" position whenever the radio Transmits. Or at

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

I'm somewhat surprised Elecraft don't just flip that relay into the "protect" position whenever the radio Transmits. Or at least have a menu option for that relay's behaviour, that defaults to the "Safe" situation (RX made "Safe" during TX.)  But if you really do need to, able to be set so the RX

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

Dany, it looks like the RX-FES (KD9SV) and AS-RXFEP (Array Solution) protection units combined together... isn't it ? :) Are you using it in SO2R or Multi-Multi config? Ref: AS-RXFEP Limiter: https://www.arraysolutions.com/surge-and-rf-protection/as-rxfep RX-FESSS (KD9SV):

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

We use this unit during our portable operations https://ea4tx.com/en/tienda/frontend-limiter/trx-fel/ 73 Dany VE2EBK __ Elecraft mailing list Home:

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

I would cease operating with the RX antenna connected immediately before you damage your transceiver. 10m antenna separation is very close. I has a similar situation at my P40A station so I shorted the RX coax with a relay during transmit. GL, John KK9A M1FJL wrote: My K3S is configured

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

these in his contest station, it should be more than adequate. 73, Mark, WB9CIF -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Bob McGraw K4TAX Sent: Sunday, February 2, 2020 01:16 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S relay noise when using Rx

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

I use a surplus coax relay, one with BNC connectors, and it is triggered from the KEY OUT function on the transceiver along with the 12V source.   Be sure and use a diode across the relay coil to prevent back EMF.   The relay switches the RX ANT port to a 50 load, being a resistor mounted in a

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

Ray, Your transmit signal is getting into your RX antenna with more energy than is safe for the K3S. 10 meters is not much separation unless the antennas are oriented so one is not in the null pattern of the other. Using antennas that are of opposite polarization (such as a horizontal

Re: [Elecraft] K3S relay noise when using Rx ANT IN port

Ray That is indeed the protective relay on the RX Ant port. You should find a way to protect the RX Ant port from your TX signal. There are many products in the market for his purpose. Not sure of the best choice on your side of the Atlantic. 73 jim ab3cv On Sat, Feb 1, 2020 at 5:23 PM