Re: Topband: Sanity Check on K9AY Loop Sensitivity
Hi Pete, I also had problems with broadcast stations at my 4 EL bidirectional (330°/150°) broadside K9AY arrays 84 meters apart uses three 0° hybrid combiners. The problem was solved by a Hi-Z amplifiers with operational IO AD8855ANZ according to Steve VE6NZ in each of the K9AY Loop. I don't use any impedance transformers anymore. The amplifiers are connected directly to the K9AY antenna loops through a small capacitor. Karel OK1CF -Původní zpráva- Od: Topband za uživatele Pete Smith N4ZR Odesláno: pondělí 12. prosince 2022 15:59 Komu: topband reflector Předmět: Topband: Sanity Check on K9AY Loop Sensitivity I just deployed my K9AY loop (yes, I know I'm late). Anyhow, while it shows substantial directivity on broadcast stations, I was surprise by how much the K9AY loop's sensitivity suffers compared to my inverted L. Listening to a broadcast station with the K9AY on 1500 KHz, the station is S6-7 in the right direction and S3 in the reverse. and S9 +10 on the inverted L. There's also something haywire in the K9AY's preamp, which *reduces* signal by a couple of S-Units. Could be I need to replace the transistor? -- 73, Pete N4ZR One of the RBN team _ Searchable Archives: <http://www.contesting.com/_topband> http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Skirted vertical antennas for MF broadcast
I have been using a similar antenna for 160m for several years. I described it on my QRZ.com website. Karel OK1CF -Original Message- From: Topband On Behalf Of Joe Sent: Thursday, April 7, 2022 5:44 AM To: topband@contesting.com Subject: Re: Topband: Skirted vertical antennas for MF broadcast That's a very interesting antenna. I wish it had a spec of freq in the drawing so it could be scaled to 160 or 80 meters. Joe WB9SBD On 4/6/2022 7:00 PM, Radio KH6O wrote: > I'm surprised that the broadcast industry is just discoving this > topic. My library of decades-old antenna handbooks covers this quite well: > > https://www.radioworld.com/show-news/nab-show/why-well-dressed-towers- > may-wear-flared-skirts?utm_source=SmartBrief_medium=email_camp > aign=33CCA446-266B-43B6-8A18-118AF7B202FA_content=E5518F4E-90C4-40 > BF-B705-81A7DB3E8C14_term=5e35c2b9-3044-4235-9961-04d879406e09 > > 73, > Jeff KH6O > _ > Searchable Archives:http://www.contesting.com/_topband - Topband > Reflector > _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: PSK31 etc
Hi. I am strongly against your recommendations. 1836 kHz is the center of QRP activity! Use only IARU approved frequencies for digimodes! iaru-r1.org/wp-content/uploads/2019/08/hf_r1_bandplan.pdf Karel OK1CF CRC HF Manager -Původní zpráva- Od: Topband za uživatele Jim Brown Odesláno: pondělí 21. února 2022 22:35 Komu: topband@contesting.com Předmět: Re: Topband: PSK31 etc > What are recommended frequencies for PSK31 and FT8 (and others if > applicable) on 160m? I don't know of digital activity on 160M other than WSJT modes. It's mostly FT8 and WSPR, very occasionally FST4 and FT4. Default frequencies are in WSJT-X. Study the manual to activate them. 73, Jim K9YC _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Topband: W6WIN/7
Hi, does anyone know the skimmer QTH of W6WIN / 7? He sometimes spots me, but I don't know where he is? Many thanks. 73 Karel OKCF _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Topband: Stew Perry audio files
Hi. My Stew Perry 5 minutes MP3 audio files are saved at: https://ulozto.cz/tamhle/sWl7RYQ4pzWA/name/Nahrano-28-12-2020-v-19-23-23 Time of files UTC+1 Hour. 73 es HNY Karel OK1CF _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Looking for a 2n5109
Hi, There is an equivalent type of 2N5109 available at many sellers. NTE278 with same parameters. Karel OK1CF -Původní zpráva- Od: Topband za uživatele Richard (Rick) Karlquist Odesláno: čtvrtek 22. října 2020 21:44 Komu: Edward stallman ; topband@contesting.com Předmět: Re: Topband: Looking for a 2n5109 On 10/22/2020 9:22 AM, Edward stallman wrote: > I remember about a year ago a discussion not to buy the 2n5109 > transistors from E-Bay sellers . Some searching shows the 2n5109 has > been discontinued for many years . So is anyone that's been saving one > for many years willing to part with it ? I'm using it in a W7IUV pre-amp . > > Thanks Ed N5DG > Mouser has them in and out of stock. I ordered some 6 months ago, and they came in about a month later. Rick N6RK _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
