roWaves

The IMD3 test (Part.1) results (160-6m) for JUMA PA1000+ 1kW PA are presented below. The tests were performed with following test setup:
- Spinner 1kW Dummy Load BN 537761 D.C. to 860MHz
- Werlatone C5425 Dual Directional Coupler (1200W/10-175MHz/50dB)
- 2 x HP8656 Signal Generators for better signal purity (signals are spaced 2KHz apart, at the interest freq. domain)
- Minicircuits ZX10-2-12-S+ combiner (typ. 3dB transmission loss)
- 7th order LPF high-quality filters for extra filtering on signal generators output and to remove any high freq. spurious or possible harmonics
- SSA3021X Plus Spectrum Analyzer with 10dB 10W ATT at input

The testing power levels were 400 to 900W, dependent on the band and gain. Results:
160m IMD 1.9MHz -38.3dBc
80m IMD 3.65MHz -38.3dBc @ 450W
40m IMD 7.1MHz -38.4dBc @ 600W
30m IMD 10.1MHz -38.6dBc @ 450W
20m IMD 14.175MHz -42.2dBc @ 850W
17m IMD 18.1MHz -37.9dBc @ 700W
15m IMD 21.22MHz -40.5dBc @ 450W
12m IMD 24.94MHz -37dBc @ 400W
10m IMD 28.85MHz -38.5dBc @ 400W
6m IMD 51MHz -28.9dBc @ 350W

Update1: For maximum power levels we are building a setup with 2 x ULTA-10 Linear Amplifiers and high-power combiner (~30W) to drive the PA1000+ up to 60dBm.

Update2: *IMD3 formula:
IMD3 = Pout (dBm) - P3rd order intermod. product (IM3)
(add 6dB in each of the measurements below, for real IMD3 result)*

Today we received the HP8656/7 signal generators and we were able to perform the 2 x tone IMD test for ULTA-10 Linear Amplifier (1-200MHz, 25dB typ. gain, ~10W). Our previous signal generator was not capable for this test (GWInstek MFG-2220HM). Test setup:
1) 50db 1200W 10-175MHz directional coupler Werlatone C5425
2) dummy load Spinner BN 537761
3) 40dB ATT at spectrum analyzer input
4) 2 x 13dBm inputs from SG (2KHz spaced) combined with Minicircuits ZX10-2-12-S+ (6dB)
5) 20m 7th order LPF after combiner
6) ULTA-10 biased at 2.6Adc / 50Vdc

Ref. Level Offset at SA is 90dB (40dB ATT + 50dB coupler).

Perfect coaxial stripping for the output transformer at ART2K0FE side, on PA1000+, 1kW, HF+6m PA.

ULTA-10 is a high linearity PA driver with MRFE6VP100H (~10W / 25dB gain) for testing and validating the harmonics behavior and IMD performance of PA1000+. The first results are below. Features:

- suppression for 2f is better than 60dbc
- suppression for 3f is better than 50...55dBc
- 1...200MHz
- typ. gain 25dB
- 50Vdc at 2.5Adc bias
- class A operation
- temperature compensated bias circuitry
- optimized for signal purity not for efficiency (it draws about 125..130W without input drive)

SA plots with performance from 10-50MHz (lower limit due to Werlatone C5425 50dB coupler, 10-175MHz) are below. 160-40m plots will be performed with home-brewed 50dB coupler/ RF sampler, next days. General observations for the test set-up:
- phase noise of the signal generator is visible in the plots (further investigation required)
- SA is attenuated at its input with 30dB ATT to avoid over-drive
- external FAN cooling for the ULTA-10 is used
- ref. level offset to 80db (50db coupling factor from coupler + 30dB at SA input)

This step being achieved the next step will be to test the IMD performance of the PA1000+.

A new lot of SOTA High Efficiency Matching Transformer for summer QRP activities, in stock now. 64:1, 20W, QRP, with wire length specification on it, for 20m operation:
Grab yours here:
https://rowaves.com/rft18-20-20w-bal-un-transformer/

We are very close to the start of deliveries for the PA1000+ 1kW HF+6m amplifiers to the customers, for the pending orders. Power delivery capability testing, SWR testing, all protections tested and temperature profile / behavior tested. Power delivery values have been tested/recorded with preliminary test setup:
- spectrum analyzer Siglent SSA3021X Plus, with external dual directional coupler at measuring port
- Werlatone C5425 Dual Directional Coupler (1200W, 50dB coupling) for kW to 10dBm SA input
- Spinner 1kW BN537761 dummy load
Ongoing: measurements specification file will be published soon.

Following tests: IMD3, P1db and harmonics distortion with reference drive 10W amplifier. Keep an eye on our website product page and secure your pre-order for September 2024 deliveries. Pre-order here:
https://rowaves.com/juma-pa1000-1kw-power-amplifier/

First laboratory tests for PA1000+, on going. Updates soon 👍🙏

Revista RADIO (format printat) este disponibila incepand de luna aceasta la un pret de 39lei cu tot cu transport prin Posta Romana, plata cu card pe site. Am introdus un transport mai ieftin pentru a incuraja clientii interesati de publicatie. Evident am pastrat si livrarea cu curier, pentru cei ce doresc ca revista sa soseasca putin mai repede.

Link revista:
https://rowaves.com/revista-radio-numar-cu-numar-print/

Some exciting news about our product portfolio, very soon. Thanks R&S Romania for the help.

Full PA1000+ and PA-100D | 1kW and 100W Linear Power Amplifiers production.
https://rowaves.com/juma-pa1000-1kw-power-amplifier/

Spinner 1kW D.C. to 860MHz BN 537761
dummy load arrived to our lab from Greece, yesterday. After some basic clean-up and connector re-silvering the unit is prepared for usage. 7/16" Radiall adapters to N-male (and female) were acquired also. At a first fast measurement it looks great. VSWR

Labeling and boxing for newest devices and tools. Some sort of order it's always welcomed.

Some new tools and instruments arrived in our laboratory. Preparation for new product development in progress.
Keep an eye on www.rowaves.com for latest news.

A team event very nicely organized by my colleagues from roWaves that brought together a large part of the team and collaborators in an event during past weekend. Thank you all for your involvement and for the beautiful moments! I can't wait to mobilize in larger numbers next time, in the summer, soon (and with those who couldn't participate this time...). The fishing "session" we discussed remains valid 🙂 Thank you! 🤗

Module didactice (oscilatoare Colpitts) de test si aplicatii de laborator, realizate impreuna cu studentii de la cercul de electronica de la facultatea de inginerie din Sibiu. Le-am pregatit pentru lectiile de la Compatibilitate Electromagnetica si cele de la Televiziune Digitala Terestra. Studentii de an 2 si 3 au lucrat sa le asambleze, iar cei de la master vor parcurge lectii practice pe ele. Cele 14 module sunt donatii din partea roWaves ca si prima etapa din proiectul de parteneriat incheiat. Proiect sub coordonarea Prof. Iulian Bouleanu si Prof. Toma Emanoil.

2-450MHz step toggle-switch attenuator work in progress. Some measurements performed already. Updates soon.

De ziua internațională a radioamatorismului, radioamatorii și toți clienții români pasionați de electronică, au transport gratuit la comenzi de min. 150 LEI plasate în magazinul nostru și primesc și un CADOU fain în colet :). Ce trebuie să faci?:

1) accesează www.rowaves.com/ro și selectează moneda RON-LEU ROMÂNESC (din meniul din dreapta lateral)
2) adaugă în coș componente sau produse de min. 150lei (TVA inclus)
3) la checkout verifică că plasezi comanda în lb. română și că moneda este RON iar totalul este fără transport la opțiunea FanCourier (ca în poza din primul comentariu!)

LA MULȚI ANI acestui hobby nobil! La mulți ani radioamatori!
echipa roWaves

Front and back panels for PA1000+ arrived. Updates very soon. Pre-order yours here:https://rowaves.com/juma-pa1000-1kw-power-amplifier/

Ne-a luat mai mult timp sa ne adunam, tot planuiam si pana am sunat si confirmat cu toti radioamatorii din Sibiu sau care s-au mutat aici, a durat ceva. Zeci de telefoane si discutii, rabdare si consultare. Dar iata ca ne-am intalnit (deja suntem la a 2-a intalnire saptamanala). 25 suntem in grupul de WhatsApp, cel putin 10 ne-am intalnit la noul sediu al radioclubului Sibiu, YO6KME-Radioclub Sibiu. Totul a fost posibil cu ajutorul colegilor implicati Buta Andrei YO6XK, Vlad ionescuvlad.com YO6LZP si Dorin Antonovici Dorin Andrei-YO6RXV si evident cu amabilitatea tuturor celor ce au acceptat si participat. Ne-am propus multe, le luam cu pasi mici. Toate infrastructura (sediu, materiale, indicativ autorizat, organizare, antena etc.) si cred ca multe din ce sunt necesare pentru intalnirile dintre radioamatori sunt deja puse la dispozitie si organizate. Inclusiv statie de radioclub, mai modesta acum. Ne vedem saptamanal lunea, 18:00-20:00 pe Calea Turnisorului 36, Sibiu si in fiecare seara pe repetorul din Sibiu (YO6X), orele 21:00. 73 de YO6TJJ

A new lot of 10 units (and last one!) from this product (we will discontinue this product) it is available on stock: MHW-4217, compact 40/20/17m, 10W CW (20W SSB) portable mini-tuner antenna with total length of 1.4m, 120g, SWR

A8OK DX Expedition in Liberia is using 6 x PA1000 amplifiers, among other equipment. Details:
https://www.cdxp.cz/

Vlad YO6LZP Vlad Gabriel Ionescu visiting us yesterday for a nice discussion about re-starting an older community project. News soon 👍🙏

30dB step attenuator project design. Measurements on going. PA3HCM as design starting point. Thank you Alex YO9IZU and Sabin Stimer YO6SRS for your extensive support and ideas 👍
https://www.pa3hcm.nl/?p=539 . Measurements will be published soon.

Time to build some serious 1kW+ range amplifiers 😍

1kW dummy load prototype, work in progress. Thank you Dutu YO5OWF and Dragan Andrei for your valuable help in desing and mechanics. Very soon in testing 👍

Un prim pas dintr-un parteneriat in care speram sa ne implicam cat mai mult concret si obiectiv, alaturi de Facultatea de Inginerie "Hermann Oberth" Sibiu. Aprox. 30 de studenti din anul IV, Electronica Aplicata, ne-au vizitat ieri in cadrul unei sesiuni de tip mini-workshop de masuratori camp electromagnetic, principii de baza SDR, diverse mici demonstratii ale principiilor de modulare/demodulare etc . Studentii au fost interesati si au participat activ, am
fost surprinsi sa aflam ca au luat in serios disciplinele de "radio", contribuind activ. Au primit mici premii constand in 12 x reviste "Radio" la cei ce au fost cei mai activi si au raspuns cel mai mult intebarilor si subiectelor de discutie. Nu a fost doar prezentae, a fost interactiune chiar benefica. Acestea s-au datorat Dlui Prof. Iulian Bouleanu alaturi de care planificam acest parteneriat inca de anul trecut. Urmeaza actualizari, in curand mergem noi roWaves la facultate, cu sesiuni practice pe teme de compatibilitate electromagnetica, televiziune digitala terestra, tehnici SDR s.a.m.d.