VINTAGE HEWLETT PACKARD SIGNAL GENERATOR MODEL 606A POWERS ON FREE SHIPPING

You are bidding on a VINTAGE HEWLETT PACKARD SIGNAL GENERATOR MODEL 606A as can be seen in the pictures.

Feel free to check manufacturer's technical data by GOOGLING the following link: https://www.historyofrecording.com/Hewlett_Packard...

HP 606A/B, the Existential Signal Generator

The Signal Generator is a calibrated transmitter. Intended primarily to test system receivers. In the design, test and maintenance of any communication system, radar, satellite, Police radio, or wireless system receiver, there are phases when you need precise simulation signals that behave like the transmitter. Signal generators give you tunable signals, AM or FM or pulsed or digital modulation, and a very precise settable output level WAY down to -127 dBm, which reveals just how sensitive the receiver is.

In all those decades of early signal generators in the 1940s, 50s and 60s, some of which used Klystrons for the source, some like the HP 608 and 612, used tunable circuits with tunable power amplifiers for the output stage, they weren't ideal but they were pretty good. As you tuned frequency, set on channel, the frequency drifted a little, the output power at each new frequency was different, meaning you had to set the output power each time. And the modulation simulations were not so perfect.

And then, in 1959, along came Art Fong's HP 606A. It wasn't time for semiconductors yet, but it was time for an almost perfect design. Art chose to use capacitance tuned oscillators and power amplifiers. The vacuum tube oscillators gave LARGE voltage tank voltages, meaning a very low single sideband phase noise on the carrier. The drift was low but the HP 606B/8708A furnished a phase locking means to stop drift. The power amplifier had feedback on the power monitor, so you could just tune anywhere, switch frequency bands, and the power output remained rock solid.

The modulation function on the power amplifier had an additional high performance characteristic. It was a highly-linear detector at the output, which was part of the AM feedback loop, and forced the modulation envelope to match EXACTLY the input modulation audio. All the way up to 100% modulation. Wow. Now THAT was a signal generator. The customers LOVED that generator for its convenience and accuracy.

The Hewlett-Packard Model 606A is a general purpose signal generator with a frequency range of 50 kHz to 65 MHz. The instrunient has a direct reading frequency dial calibrated to an accuracy of 1%. Output is held constant within ± 1 dB and is continuously adjustable from. 01 microvolt to 3 volts into a 50 ohm resistive load. An internal crystal calibrator provides check points at 100 kHz and 1 MHz intervals with an error of less than 0.01%. A front-panel meter accurately indicates the percent amplitude modulation for frequencies within the modulation bandwidth of the signal generator.

The Model 606A has a highly refined amplitude modulation system which allows modulation up to 90% with low distortion and incidental FM. This feature makes possible precision distortion checks of receivers from antenna to output. The instrument can be internally modulated at 400 or 1000 Hz. It can be externally modulated from dc to 20kHz or more, depending on RF frequency in use. Complex waveforms, square waves, and dc voltages may be used to modulate the Model 606A for testing and evaluating filters, networks, amplifiers, and receivers.

The Hewlett-Packard Model 606A is a general purpose signal generator with a frequency range of 50 kHz to 65 MHz. The instrunient has a direct reading frequency dial calibrated to an accuracy of 1%. Output is held constant within ± 1 dB and is continuously adjustable from. 01 microvolt to 3 volts into a 50 ohm resistive load. An internal crystal calibrator provides check points at 100 kHz and 1 MHz intervals with an error of less than 0.01%. A front-panel meter accurately indicates the percent amplitude modulation for frequencies within the modulation bandwidth of the signal generator.

The Model 606A has a highly refined amplitude modulation system which allows modulation up to 90% with low distortion and incidental FM. This feature makes possible precision distortion checks of receivers from antenna to output. The instrument can be internally modulated at 400 or 1000 Hz. It can be externally modulated from dc to 20kHz or more, depending on RF frequency in use. Complex waveforms, square waves, and dc voltages may be used to modulate the Model 606A for testing and evaluating filters, networks, amplifiers, and receivers.So please do make us your best offer or ask any questions you may have and we will respond promptly!

We're a small school and sometimes are not available on the weekends, not always though, we always try to check our inboxes even from home but if we don't respond on the weekends that's probably why. Most of the time though you will receive a prompt response so we can move forward.

Sincerely!

Itibere Silveira

EACH PROJECT

Ann Arbor, MI

Stock # 211006