Belar Electronics Lab Inc
Belar Electronics Lab Inc Model AMM-3A, AM Modulation Monitor in Excellent Condition
- MPN:
- AMM-3A
- Condition:
- Used
- Shipping:
- $40.00 (Fixed Shipping Cost)
Frequently bought together:
Description
This Belar Electronics Lab Inc Model AMM-3A, AM Modulation Monitor, is in Excellent Condition.
This is a high quality meter that sold for around $3000.00 new. Since there are few sold outside of the broadcast industry suppliers, there is not much information on used prices.
This analog unit is much more impressive than the new digital versions.
I also have the original manual with schematic drawings and parts list to make service easy.
The calibration sticker indicates the year 2017.
This broadcast quality Modulation Monitor would work great with Amateur AM Transmitters and is very easy to set up and use.
Source: Belar Electronics Lab Inc
The Belar AMM-3A AM Modulation Monitor is an all-solid-state precision AM demodulator which exceeds the US Federal Communications Commission standards for measuring the total modulation characteristics of medium-frequency AM broadcast transmitters.
The Belar AMM-3A AM Modulation Monitor is an all-solid-state precision AM demodulator which exceeds the US Federal Communications Commission standards for measuring the total modulation characteristics of medium-frequency AM broadcast transmitters. The detector circuitry of the AMM-3A is non-frequency discriminating, so the unit is suitable for use with shortwave transmitters as well. The AMM-3A employs a unique analog divider circuit which maintains the accuracy of all indications despite changes in carrier level. Simultaneous indications of negative and positive modulation appear on two semi-peak reading meters. Negative and positive modulation peaks are simultaneously indicated on two thumbwheel-programmable peak indicators, as well as individual fixed negative 100% and positive 125% modulation peak indicators. Front-panel pushbuttons select meter indications of relative carrier level and AM noise. The AMM-3A incorporates a carrier-level alarm which indicates when the carrier level falls outside the range required for accurate indications. Also included are an adjustable modulation-level alarm, and a calibration reference to check the accuracy of the readings at any time. An internal jumper can be set to apply the USA NRSC de-emphasis characteristic to the audio outputs.
FEATURES
- Two modulation meters for simultaneous measurement of positive and negative modulation
- Two adjustable peak modulation indicators, thumbwheel programmable from 1-99% negative and 1-199% positive modulation.
- Separate, dedicated 100% negative and 125% positive peak indicators
- All modulation indications independent of carrier level
- Semi-peak reading modulation meters respond accurately to short duration program peaks
- Built-in Carrier Level Limit (Loss) and Modulation
- Level Alarms with dry relay contact outputs
- Built-in modulation calibration check
- Linear-phase detector filter provides accurate modulation indications without overshoot.
- Switchable NRSC de-emphasis
Related Products
Hammarlund Four 20 Transmitter & Four 11 Modulator both in Excellent Condition
Hammarlund
$449.99
This Hammarlund Four 20 Transmitter & Four 11 Modulator, are both in Excellent Condition. They were made in 1947.
The Four 20 transmitter is a 20 watt CW transmitter. Whith the modulator...
Swan Model FP-1 Phone Patch in Excellent Condition
Swan
$49.99
This Swan Model FP-1 Phone Patch, is in Excellent Condition.
It with match and work with most Swan Radios and other brands as well.