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The Veronica 1W PLL FM transmitter was first marketed in 1996. In early 1998 the PLL 2 was released and then in January 2000 the PLL 3 ‘Easy-Tune™’.Without any amplifier tuning the PLL 3 produced a flat 1W output from 87 to 109 MHz and greater reliability with an improved cooler running broadband RF output amplifier using a 1.8W RF output device. In 2007 the PLL6 was released, this included the addition of a fine frequency adjustment to the reference crystal and dual varicaps for more linear modulation and better Deviation Sensitivity Stability as defined in ETS 300 384 (EU Spec.), this should be less than 3% from 0 to +40 Deg C, the PLL6 was better than 2% from -20 to +40 Deg C. This ensures that the deviation will stay almost constant whether you are in Siberia or Africa. On to 2009 and the PLL8 was born, this had the addition of a power control, an even higher rated output device (SD1127, capable of over 4W), and better than -63dB RF out of lock muting.

The Aareff / Veronica PLL is known throughout the world as professional class equipment at excellent value for money. Thousands of stations throughout the world now use Aareff / Veronica products for high quality broadcasting.

Backwards Compatibilty

The PLL sub-assembly is still compatible for repairing or re conditioning any Aareff / Veronica transmitter made since 1997. Virtually all the parts for the 1W PLL are readily available all over the world should you ever need spares. The PLL circuitry is 100% hardware controlled and will never suffer from software bugs or processor crashes. The ICs are the standard 74HCT… series and CMOS 4000 series.

FM Stereo Coders and RDS

You can use our stereo coder with Veronica 1W PLL FM transmitter or you can use stereo or RDS coders or software packages from other manufacturers. We are currently looking into the use of http://www.stereotool.com/ and similar products. If you are a software developer and would like to try your products with us, please contact us.

20 Years Of The Veronica PLL

We are now on version 9 of the Veronica PLL and it’s still going strong. Over 2o years we have made various improvements and slowly evolved the PLL into the amazing module it is today. This PLL exciter meets the broadcast standards of the FCC in the USA and ETSI (CE Mark) in the European Union and through hard work and our passion kept the same low price for the entire 20 years.

Still A Best Seller

This PLL FM transmitter is still one of the best selling sub-assemblies for broadcast engineers wishing to construct, assemble and experiment with their own designs. The dual varicap arrangement provides very low audio and phase distortion with excellent frequency response from low bass frequencies right through to 76 KHz making it highly compatible for RDS coders. If that’s not enough the noise level is almost immeasurable at more than -80dBu, this is achieved by using a lightly loaded high stability half frequency push-pull Hartley oscillator for generating the RF signal. The output of the Hartley oscillator is configured as a frequency doubler using a push-push arrangement, filtered and amplified by two high stability amplifiers to 1 watt.

This PLL synthesizer is specially optimised for high quality wide band FM with selectable pre-emphasis. CD’s and other audio sources are reproduced with the finest of clarity. Setting up the unit is made easy using the built in LED’s that indicate power output and lock conditions.

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Technical Specification

(87.5-108MHz) User Programmable

RF Power Output
1000mW to 1400mW into 50 Ohm load

Deviation Sensitivity Stability
+/-2% max

Spurious Emissions
>75dB rtc

Harmonic Emissions
>63dB rtc

Out of Lock RF Muting
>63dB rtc

Freq Stability
+/- 1 KHz max. typ. +/-300Hz

Freq Fine Adj (VC2)
> +/- 1000Hz

RF Output Connector

Audio Input Sensitivity
0.775 V rms for +/- 75 KHz

Signal To Noise Ratio
80 dB

Frequency Response
Flat from 30 Hz to 76 KHz

(50uS/ 75uS/ None) Selectable

Audio Distortion
Better than 0.02 % THD

Audio Input Connector
Phono/ RCA type unbalanced sockets

Power Supply
15V DC Regulated 650mA max.

Version 9 Improvements

1. Additional low pass output filtering, this is to make absolutely sure the RF output socket produces a close to pure signal, the harmonics are close to -70dB or better this allows the output to be directly connected to an antenna without any further filtering.

2. Double sided higher quality printed circuit board, this increases the RF ground plane which in turn makes the very stable VFO even more stable, the result of this is less phase noise and jitter which gives better baseband signal to noise ratio. This only is possible due to the Veronica PLL have a large printed circuit board. Basically more copper, more ground, more stability. The additional ground has also improved the EMC performance making sure it can easily pass the EMC tests for CE marking when fitted inside an enclosure.

3. Change form solder pins to terminal type plain screwdriver connectors for all input and outputs, this was at the request of engineers that work in the middle of deserts and other similar places where service due to soldering is difficult, now the 1W PLL can be installed or removed by only using a small electrical screwdriver. The indication LEDs are now together in what we call the front edge of the board. They can be taken out and there are additional holes on the board to fit more terminal type connectors allowing LED’s to be extended on wires to the front panel of an enclosure.