VOLTAGE CAIN: 40 db minimum COMPRESSION RANGE: 30 db minimum

FREQUENCY RESPONSE: Flat 20 to 20,000 CPs (without RF1 filter)

Flat 20 to 5,000 cps (with PFI filter)

\HPUX impedance: 0.5 megohm


ATTACK TIME: 1 millisecond maximum (lime required to reach lull compresion from zero compression)

RELEASE TIME: Approximately 2 seconds jtime required lo reach zero compression irom lull cDmpres^ron)


3 — npn silicon transistors 1 — pnp germariigm transistor 1 — garmamum J;cde

FRONT PANEL: Inpul level eonwot wilh on/off switch, 3-Way phane

JacK for input connection

REAR PANEL Ouiput level control, 3-way ptione jack for output connection, terminal strip for external power connection

POWEfl REQUIREMENTS: 9 VDC io 12 VDC 3 ma to 5 ma

MI5C: FurnEShecJ with two matching phone plugs, high quality MIL-lype giass-epoxy printed cirnui: board. anil easy-to-follow instructions


PRICE: Model ACP-1 KIT 116 50'

Model ACP-1 WIRED S26.50'

FO.B. Upland, California *fess battery

Promoting vhf

An excellent way of promoting contacts, friendship, and interest in ham radio on the vhf bands is to collect a list of operators on a particular band and mode. In many areas the vhf bands are sparsely populated and for this reason there is much dependence upon ground wave contacts to keep the bands alive. Collecting the call, handle, and city of all known operators within a 200 to 300 mile radius and sending a copy to each new operator along with your qsl creates a feeling of comradeship which can't be gotten any other way. The new man appreciates being a part of the gang, knowing everyone's handle, and what to expect in the way of contacts.

Keep your list current by adding and deleting as soon as changes are made and making new copies at regular intervals. The list will be most useful if some blank lines are left for additions to be made between issues.

Usually there is someone in the area who has access to a copier or mimeograph, who can make copies at little or no cost- Postage costs the same as a qsl when the qsl is stapled inside the list and the two are sent together.

William P. Turner, WA0ABI

The unit was tried both using an interna) battery and powered by the 12 volt line in the SB-3'4. In the latter mode, for best stability, it was found necessary to use a 100 pf bypass and a 100 ohm/50 ¡if decoupling network on the 12 volt line to the ACP-1. The need for these components may partially have been due to the use of an unshielded cable between the SB-34 and the ACP-1.


The ACP-1 confirmed its specifications as a superior compressor unit. The emphasis in the ACP-1 kit seems to be more on hardware rather than software but, in this case, the emphasis is certainly correctly placed.

The output level control is generally not necessary when the unit is used with a transmitter having a microphone gain control. This "surplus" control space on the back panel plus the space still available in the ACP-1 enclosure sorely tempts one to compact into the enclosure other small transistor or IC station accessories, such as tone generators, VOX or keyer units. 1, in fact, easily put an IC keyer that was unhoused into the enclosure and there is still room for a VOX unit.

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