Joe N9JR wrote on Saturday, April 22, 2006 11:10 PM
I have an issue on 30m receive only. When I transmit on 30m I get full
power, and it receives normal, but after a while it loses most of its
sensitivity. Transmit again and it will hear the other side of the earth.
I have noticed that onc
Dude,
You are indeed the King. Let me press forward with your suggestions. I'll
let you know what I find.
Joe N9JR
Don Wilhelm <[EMAIL PROTECTED]> wrote:
Joe,
Not the counter probe - use an RF Probe or a 'scope - the significant factor
is the RF voltage, the counter probe will on
I have the same problem on one of my 40M dipoles, hears good for a while
and then the signals go way down. One tap of the key and receive is
restored. I know the problem is at the remote coax switch, most likely some
corrosion at the coax connector. I've had the problem in the past with
another
Joe,
Not the counter probe - use an RF Probe or a 'scope - the significant factor
is the RF voltage, the counter probe will only provide the frequency and I
expect that will be correct.
What you may be encountering is low injection to the mixer - the level
should be +7dBm for the TUF-1 mixer - if
Thanks Don,
I'll move the probe to TP1 and see if it changes when receiver sensitivity
falls off.
I thought that if VCO voltage was low PLL lock would be lost. When this
happens, the PLL stays locked, as verified by listening to stronger stations.
Also the VCO/PLL chain is before a
Joe,
Try checking the RF voltage out of the VCO (at TP1) - compare 30 meters to
40 and 20. If the 30 meter output is low, that could be the major cause of
your problem. If this is the situation, look first at the voltage at R30
for clues. Normally the 30 meter VCO alignment falls quite within r
Thanks Vic,
But its not the antenna or coax. I had already tested it, besides being a
multiband vertical it shouldn't happen on only one band. According to the 259B
my SWR is 1.2:1, and brand new coax from the antenna to the switch.
Thanks for taking time to give me your advice,
Joseph Reed wrote:
I have an issue on 30m receive only. When I transmit on 30m I get
full power, and it receives normal, but after a while it loses most
of its sensitivity. Transmit again and it will hear the other side
of the earth. I have noticed that once it goes partially deaf I can
get
I have been pulling my hair out for about a month with this problem, and
perhaps someone has seen it before and can point me on the right path.
I have an issue on 30m receive only. When I transmit on 30m I get full
power, and it receives normal, but after a while it loses most of its
sen
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