In the past on the SDR-1000, I have noted a tendency to loss WBIR image
rejection in conjunction with switching transients from relays. (ADC's
saturating with transient pulse ?? ) . Does the image rejection still
fail if the LT2S is not keyed but 1500 still cycled? Does the LT2S have
a relay 'kick' on it's keyline ? Does the image rejection fail if the
LTS2 is keyed but the RX signal is not routed to the 1500 ??
Al, K0VM
On 8/11/2011 10:15 AM, Brian Lloyd wrote:
On Thu, Aug 11, 2011 at 4:30 AM, Christoph Petermann<[email protected]>wrote:
Hello
There it is my problem:
I am running the Flex-1500 with a transverter (SSB LT2S) on 2m with VAC and
WSJT. It does a wonderful job; at least I hoped so it would do, because
after EVERY transmission Image Rejection stops working and I am getting
stations into the passband that are not there. Very, very much annoying. I
can stop this by band switching (2m> 40m>2m). But this is not the way to
solve this every transmission period and loosing 8 seconds of a 30 seconds
period. It very rarely happens when running WSPR on 40m, but it does happen
too. Is there a way to come around this ? Running 2m Meteorscatter or EME
with the Flex-1500 is phantastic - but rather very useless as it is now. It
is the same on my other computer - no difference seen so far.
Any idea how to proceed ??
I have also experienced this problem and reported it to Flex. It appears to
be a failure in the Wide Band Image Rejection (WBIR) algorithm. In my case
even the band-switching doesn't solve the problem after awhile. I need to
stop and restart PowerSDR to recover. It has made the 1500 pretty useless
for WSPR, which does automatic transmissions and band-switching.
Flex is working on the problem. I hope they find the solution soon as it has
caused me to shelve my 1500 until the problem is fixed. I am lucky because I
also have a 3000 and a 5000 to play with but not everyone with at 1500 has
that luxury.
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