Low range on Rf band / schematic question

The operation of transmitters designed to jam or block wireless communications is a violation of the Communications Act of 1934, as amended ("Act"). See 47 U.S.C. Sections 301, 302a, 333. The Act prohibits any person from willfully or maliciously interfering with the radio communications of any station licensed or authorized under the Act or operated by the U.S. government. 47 U.S.C. Section 333. The manufacture, importation, sale or offer for sale, including advertising, of devices designed to block or jam wireless transmissions is prohibited. 47 U.S.C. Section 302a(b). Parties in violation of these provisions may be subject to the penalties set out in 47 U.S.C. Sections 501-510. Fines for a first offense can range as high as $11,000 for each violation or imprisonment for up to one year, and the device used may also be seized and forfeited to the U.S. government.

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Buggy222
 
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Joined: Wed Jun 10, 2009 6:56 pm

Low range on Rf band / schematic question

Post by Buggy222 »

I am trying to identify causes for the very low effective range I am getting on the RF band.

I noticed the schematic uses Sawtooth NE555D and shows an output on TR of 2.5VDC + 1.7Vpp. the Wiki build list uses LMC555 and I am getting an output more like 1.0VDC + 1.2Vpp. Is there something I need to change (R10 or 11) or is this level of output OK?

I also noticed with a simple voltmeter that when tuned I see a fixed voltage at the VCO tune connection. My voltage seems higher than the VCO specification for the freqency tuned, and the voltage does not seem to scan through the bandwidth.

Any suggestions would be appreciated.

Thanks

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