Welcome to new 160m band blog
This blog is the replacement of the my preview Topband blog here http://topband.blog.cz/ because of an aggressive advertising and flash banners inserted by the blog provider. For older posts access You can visit the old blog link which will exist still... but it will not be updated anymore.
Effective from 1st Jan 2017 please paper QSL via OM-bureau only.
Tuesday, October 18, 2016
I noticed that the terminating resistor value and material/type for good working Beverage receiving antenna for low bands DX-ing is never ending story and object of many discussions and internet threads so I decided to post over here few useful information in order to help those guys who do not want to spend annoying time to browse and investigate about this topic.
Why Composition Types?
The important is to look for carbon composition / ceramic composition resistors at 2W power rating at least. The Ohmite has their OY series / 2W for example.
Mouser 10 pack for $16.20
Farnell / Newark:
The resistors datasheet:
It is highly recommended to put a 75V 10 kA GDT in parrallel with the resistor at the end of the beverage antenna. The 10 pack at $1.41 and it will last a long time in the field.
More info links:
Hope it helps,
73 - Petr, OK1RP
Friday, February 26, 2016
as I received several emails with questions about the preamplifier which I am using for my LB external RX antennas like W2PM MiniDiamond loop, EWE loop, K9FD loop etc. I decided to post over here some informations about this unit.
The basic design is inspired with his permission by Larry, W7IUV. The complete article about his preamplifier was published on his web here:
The size, shape and terminals has been choosen according to my alu-case available...
The most important part of this design in my opinion is the transformer and working state of the transistor 2N5109. You must follow the winding rules as same as core material for transformer and finally you must use prescribed current of the transistor in order to reach expected performances.
If you are interested in the suppliers for Amidon, Fair-Rite cores or even you have problem with finding the 2N5109 there are some links which I used...
The heatsink on the transistor is a must. Do not change the resistors in order to decreasing the collector current of the transistor! These conditions are key parameters for high IMD immunity / OIP3 performance...
Testing the assembled preamplifier is straight forward. Before applying power double check your work. The most common problems are solder shorts and resistors inserted in the wrong place. Once you are satisfied you have correctly assembled the circuit place 50 Ohms terminations on the input and output.
Hope it helps.
73 - Petr, OK1RP
Monday, February 1, 2016
We really tried to catch our kangaroos friends in this event too. I am really sorry but no way to work VKs in this CQ160...
I was both evenings on time around 1820-1825kHz. Our VK Beverage sounded also quite well with no usual high noise level.
I really looked for famous Ron, VK3IO and both Steves, VK6VZ and VK6IR. Unfortunately the band was extremely crowded and I am pretty sure that even although we used narrow filters (only IC7600...) our receiver/AGC has been knocked down from so strong nearby signals so I was very deaf even with 330m long Bev to VK.
Well the only single spot I realized on cluster with VK6IR on 1833 on Sat evening but I did not hear Steve unfortunately on this frequency. No VKs readable at our QTH even with Bev to 90deg at all.
As Ron, VK3IO already mentioned on Topband Reflector - http://www.contesting.com/_topband "This year's contest was almost a total wipe out as far as VK was concerned, due to summer storms on the east coast and the usual topical storms up north and a cyclone off the west coast made it impossible."
Never mind, it is just hobby. I was really happy to work XE2X, YV1KK, HK1X, BA1CW, B1Z. Many thanks for your time and effort and hope to work you soon outside the contest on quiet band.
73 - Petr, OK1RP
Thursday, January 7, 2016
thanks to Jeff, VY2ZM(K1ZM) we are able to go back into the TB history and read the Stew's (W1BB) 160m BULLETINS!
As Jeff posted on the TB reflector...
"Most of STEW's 160m BULLETINS from 1930 to 1965 are on my website in the W1BB section - these chronicle the history of the early TRANSATLANTIC TESTS and were sent to me courtesy of PY1RO. Stew used to send these out to anyone who wanted to be on his distribution list - GRATIS too - just another measure of the man....
They are from his mimeo machine and some of them are a bit hard to read - but well worth a looksee.
The site is K1ZM.com/w1bb
73 JEFF VY2ZM"
I would like to thank Jeff, VY2ZM for his job and sharing these documents. It is great chance to study the history of the band, operation and other details from 1930 up to now!
73 - Petr, OK1RP
Tuesday, December 29, 2015
Friday, October 16, 2015
The PreStew topband distance challenge will take place from
1500Z 17 Oct until
1500Z 18 Oct.
This is a CW only event that takes place on 160 meters. The band has been coming alive with good solid openings during darkness.
The "distance" aspect of this is a unique rule where you get more QSO points for working stations that are further away.
For example - a station in Oregon would get 2 or 3 points for working California - 8 or 9 points for working the East Coast - and 15 or 16 points for working Japan. VK6 is worth 30 points!! Furthermore - if you - or the other station - are running either low power - or QRP power - the QSO is worth more for BOTH stations involved in the QSO.
This unique scoring method encourages and rewards working those weaker signals - and benefits those who have put a lot of effort into hearing well.
This PreStew is a warmup for the "big" Stew that takes place on December 27th.
Full rules and results of previous events can be found at http://www.kkn.net/stew/.
Hope to hear you on the band tomorrow night.
Topband Reflector Archives - http://www.contesting.com/_topband
73 - Petr, OK1RP
Thursday, September 17, 2015
as it is very important on 160m band for DXers I am re-posting here the article from Don, K4KYV regarding the proposed new MF and LF allocations in FCC Docket 15-99 even although it is a bit late...
Re Docket 15-99
While most attention so far has focussed on the proposed new MF and LF allocations, there is also the issue of fish net beacons on 160m. The initial comment deadline is past due, but REPLY COMMENTS ARE STILL OPEN THROUGH THE 30th of SEPTEMBER. We can reply to the ARRL comments; they pretty much have the issue identified and defined spot on, except for a suggestion that fish net beacons on 1900-2000 kHz be moved to the "lightly used" portion of the Radiolocation frequencies between the broadcast band and 160m ham band, specifically 1750-1800 kHz. From what I hear on my receiver at this location, THE ENTIRE SEGMENT OF FREQUENCIES between 1705 kHz and 1800 kHz is lightly used. I rarely ever hear a signal of any kind in that segment, which was once packed full of now-discontinued radiolocation beacons. I would strongly urge everyone to submit a reply comment explaining why you support the ARRL position, with a further suggestion that the entire band of Radiolocation frequencies between 1705 and 1800 kHz be considered for re-accommodating beacons presently on 1900-2000.
I am not familiar with the beacon transmitters except for a few online ads for the products, but I suspect it would be very easy to move the transmit frequency, requiring only re-setting a synthesised master oscillator and tweaking the antenna tuning network. A technician could probably complete the task in less than 10 minutes.
The beacons would suffer far less interference operating in the now-vacant Radiolocation spectrum, than in the heavily used amateur band. Even though they operate at low transmitting power, amateurs, particularly those living in coastal areas, frequently complain of interference. Likewise, signals from high power amateur transmitters are undoubtedly capable of causing harmful interference to the beacons.
When the FCC released the Report & Order upgrading amateur status to primary, it wasn't immediately clear that this included a new docket proposal (15-99) with a subsequent comment deadline. It is unusual for the FCC to combine a R&O for one proceeding with a new Notice of Proposed Rulemaking all in the same release, so this did not come to the attention of most amateurs until a recent news item appeared on the ARRL website.
73, Don k4kyv
Some useful links:
Here, you see a list of links to recent comments, plus a link to the text of the original FCC Release in the right-hand pane. If you wish to submit a (reply) comment, click on "Submit a Filing in 15-99", which is located at the top of the page just above the main heading.
Here is the entire FCC Docket, which is very lengthy. The pertinent section addressing the 1900-2000 kHz issue begins with paragraph 30.
Here are the ARRL's submitted comments. The 160m issue is addressed in Section II, beginning on page 4 and running through page 11.
73 - Petr, OK1RP