I there such things as other antennaes that can increase range on a Fm Tx of other homemade designs?

Or you could use some sort of cone to collect the air waves and direct it using a dipole antennae to send frequencies long distances.

There certainly is, its called a Yagi style beam. I have a 21 element for 477mhz FM and it has an overall gain of about 19db. However there are good points and bad with using such an antenna.

Good:
Obviously increased Tx and Rx range
The ability to null out unwanted signals
Can locate the approx location of a person transmitting.

Bad:
It is very directional and requires a rotator
If you wish to talk 2 a group of people it can be difficult positioning the beam to hear all people.
A beam transmits the signal horizontally so if you live in a valley it wont have a good ability to get the signal over hills

With that said there is a 12db base antenna that works quite well and transmits 360 degrees available from Dick Smith here in Aust for about $170. I would suggest this as a first antenna and worry about beams later.
As for the dish....NO not on UHF FM CB

Is this Question for Pirate FM Radio. or,
As in the Amateur 2meter or 70cm bands ? or CB ??
>I there such things as other antennas that can increase range on a Fm Tx of other homemade designs?<

The question was on the Fm bug, three or two stage Fm transmitter and the Fm scanner bug.

So do you want to increase the transmit range of an FM bug?

How do you wish to use this bug, ie do you want it to remain hidden?

Do you want to increase it by antenna modification only or by circuit modification also?

Most FM Bugs in the UK are about 88 to 108 Mhz. 3 meter band.
Is this were the Question is referring to,
And depending on the running out put power (watts ) ?

You could use a waveguide if the frequency in high enough. Works well for more concealed situations!

The improved schematic of the 3 stage transmitter is what I copied off. I was wondering if it transmitts the distance of what it was intended too.

If you made your transmitter from a kit and the kit states that it will transmit eg 400 meters. Well this figure is normally more than what you would expect.

The reason is they test it on a flat open field free from anything that may hinder its operation.

When you use your bug transmitter if its inside a house, you have walls, metal objects, electrical items etc that will all effect the "range" of your transmission.

If you want to test its range, go to a flat spot. Have someone with a car tune the "bug" frequency in to their car radio. Then you walk with it and when you get out of range have them start their car and come pick you up and they can tell you how many hundred meters your "bug" transmits on the cars odometer.

Do you want to make it transmit further?

And do you want to keep it hidden or are you prepared to construct an outdoor antenna?

[This message has been edited by bangbangbooty (edited 01-13-2003).]

I suddenly realised that the old schematic was a dead transmitter and was transmitting elsewhere.
The ztx320 transistor was heating near the tank circuit and its base of where there was the 47 picofarad could be sending amplitude modulation. As where as the normal temperature would be at a 470 picofarad at the base of the transistor.
As on the improved schematic slowed heating cost.

I want to Know where it is actually transmitting to?

Most kit style bugs transmit in the FM broadcast band, from 88-108mhz

They can be adjusted either by stretching the tuning coil or by trim pot, if they are on the same frequency of a local FM radio station.

To find your bug frequency, put it near a TV or something that makes a noise. Then go in to another room and use a normal FM radio to find where it transmits. Or you could use your car stereo on FM.

I say go to another room because if a transmitter is very close to a receiver it may show up on other frequencies which are not its actual frequency.

Tim do you have a website where your particular bug is listed?

There are hundreds of types of bugs and it would be good if i can see the schematic to help you get the most out of your device.

Go to www.kitsrus.com then go to search. Then click on kit 32 for three stage transmitter.
Its not mine but it shows the picture and schematics and all.