Design a yagi-uda antenna of 6 elements to provide gain of 12 db if the operating frequency is 200 MHz

Question edited for clarity.

Make sure you got the correct transducer Your model comes in single frequency and dual frequency. Make sure the connection on the back of the unit is good and you have no corroded or missing pins. Make sure the software is up to date.

Lowrance LMS-525C DF Fish Finder Parts

Product Description: Designed for salt water or downrigger tracking, this dual-frequency sonar/GPS chartplotter
provides additional 50 kHz readings, in addition to a high-res 480 x 480 display on a 5" screen
and many professional features.

* Dual-frequency 50/200 kHz
* Precision 12-parallel channel external GPS+WAAS receiver
* Lowrance radar compatible
* LowranceNET® networking (NMEA 2000® certification pending)
* High-speed ethernet connection links multiple Lowrance display units and modules to
operate independently on shared network data, including sonar
200 khz transducer PDRT-WBL Part #106-89
Shoot-thru-hull mount, 20 degree pod type with remote temperature (200 kHz). (20 ft cable) Dual Frequency Transducer HP-DFBL260 Part #106-82
Thru-hull-mount, dual frequency bronze housing, high-power multiple element (50 kHz 19 degree
& 200 kHz 6 degree).

HST-DFSBL Part #106-77
Transom-mount, dual frequency skimmer with built-in temperature sensor. (25 feet of cable)

https://www.google.com/search?q=lowrance+lms-525c+df+software+update

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Have a look at the link below for basic troubleshooting techniques for RCA modem

Troubleshooting DCM 315

Get a copy of the ARRL Antenna handbook. It is probably the best book out there for building antennas.

Move closer. That's not always an option though. Here are some tips to improve the range of wireless routers:

1) Locate the router higher in the building rather than lower (1st or second floor is better than a basement location).

2) Place the router in a location that will offer the least resistance to the signals - it is easier to pass wifi signals through gypsum board than it is for concrete / brick or walls with aluminum siding on them.

3) Change the antenna(s) on the router to a type that offers more gain. Typical router omni directional antennas offer 3dB to 5dB or gain - there are others that offer 7 dB or more of omnidirectional gain for reasonable prices. The antenna gain works for both transmit from and receive to the router.

4) if the device you wirsh to connect to the router is in one place, consider a directional Yagi antenna. These antennas concentrate the entire wifi signal in a direction that is 30 degrees wide and can allow the signal to be seen 5, 6 or even more times further in one direction - instead of being spread out over 360 degrees. These antennas cost a little more, but can solve the problem quickly.

5) Replace the manufacturer's stock firmware of selected routers with a 3rd party type such as DD-WRT or Tomato. Either of these will work with your Linksys WRT54G router. One of the benefits is the ability to boost output power of the wifi radio in the new settings the firmware offers. Read about both and decide if either is something you're comfortable doing.

6) Add additional wifi routers configured as a bridge or an access point to extend the wifi signal into an underserved area. DD-WRT supports bridging as shown here.

I hope this helps & good luck!

Adj VR1 next to VR2 they are in the center of the main motherboard. VR1 will allow you to adj the S meter in AM mode only.

To be able to get the same distance in all directions for local use the best type of antenna is a vertical with as much gain as possible. Most makers quote gain in db and this means how much better the antenna is than a plain wire antenna. This antenna will also work for dx on sidebands but the signal goes out in all directions the same distance.

If you want to get a longer range in one direction you have to sacrafice the distance in other directions. To do this you need a directional beam antenna. There are several brands with very little between any of them. What you need to be looking at, if you decide to use a beam type antenna is either "yagi" or "log periodic array" antennas. These are types of antenna rather than brand names. The log periodic array will give the longest range and the yagi will give the next best. Log periodics are very expensive but give the best results. Yagis come with different amount of elements. The more elements it has the better it works but even yagis with 3 to 4 elements give significant improvements over vertical antennas. Because both these type antennas concentrate the signal in one direction you need to be able to rotate it to the direction you want to send, and receive, the signal unless you only want to send it one direction. This means that you might need a mast and rotator which allows you to turn the antenna from a control beside the radio. These make the hobby even more expensive so it depends on how much you can afford to spend. Also make sure that the antenna you buy is resonant on the frequency you'll be operating on i.e. 27Mhz. Otherwise you'll burn out your radio. If you google the different types of antennas you'll find places selling them. You can also buy an antenna tuner that matches antennas to your radio if the frequency is not exactly matched to the radio. It reduces your power out a little but makes very little difference to the range of your signal. Also get the antenna as high as possible to a maximum of 30 feet. After that the gain is offset by the loss of signal through the co-ax cable. Use low loss co-ax cable to reduce the amount of signal you lose between the radio and the antenna.

Having said that I've contacted America from the west of Europe several times using a vertical antenna so you might not want to go for the best.

You need to be aware that there's an eleven year sunspot cycle which affects the long range radio communications. At the height of the sunspot activity you'll get long ranges without any difficulty and at the low you'll rarely get long range. At the moment we're just coming out of the low so it will be another few years before we reach a high. Just don't judge your dx activity on how well you do at the moment.

Good luck with the radio and if you enjoy it consider becoming an amateur radio operator. It gives you more frequency bands to use so the sunspot activity doesn't limit you so much as other frequencies improve with low sunspots. I started off with CB and am now an amateur radio operator for over 30 years.

Sure. Specs are listed below. I think it's designed for regular 2-channel input, isn't it?



Front Channels: 100 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)

Rear Channels: 25 W RMS x 2 @ 1.5 ohm-4 ohm(11V-14.5V)

Subwoofer Channel: 250 W RMS @ 1.5 ohm-4 ohm (11V-14.5V)

THD at Rated Power: <0.03% @ 4 ohm (F&R), <0.05% @ 4 ohm (Sub)

S/N Ratio (F&R): >108.5 dB below rated power S/N Ratio (Sub): >95 dB below rated power

Frequency Response (front and rear): 5 Hz-30 KHz (+0, -1dB)

Frequency Response (sub channel): 5 Hz-500 Hz (+0, -1dB)

Damping Factor (front and rear): >200 @ 4 ohm/50 Hz

Damping Factor (sub channel): >500 @ 4 ohm/50 Hz

Input Range: switchable from 200mV-2V RMS to 800mV-8V RMS

Differential-Balanced Input Topology: (3 pairs of inputs)

Front Crossover: fully-variable (50 Hz-5 KHz), selectable- slope BP or HP (12 or 24 dB per octave)

Rear Crossover: fully-variable (50 Hz-5 KHz), selectable- slope HP (12 or 24 dB per octave)

Sub Crossover: fully-variable (40-200 Hz), selectable-slope LP (12 or 24 dB per octave)

Preamp Output: 2-channel (full-range or LP)

Bass EQ: Variable boost up to 15db

Infrasonic Filter: defeatable 24dB/octave at 30 Hz

Left minus Right Ambience Circuit: ambient effect for rear channels

Front and rear speaker output connections: accept up to 8ga. wire

Dual mono subwoofer output connections: accept up to 8ga. wire

+12V and Ground connections: accept up to 4ga. Wire

Dimensions: 19.7"L x 9.25"W x 2.36"H

You will need to buy a signal amplifier antenna. One that doe not have to be connected to the radio. It will provide the amplified signal and the radio antenna (the a/c line cord and the back of the clock/radio) will be able to pick up the signal from the amplified antenna.[http://www.radiolabs.com/products/antennas/am-antenna.php] this web link will show you one type of these antenna's. Copy the web link and paste it into the address bar in your browser. It will take you to the website. There maybe other types of these antenna's but this one had the best price. Call the store and talk to them before you buy the antenna to make sure it will work in your situation. I hope this information helps you with your antenna problems.

Hello huko,

I see from your profile that you are in Bulgaria. Assuming that you are using the European PMR446 version of the Uniden radio in question, the channels / frequencies should be;

1 - 446.00625 MHz
2 - 446.01875 MHz
3 - 446.03125 MHz
4 - 446.04375 MHz
5 - 446.05625 MHz
6 - 446.06875 MHz
7 - 446.08125 MHz
8 - 446.09375 MHz
So, to operate on 446.09375 MHz you would chose channel 8.

If your radio has more then 8 channels, then you may have the U.S. version of the radio which operates on a different set of frequencies and does not have a channel that corresponds to 446.09375 MHz.

Best Regards,
Ken
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