04 July 2018

SMA/N and SMA/UHF + SMA/BNC jumpers


The measuring SMA/N and SMA/UHF + SMA/BNC jumpers arrived. I will measure them on VNA in lab before any assessment or judgment. I ordered several versions for lab test with N, UHF, BNC using the RG316 PTFE coaxial cable. As I said several times I hate Chinese craps but these looks well for the first view...

Product NameCable Connector
TypeN Type Female to SMA Male
Cable TypeRG316 Coaxial Cable
Cable Length22.5cm/9"
Main MaterialMetal, PTFE
Main ColorBlack.Gold Tone
Package1 x N Type to SMA Cable Connector Cable

I will make the lab report and short review of the jumpers when lab time will be available.

73 - Petr, OK1RP

A1 Club - 20 years Anniversary QSL cards

A1 CLUB has been established in October 1998 by 11 charter members who gathered under the same slogan "Let's gather CW lovers, enjoy CW and attract people to CW"

After 20 years, A1 CLUB has grown with more than 3000 members from 50 countries worldwide as a free and open community which anyone who has interest in CW can join.

A1 CLUB has been and will continue to be a supporter of "CW" as the only one digital mode which can be code and decode by human.CW4EVER!

My new 20 years A1 Club Anniversary QSL cards are ready to go...

QSL policy: Effective from 1st Jan 2017 please paper QSL via OM-bureau only!(S.A.R.A. P.O.BOX 14, 900 31 STUPAVA, Slovakia)

73 - Petr, OK1RP

03 July 2018

K144XV transverter module "must have" modification by Steve, DH1DM

If you are not so satisfied with the K144XV transverter module installed in your Elecraft K3 transceiver then you should read it...

Thanks to Steve, DH1DM you can make "must have" modification which could solve your issues or it can help you at least...

After re-tuning has been completed these modifications result in an increased TX stability and no oscillations can be observed anymore at any power/frequency.

Component alignment has also been found less critical after modification. Output power has been measured at 9.5W.


73 - Petr, OK1RP

Sea of Peace Award 2018 (SOP) started!

Sea of Peace Award 2018 (SOP) started!
If you want to get beautiful pennon or following your last year achievement you would like to continue to get sticker then you should turn on your radio and pay attention to the stations from the required countries during the July 2018...

This certificate in form of a silk pennon will be awarded for QSOs with the Baltic neighbouring states and regions in July. Annual stickers can be acquired for repeated fulfilment of the rules during the subsequent years.

Beyond coming SOP-owners will receive special recognitions after 5-and 10-times achievements of the pennon and stickers.

This popular certificate was awarded by the amateur radio organisation of the former GDR in 1958. And has been continuing by the DARC district Mecklenburg-West Pomerania since 1991.

In 2018 we celebrated 60 years of SOP with a special call signs DL60SOP.

Supplement for 2018: Foreign stations with the suffix "SOP" (e.g., OZ4SOP, SJ1SOP...) count as a joker for a not achieved area.

01 June 2018

Are you a True Blue DXer?

If watching a computer make contacts for you is not your idea of DX...

If you are decoding by human ears and brain power...

...then you are a True Blue DXer!


Digital modes, particularly FT8, have literally taken Ham Radio by storm. We at True Blue DXers Club (TBDXC) applaud technical innovation, and we are glad that so many people have found a new avenue for their amateur radio passion. We wish digital operators every success and lots of enjoyment.



We are somehow saddened that such explosion of activity has come to the detriment of traditional, person-to-person modes of communication. Experience tells us that, even with poor propagation and rising noise, both high-level, competitive DX activity and leisurely rag-chewing on CW and SSB are possible and highly enjoyable, even for stations with modest means. Yet, the CW and SSB sub-bands are often nearly deserted, whilst the FT8 "watering holes" literally explode with signals which would be perfectly copyable by ear.


DXing means pushing the limits - one's own and the station's. DXing requires skills, knowledge, determination, patience, endurance, investment - it's a constant pursuit of excellence, one that, for some, has lasted a lifetime. It is that spirit that makes a DXer, and not the results he or she has achieved. The Old Timer waiting for the last DXCC country to complete the #1 Honor Roll and the newcomer struggling to push beyond 100 from a noisy city lot belong together - they are True Blue DXers.


There is more to DXing that competing in furious pileups, waiting for that elusive 6m opening or spending sleepless nights trying to dig a signal out of the noise on Top Band. Simply communicating with a fellow ham thousands of miles away remains, for most of us, an exquisite pleasure. True Blue DXers love the sound of DX - the auroral flutter on Polar paths, the slow fading over the oceans, the slap-back delay on multi-paths. They like to hear that there is a fellow ham behind the key or the microphone, in a faraway place.


Then, why not joining the Club? Apart from your personal commitment to pursuing and promoting more traditional forms of DX activity, there are no requirements. And, there are no membership fees. Belonging to the True Blue DXers Club is essentially a proud statement: this is what we do, this is what we are.

TBDXC link: http://www.tbdxc.net

73 - Petr, OK1RP


24 May 2018

The 17th A1Club QSO Party 2018

A1 Club is pleased to announce the              A1 Club QSO Party, which is open to all radio amateurs world-wide and which
aims to encourage the use of and excellence in Morse code.                                            Event: The A1 Club QSO Party.
This is an operating event, not a contest.

Date & time:
From 2018-4-30 15:00Z to 2018-5-31 15:00Z, for a month

Object:To try communication by the international Morse Codes on all amateur bands.

Exchange: Normal QSO style. --> Ragchew if possible
a QSO which includes at least an exchange of information other than RST report.>

Frequencies: CW portions of the amateur bands assigned in each country where you operate.

Mode: CW using the internatinal Morse code

Internet Tool: Following internet sites are recommended to find participants.

A1 CLUB Facebook Group

Activity Report: Send following information from the [ENTRY FORM]
(1) Your Callsign, (2) Your name, (3) Comments, (4) Photos (if any)
< The entry form will be available from 1st May to 15th June>

Certificate: No awards will be given as this is not a contest.
An entry certificate in electrical format will be provided on request (see entry form)

RESULTS(in Japanese)         A1 CLUB Top

11 September 2017

Looking for clean SS HF PA w/QSK - part 5 (Elecraft)

Hi all,

"Everything goes very well with the FCC approval and there will be the KPA1500 linear amplifier official announcement soon on Elecraft list and Elecraft pages as informed Wayne, N6KR few weeks ago....

Short time after I noticed the note that FCC approval arrived and KPA1500 is ready for orders! Official announcement then appeared on the Elecraft pages as same as on the Elecraft mailing list quickly.

So new 1,5kW Solid State HF-6m PA w/QSK was born in Elecraft and it comes to be available worldwide. soon

As you know my preview parts talked about:
ACOM 1200S
LINEAR Amp Gemini HF-1K

Azden AZR-1000

The Elecraft KPA1500 is 1500 watt PEP output, MF, HF and 6 Meter linear amplifier. It utilizes the latest LDMOS transistor technology to provide a robust desktop amplifier in a compact cabinet, with an included companion power supply that can be located off your desktop.

The Elecraft KPA1500 was designed with the serious operator in mind. Its no-nonsense front panel shows all important parameters at a glance, with a high-contrast 32-character LCD and fast, bright LED bar graphs. Band switching is instantaneous, via control inputs or RF sensing. Protection and monitoring circuitry is extensive and foolproof, letting you focus on the job at hand — breaking pileups and overcoming the most difficult operating conditions. And it wouldn’t be an Elecraft amp without robust PIN-diode T/R switching. Like the KPA500, the KPA1500 offers fast QSK without a noisy relay!

So it looks like there is "thanks god" second 1kW+ SSPA with silent, fast and well working QSK system on the market...

The amplifier’s rugged internal ATU can handle full power with load SWR up to 3:1, while a wider matching range is allowed at lower power levels, including up to 10:1 in standby mode.

Compare to their preview products initially this KPA1500 will be available in Factory-built form only.

According to Elecraft announcement an introductory pricing is $5,995 U.S. This includes the 1500-watt linear amp. internal tuner and separate switching power supply.

Compare it to other amplifiers on the market and you will notice that it is not so bad.

The most important KPA1500 features:

- 1500W RF output
- Very compact design
- Fast, silent PIN diode T/R switching system
- Built-in Antenna Tuner with dual antenna jacks
- Compatible with nearly any transceiver
- 160-6 meters

Freq. (MHz)Pin (W)Pout (W)Gain (dB)

New KPA1500 solid-state amplifier won’t take over your entire desktop: it’s just 4,5 x 13,5 x 11,5” (HWD; 11,5 x 34 x 29 cm). The lightweight companion power supply can be placed on the floor or in any other convenient location...

According to the user guide the duty cycle at 1500W out is 10mins key down / 5mins standby.

Interesting functions:

- Automatic Band Switching mode
- Manual Band Switching mode
- Coordinated K3 and KPA1500 Band Switching mode
- Remote PC control using RJ-45 or USB
- Power meter internal calibration procedure (PWR ADJ)
- Internal automatic band selection w/master-priority to protect KPA1500
- Icom, Yaesu and BCD codes available to incorporating w/other radios

Thanks to Martin, OK1RR and OKDXF you can find more details here(CZ) or as follows:
KPA1500 User Manual.pdf
KPA1500 Pics outside.pdf
KPA1500 Pics inside.pdf
KPA1500 EMC test protocol.pdf
KPA1500 EMC test pics.pdf
KPA1500 Spectrum purity.pdf

If you remember the LinearAmp Gemini HF-1K
implemented the fully solid state QSK switching. No relays. Diode switched system turned of hard by a 300V rail.

So there is another competitor on the market with robust PIN-diode T/R switching and even more power up to 1,5kW.

KPA1500 Shipments are planned to start Mid to Late October against the backlog.

KPA1500 Flyer.pdf
KPA1500 FAQ.pdf

Ordering info

73 - Petr, OK1RP
"auf die Dauer hilft nur Power" (Erich, HB9FIH)