Wayne, Not enough information!!
Any preamplifiers? Any trace of additional modulation? A mixing of BC signals will have at least a faint second modulation, **and** a mixing of BC signals or a harmonic distortion spurious always falls on a "ten" in the USA/Canada. It cannot fall on a "five" external to the receiver when it is an exclusive AM BCB product. My Yaesu's are subject to a local AM BC station from an image, and that image falls on a "5". Fortunately it is out-of-band. Unless you have an external signal outside the AM band that is on a difference ending in five kHz, or unless the AM transmitter has a spurious in some sort of mixing or frequency synthesis scheme, it is nearly certain to be a receiver problem. An attenuation test will only show nonlinearity in the receiver, and it does not sound like that is the problem based on the image being on a "5". 73 Tom ----- Original Message ----- From: "Wayne Willenberg" <[email protected]> To: <[email protected]> Sent: Monday, August 13, 2012 10:36 AM Subject: Topband: Image on 160M > Hello, > > As I am slowing working my way into 160M, I have been listening to my > new reversible 480ft Beverage antenna. > > I live in a rural area. However, there is one small town about 5 miles > from me. The only really strong BC station near me is a 500W (day time) > (not 5,000W) station at 1.490MHz. It is about 7 miles away. As I tuned > through the 160M band I found an image of that station at 1.915MHz. With > the Beverage, in the *NE position* the image reads -117dBm and if I switch > to AM mode, I can understand the broadcast. I don't see any other signals > on the 160M band. > > Is it normal to find images like this? > > B/T/W, when I switch to the *SW position* (the direction of the > transmitter > and the small town), the signal power rises to -110dBm, but the noise > floor > also goes up. Is it reasonable to assume the additional noise is probably > coming from the small town? > > Thanks to everyone who has helped me slowly build a 160M station. > > 73, Wayne KK6BT > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
