Jerry is correct on all points. The FLEX-5000 has a stout front end and
it will take a signal in excess of 0 dBm to saturate the ADCs.
You should be OK unless the RX antenna is in the near field of the
transmitting antenna and you are running very high power. My antennas
are in the near field of each other (5' separation) and I have no issues
at 100 watts other than pegging the S meter on the RX2 :-)
If you are worried about it, then there are some devices that will
switch out the RX antenna when transmitting from companies like DX
Engineering and Heros just to name two.
-Tim
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FlexRadio Systems^(TM)
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On 8/24/2011 11:36 AM, Jerry Flanders wrote:
This has been discussed before, and Gerald posted some actual RF
levels that were known to be safe for the receiver front end. I would
simply measure on all bands and verify that my setup was below these
levels. Attenuate in some way if not.
Search the archives for the earlier posts on this and Google "flex
gerald w4uk level" and see my July 19, 2009 post for more.
BTW, lack of "muting" is not an oversight. In fact, unmuted
simultaneous receive is one of the features of the 5000 that Flex
mentions on 5000 features page
http://www.flex-radio.com/Products.aspx?topic=f5k_features : "The
FLEX-5000 was designed from the ground up to be a true full duplex
radio that can transmit and receive simultaneously without the need
for a second installed receiver. With this capability, the FLEX-5000
is positioned to be the ultimate CW rig ever made. For phone use, you
will be able to monitor your actual audio that is being transmitted
rather than using a monitor circuit in the audio chain. "
Jerry W4UK
At 10:48 AM 8/24/2011, John Wagner wrote:
All, As I understand this, when using RX2 with a receive-only antenna
( for
example) and the RX2 input configured to RX2 IN, there is no protection
for RX2 during transmit. The only time there is protections for RX2
occurs
when the input is set to RX1 Tap. Makes using a separate antenna on
RX2 a
potentially
harmful thing. I supposed you have to build/buy a external relay or some
other scheme.
Seems like a bit of an oversight.
73, John W8JJW
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