100 W Linear Amplifier for HF bands     Last update 2012-08-19
JUMA PA100 with analog control


JUMA PA100 is a small size true 100 W linear amplifier for all amateur HF bands. The amplifier is available as a component kit. There are two models available, the PA100 with analog user interface and the PA100-D with digital user interface.

The JUMA PA100 amplifier can be used with any low power transceiver or transmitter with output power range of 2.5W...10W.

The size of the JUMA PA100 is compact and it is equipped with a fan in the heatsink. The fan is typically OFF during normal QSOs and it starts only when needed. The fan is very quiet.

The DC supply connector in the rear panel is a standard DC socket used widely in Yaesu, Kenwood and Icom rigs.

The exciter RF connector (TRX) and antenna RF connectors (ANT) are BNC type sockets.

The transmit/receive (T/R) switching needs no cables when using the JUMA PA100 with JUMA rigs e.g. JUMA TRX2. A small DC signal in the coaxial cable between JUMA exciter and the PA100 is used for transmit/receive switching. With other exciters a cable with a 3.5 mm jack plug is used for T/R switching. See wiring.

JUMA PA100-D rear view

The digital model PA100-D includes two additional connectors in the rear panel. A jack type
RS232 connector for auto band tracking with JUMA TRX2. The RS232 connector is also used to upgrade PA100 firmware. The other additional jack connector is a Yaesu standard DC band control input. See wiring here.

The construction is modular.
The modules are:
- RF Amplifier Module
- Main Board Module
- Analog Control Module
- Digital Control Module
- Frequency Sense module

All the interconnection are using flat cables. See the drawings.
JUMA PA100 Analog model construction
JUMA PA100-D Digital model construction
JUMA PA100-D with digital control

General features
- Nominal output power 100 W (PEP up to 150 W)
- Clean output, see IMD measurements
- Supply voltage nominal 14 VDC (range 12 VDC...15 VDC)
- Typical peak current 16 A, overcurrent protection at 24 A
- All HF bands: 1.8, 3.5, 7, 10, 14, 18, 21, 24 and 28 MHz
- Input power range 2.5 W...10 W
- Adjustable gain in 2 dB steps
- Overcurrent protection
- Over temperature protection
- Temperature controlled fan
- T/R control via the coax cable with JUMA rigs
- T/R control via connector in the rear panel (for other rigs)
- Dimensions: W182 mm, D164mm, H60 mm. Wieght 1.2 kg

Analog model features
- Rotary switch user interface
- Relative forward power indicator
Relative reverse power indicator
- Heatsink temperature indicator
- Supply voltage indicator
- Current indicator
- Protection indicator LEDs

PA100-D Digital model features
- Push button user interface
- Multifunction LCD, adjustable brightness & contrast
- Output power indicator
- SWR indicator
- SWR protection
- Adjustable protection limits and fan start temperature
Heatsink temperature indicator
- Supply voltage indicator
- Auto band tracking (RS232, DC control or frequency sense)
- Manual band
selection is also possible
JUMA PA100-D User interface
JUMA PA100-D LCD functions
JUMA PA100 RF amplifier module

The Analog Model PA100 can be upgraded to the digital PA100-D model at any time by changing the Control Module and adding the Frequency Sense Module.
JUMA PA100 main module

The main module includes the RF connectors for exciter/antenna and the T/R input jack socket. See more details in the Technical kit information link.

Copyright OH2NLT and OH7SV. Specification subject to change without prior notice.
JUMA® is a registered trademark of Juha Niinikoski and Matti Hohtola