Here, 160m vertical had noise floor this AM of -103 dbm, with beverages (720 ft), about -118 dbm, measured with Flex 6300. No need for a preamp.BTW, 160 was poor this morning. Jim W8ZR
> -----Original Message----- > From: Topband [mailto:[email protected]] On Behalf Of C Allen > Baker via > Topband > Sent: Saturday, January 09, 2016 06:29 AM > To: [email protected]; [email protected] > Subject: Re: Topband: Received Signal Strengths > > > > On Saturday, January 9, 2016 6:52 AM, Ed Sawyer <[email protected]> > wrote: > > > The 5NN discussion brought up an interesting subject to me. Signal > strengths reported on 75M SSB are funny to listen too as people seem to be > in a "mines bigger than yours" competition on how many dB above S9 a signal > is. Meanwhile their noise floor is probably S7 or more - what's the point? > > > > Here at N1UR, on 160, I have switchable T verticals (EU direction and Omni). > I NEVER listen on them. Nighttime noise floor is typically S5 - 7 in the > winter on them with static crashes well over S9 if there is storming in the > east half of the US (for CW). I have done some signal strength comparisons > with EU stations and Carib stations vs my beverages. > > > > Typically, on 160M, I leave the preamp off for my beverages. The received > noise floor for my N/S beverage (on CW) is usually S2 - 3 and for my phased > EU beverages is S0 to S1. I have found the signal strengths of the received > stations to be 1 to 2 S units down on the beverage and equal or stronger on > the beverage if I turn the preamp on - with usually a rise in the noise > floor by a 1 or 2 S units. Interestingly, on 80M CW, I usually use the > beverage preamp. The signal often comes up 3 - 4 S units and the noise only > 1 to 2 S units. I often drop in some attenuation to make the noise floor > "just" go away. > > > > What do others see as the difference in transmit antenna vs low noise > antenna signal strengths? > > > > N1UR > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > > > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
