If I have a legal limit output on 1 antenna on ant1 output through an amplifier and ant2 port is a separate receive antenna, NOT in full duplex mode, is it safe to transmit 1kw+ while the rx antenna is in the near field.
Example tx ant is a horizontal 900 foot loop with 1500 watt capability
rx antenna is a dipole for example with both the loop and dipole within 20 feet of each other.
Are there any internal safety mechanism or relay activity that isolates the RX from the TX port during transmit operations? I am NOT in full duplex mode nor will I be while using amplified power.
I just don't want to blow ant2 port in RX mode while TX on my amplified ant1 port.
There are some nights on low bands where I rx better on a dedicated antenna other than the loop.
DX Engineering sell a nice device I have on my FLEX 6500
DX Engineering Receiver Guard Electronic RF Limiters are the best limiter devices to choose when your receive antenna input could be subjected to high levels of RF. The DXE-RG-5000HD and DXE-RG-5000 are specifically designed to protect a sensitive receiver front-end against high levels of RF from nearby transmit signals. DX Engineering Receiver Guards are a must for multiple radio contesting stations and they provide low-cost front-end "insurance" in these common high-RF situations, among others:
- Receive antennas in very close proximity to transmit antennas
- Field-day operations with many transmitters in close range
- Multi-transmitter contesting sites
- Neighboring Amateur and CB operators
- Frequent high-power mobile encounters
Extensively tested and proven in real-world stations, now DX Engineering offers two Receiver Guards, to provide automatic protection for every receive equipment application:
- The new DXE-RG-5000HD works for all radios and offers the ultimate performance required by the upper tier of transceivers tested to have the best narrow-spaced third-order dynamic range or published RMDR (Reciprocal Mixing Dynamic Range). These transceivers include Elecraft K3 series, FlexRadio 6700, 5000A and 3000, Icom IC-7851, Kenwood TS-990S and 590S(G), TenTec Orion series, Yaesu FTdx-5000 series, and other radios with similar performance.
- The original DXE-RG-5000 offers excellent dynamic range and performance characteristics to cover the capabilities of all other transceivers and receivers.
At the heart of each Receiver Guard is a highly effective electronic RF limiter covering 500 kHz to 150 MHz with an insertion loss under 0.15 dB at 50 MHz and under 0.3 dB to 150 MHz. Their multi-stage design includes a gas discharge tube for maximum pulse energy protection. These are passive electronic limiters, not filters, so competitive contesting stations still use separate band filters. For example Receiver Guard limiter model DXE-RG-5000HD can reject 10 watts of catastrophic receive antenna feedline RF while passing a signal of about 87 dB over S-9, which is only 25 mw! That level is well under the point of front end damage. When there are high levels of RF on your receive antennas, DX Engineering's Receiver Guards generate far less harmonic noise than other limiters on the market, which allows your station to continue to operate safely and competitively. At normal HF signal levels Receiver Guard operates continuously with no effect on the performance of your station while providing the best possible protection for your radio.
Here are Receiver Guard features:
* Keeps stray high levels of RF from damaging your receiver input
* Ideal for separate 160 and/or 80 meter receive systems with large pulse and RF energy capture area
* Uses state of the art components for maximum protection of receivers
* Under 6 ns response time
* Multi-Stage protectio
it sells for about 85 plus shipping
I have my mine hooked up and working great
Think of a 10-Watt soldering iron to estimate the heat 3-Watts might generate in a 50-Ohm load (your receiver).