[TenTec] Narrow signal on 28.027620 MHz

[Phil Sussman]

Having this type of problem of my own more than once in the past, I first 
isolated the problem by disconnecting the antenna. When the carrier did not
disappear, I disconnected everything connected to the rig -- but to no avail.

Then I shut down everything in the vicinity, FAX machine, typewriter, adding
machine, and anything else electronic. Still a carrier! My frustration was 
evident until my wife moved the new baby monitor which had been moved into the
radio room. Carrier gone! I suggest looking at your surroundings.

In the past I've had interference from computer monitors and keyboards, which
were resolved only by replacements.

Good luck!!

de Phil - N8PS

-------------------

Quoting Ken Brown <ken.d.brown at hawaiiantel.net>:

> 
> > It does not go away; same signal strength (I'd give it about a 7 on our 
> > RST scale).
> >   
> > I don't know how to add attenuation at the antenna; are these the step 
> > attenuators I've seen that some QRP operators use to reduce their output 
> > power?
> >   
> Since it does not go away when you disconnect the antenna, adding 
> attenuation to the antenna port is not going to tell us anything. The 
> signal is something generated within the receiver. It is either the 
> product of the mixture of oscillators and clocks all generated inside 
> the receiver, or it is possible that there is something getting in on 
> another lead, such as the power leads, data connection or audio 
> connections. I'm inclined to believe it is all from within the receiver 
> and no outside signals are involved. With a system as complex as the 
> Orion, it is possible that to duplicate it on another Orion almost every 
> single setting would have to be identical. Maybe the fellow who cannot 
> hear it on his Orion has some setting completely different from you, 
> resulting in one of the necessary component oscillators or clocks not 
> being on the same frequency as in your Orion. What about the local 
> oscillator in the auxiliary receiver? Maybe he habitually leaves his on 
> a WWV frequency and you habitually leave yours on some other frequency.
> > I am going to try turning off other electrical gear near the transceiver 
> > (computer, principally) and see if that makes a difference.
> >
> >   
> Good idea. And in addition to turning things off, disconnect as much 
> stuff from the rig as possible.
> 
> DE N6KB
> 
> 
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