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1W PLL 'EASY-TUNE™' TRANSMITTER (PLL8)
HIGH PERFORMANCE KIT RANGE
Perfect Audio Every Time.....
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The PLL8 is released, new features include power output control, higher rated output device to prevent failure under extreme VSWR conditions, out of lock RF muting of more than 60dB and increased RF output filtering to ensure compliance with European Telecommunications Directive ETS 300-384.
The Aareff / Veronica 1W PLL 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.
This PLL 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 -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. On listening tests when a CD was played through the PLL6 using a Denon 1500AE tuner it was virtually indistinguishable from a direct connection to an amplifier.
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.
This PLL synthesizer is specially optimised for high quality wideband 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.
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.
The measurements below were carried out at 13.8V DC over the temperature range 0°C to 40°C.
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Frequency
RF Power Output
Deviation Sensitivity Stability
Spurious Emissions
Harmonic Emissions
Out of Lock RF Muting
Freq Stability
Freq Fine Adj (VC2)
RF Output Connector
Audio Input Sensitivity
Signal To Noise Ratio
Frequency Response
Pre-emphasis
Audio Distortion
Audio Input Connector
Power Input
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(87.5-108MHz) User Programmable
Typ 1000mW into 50 Ohm load
+/-2% max
>75dB rtc
>60dB rtc
>60dB rtc
+/- 1 KHz max., typ. +/-300Hz
> +/- 1000Hz
SO239
0.775 V rms for +/- 75 KHz
80 dBu
Flat from 30 Hz to 76 KHz
(50uS/ 75uS/ None) Selectable
Better than 0.02 % THD
Phono/ RCA type unbalanced sockets
13.8V DC Regulated 650mA max.
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