Dale Parfitt schrieb:

Cool, that beats my picking up 50 kw Radio Orbita 3 from Russia or the
African channels (Botswana and Nigeria) booming last night.

Not bad for a sony 7600GR portable eh?

I figured out the image problem. I think it's the voltage limiting
diodes I place yesterday across my antenna input to ground.

That is exactly what it is assuming yor RX uses a 455 kHz IF.

Which, btw, it does. And it doesn't have too great an image rejection
either (~40 dB). When using a big antenna with a 7600G(R), I'd advise a
passive preselector / antenna tuner, not only for better image rejection
but also against IM products (here in Central Europe signals are strong
enough to produce IM products on the whip alone). It's a lot of receiver
for the money, but in no way an AR7030+... (Except for AM demodulation,
that is - this sounds rather crappy and distorted on the AOR, but that's
what the excellent synch is for.)

Stephan
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On Wed, 24 Sep 2003 15:47:10 +0200, Stephan Grossklass
wrote:

Dale Parfitt schrieb:

Cool, that beats my picking up 50 kw Radio Orbita 3 from Russia or the
African channels (Botswana and Nigeria) booming last night.

Not bad for a sony 7600GR portable eh?

I figured out the image problem. I think it's the voltage limiting
diodes I place yesterday across my antenna input to ground.

That is exactly what it is assuming yor RX uses a 455 kHz IF.

Which, btw, it does. And it doesn't have too great an image rejection
either (~40 dB). When using a big antenna with a 7600G(R), I'd advise a
passive preselector / antenna tuner, not only for better image rejection
but also against IM products (here in Central Europe signals are strong
enough to produce IM products on the whip alone). It's a lot of receiver
for the money, but in no way an AR7030+... (Except for AM demodulation,
that is - this sounds rather crappy and distorted on the AOR, but that's
what the excellent synch is for.)

Stephan


Hmmm...guess the diodes are not such a hot idea after all.
Easy enough to desolder and remove them. That would leave my 2.2k ohm
resistor as a bleed off inside my antenna tuner. I will order a gas
arc breakdown tube for major voltage impulses and be done with it.
Or alternately, should I run into a pile of cash sometime soon, buy an
ICE model 197 RF limiter/arrester.

mike

"mike" wrote in message
...

he,he
Yes, I think the antenna has something to do with it. It was WWCR on
3210 causing a harmonic (?) on my sony. Thats nearly 1khz off. This
happened several times tonight with those domestic based powerhouses.


It could be mixing with a local AM station. 3210 - 2300 = 910 khz. Of
course if that's the case you should probably be able to hear the
programming from both stations at the same time, as I have with local AM
stations.

--
Tom Sevart N2UHC
Frontenac, KS

http://www.geocities.com/n2uhc