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References: [ +from:N4IS@COMCAST.NET: 219 ]

Total 219 documents matching your query.

121. Re: Topband: Comments on High Performance RX Antennas for a Small Lot (Webinar) (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 4 Mar 2016 08:57:48 -0500
Hi Rick As I told in the webinar it is a measured practical result, not a math calculation.. I have a DDC SRD and several receiving antennas in a very clean environment, only one TX antenna detuned,
/archives//html/Topband/2016-03/msg00054.html (9,644 bytes)

122. Re: Topband: RDF in the real-world (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 4 Mar 2016 12:31:18 -0500
Hi Carl Yes, the concept is assuming equal density noise spread uniform. However there air point everybody wants to hide. Vertical polarized antennas based on phasing elements does change directivity
/archives//html/Topband/2016-03/msg00061.html (9,899 bytes)

123. Re: Topband: Comments on High Performance RX Antennas for a Small Lot (Webinar) (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 4 Mar 2016 13:11:04 -0500
Hi Frank I agree with you. I'm near Fort Lauderdale in a city lot, directivity from my Vertical WF did help me a lot on 160, some rare DX like 4W6 was possible only direct and using the vertical WF.
/archives//html/Topband/2016-03/msg00067.html (13,210 bytes)

124. Re: Topband: : RDF in the real-world (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 4 Mar 2016 13:13:40 -0500
Hi Bruce, I am missing something here, can you elaborate on that statement? 73 JC N4IS _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2016-03/msg00068.html (7,121 bytes)

125. Topband: UN-REAL AND THE REAL WORLD 2016 FOR HAM RADIO (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Tue, 8 Mar 2016 05:43:02 -0500
Hi Folks I have been working to improve my RX systems for several years. I ?ve got good results using good practice on grounding shielding and detuning my TX antennas. I heard this several times from
/archives//html/Topband/2016-03/msg00103.html (9,035 bytes)

126. Topband: FW: UN-REAL AND THE REAL WORLD 2016 FOR HAM RADIO (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Tue, 8 Mar 2016 10:04:12 -0500
Hi Don I think my preamplifier does not agree much with that. My PC LCD monitor screen was causing several noises I could hear on 160m and actually I could see them on the SDR waterfall. When I put t
/archives//html/Topband/2016-03/msg00105.html (7,776 bytes)

127. Re: Topband: Post contest season: TX antenna vs RX antenna cros-stalk. What do you do? (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Thu, 24 Mar 2016 08:14:35 -0400
input during RX mode' ?<< There are several reasons why it is necessary to detune the TX antenna during RX, however disconnecting the center of the TX coax during RX on 160m is a MUST. If you don't
/archives//html/Topband/2016-03/msg00210.html (10,648 bytes)

128. Topband: #300 Small Lot DXCC (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Mon, 11 Apr 2016 07:33:24 -0400
Hi Top band lovers Doug NX4D just reach a milestone on topband DX. #300 worked countries on 160m from 1/5 acre lot. Doug wants to motivate people about what is possible with dedication and good pract
/archives//html/Topband/2016-04/msg00076.html (6,994 bytes)

129. Re: Topband: VK0EK confirmation (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Mon, 18 Apr 2016 14:16:40 -0400
My two cents Few weeks ago I requested VK0EK QSL card using Online QSL Request System (OQRS), with a modest donation. I checked LOTW and my confirmation was not there, I forgot to upload my log updat
/archives//html/Topband/2016-04/msg00110.html (8,193 bytes)

130. Re: Topband: The band sans noise (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Wed, 20 Apr 2016 10:35:43 -0400
Hi Guys The issue with noise is growing fast and the only way to improve signal to noise ratio is more directivity and when possible filter the man made noise with a horizontal loop. My last presenta
/archives//html/Topband/2016-04/msg00131.html (8,298 bytes)

131. Re: Topband: The band sans noise (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Wed, 20 Apr 2016 10:40:43 -0400
Correct link for the pdf file, It has more slides not covered during the time limited webinar http://wwrof.org/wp-content/uploads/2016/03/WWROF-WEBNAIR-RX-Antennas-for-aSmall-Lot-.pdf JC Hi Guys The
/archives//html/Topband/2016-04/msg00132.html (8,882 bytes)

132. Re: Topband: The band sans noise (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 22 Apr 2016 12:26:52 -0400
SORRY am not getting into this PR.. PIXEL loop is a low RDF and LOW performance receiving antenna, it is really snake oil. I'm out of this discussion. Regards JC In tests, the Pixel magnetic loop pro
/archives//html/Topband/2016-04/msg00138.html (7,794 bytes)

133. Topband: WF300 vertical & horizontal noise and & magnetic loop (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Wed, 11 May 2016 10:57:16 -0400
Hi folks The Waller Flag is a high performance antenna, however the station should be well grounded. Using toroid chokes it is possible to know down common mode noise. N8PR is working hard to clean a
/archives//html/Topband/2016-05/msg00026.html (7,507 bytes)

134. Re: Topband: low band propagation at solar min (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Sun, 5 Jun 2016 21:41:03 -0400
"I assumed that this was normal propagation for 160 but I have never observed anything consistently as good as it was in the 1980's. Anyone else found this to be true? What was different about the so
/archives//html/Topband/2016-06/msg00044.html (8,730 bytes)

135. Re: Topband: best headphones for cw (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 17 Jun 2016 19:43:00 -0400
Some headphone can isolate noise very well. I like the Sennheiser HD280 , it provide 36db isolation, but the best one I have is the MC5 from Etymotic ear plug that can reach 42 db isolation. 73' JC N
/archives//html/Topband/2016-06/msg00083.html (7,299 bytes)

136. Re: Topband: Modeling Transmit Antenna Affect on Rx Antenna Performance? (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 30 Sep 2016 15:20:30 -0400
My TX antenna is 60ft from my vertical WF and my horizontal WF is at the top of my TX antenna. I am using a Folded Unipole configuration, it is a skirt with 3 wires forming a cage. The skirt detune t
/archives//html/Topband/2016-09/msg00149.html (8,041 bytes)

137. Re: Topband: Modeling Transmit Antenna Affect on Rx Antenna Performance? (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 30 Sep 2016 17:35:33 -0400
Your feedline is about 350 feet. That is (with RG213 -velocity 0,66-) close to 1 wavelength. With 1 wavelength feedline, the TX antenna is floating when the feedline is open in the shack. I'm sorry t
/archives//html/Topband/2016-09/msg00154.html (8,286 bytes)

138. Re: Topband: Modeling Transmit Antenna Affect on Rx Antenna Performance? (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Fri, 30 Sep 2016 21:13:29 -0400
Your feedline is about 350 feet. That is (with RG213 -velocity 0,66-) close to 1 wavelength. With 1 wavelength feedline, the TX antenna is floating when the feedline is open in the shack. Just wrong
/archives//html/Topband/2016-09/msg00155.html (7,964 bytes)

139. Re: Topband: Hi Gain Preamps, Noise Figure Comparison (KD9SV 994 x5, W1FB, W7IUV preamps) (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Tue, 8 Nov 2016 19:24:25 -0500
Hi Don Measuring noise figure below 1 db is a very complicated work. First you need to remove all common mode noise, your noise floor should be better than -135 dBm at least with a 40 db preamp conne
/archives//html/Topband/2016-11/msg00046.html (7,752 bytes)

140. Topband: Power line noise and Contest conditions during CQWW (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Thu, 1 Dec 2016 00:15:11 -0500
Hi topband lovers I would like to share with the group my experience living in a city lot and working on 160m. Florida Power Light used to fix power line noise in few week, but one noise just started
/archives//html/Topband/2016-12/msg00000.html (6,557 bytes)


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