This item will be sent through the Global Shipping Programme and includes international tracking. Connect a resistive load of proper value 5KQ for output taps appropriate to use with to the output of the modulator. This item may be a floor model or an item that has been returned to the seller after a period of use. Insert the “hot” meter lead Into either one of the TEST pin jacks and touch the common or ground meter lead to any unpainted pointon the chassis ground. Add to Watch list Add to wish list.

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Add to Watch list Add to wish list. This completes the balance adjustment, whereupon the meter leads can be removed from the TEST jacks. Back to home page Return to top. nodulator

Check the adjustment by speaking in- to the microphone quite loudly; loud speech should not be able to cause over. The out- put of the clipper is fed throughalow pass filter LI, Mkdulator, and C6 to suppress high order harmonics generated by peak clipping.

Connect the a-cline cord to the a-c power line, and then set the AC switch to ON. Cut off the stripped end of theblack-red lead.

For additional information, see the Modulatog Shipping Programme terms and conditions – opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees.


If it is not loaded, the voltage on the mod xfmr may exceed the winding rating and short out the xfmr You can improve both the Ranger and the with minimum changes, but the Ranger will never sound as good as the in my opinion.

The resistor loads the mod xfmr properly while still allowing you to hear the waveform. Speaking into the microphone in a normal voice from a normal distance about 6 inches.

Eico 730 modulator/ driver

It had a great working clipper circuit, which the Ranger and DX60 did not. That would be 40mW of audio. But at that point in your career, you might be ready for a BC after building the Eico kits up and learning from them. Sets voltage levels at which 370 signal is modulwtor.

Controls gain of microphone preampll- fier. Connect and solder the black-green lead to AC switch terminal Sl Very few ham rigs included feedback in the stock circuitry.

Assuming you have a schematic, the mods are as follows, in order of importance. The high-power modulator will usually have a plate meter which serves this moeulator. Bias is obtained with an un-bypassed cathode resistor R6, which also provides negative feedback for reduced dis- tortion in this stage. Yes, you will need a matching transformer.

Eico AM Modulator

The common modultaor noted with the DX60, Ranger, and others plagued the rotary mode switch in the Eico A negative voltage then appears at the grid of V6, causing the two green indicating bars of the tube to overlap. Any ohm to 8 ohm should do for your purpose as long as you don’t exceed its power handling capability. At the ON position, the center-tap is internal- ly grounded in the modulator and remote switching is dis- abled. Clipping gets a lot of bad press due to bad design of some rigs, and the over use of clipping by meter-benders.

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The latter permits the modulator to be tuned on and off by a set of contacts in the antenna change-over re- lay “off” when transmitter Is set to “standby”, and “on” when transmitter Is set to “transmit”. It eio included a novel over modulation indicator which warned when hitting peaks below 0 percent, which would cause splatter.

Change C2 and C3 to 0. This Buy it now listing has ended.

Eico modulator/ driver

To do this, it will be necessary to remove the bottom plate and connect the black-green lead V power transformer primary tap to the AC switch terminal Sl-1 instead of the black-red lead V primary tap. At thst point you can measure safely with a scope or connect a speaker modultor headphones.

The VFO has another tube for good isolation and more drive. Change C8 and C9 to 0.