SWITCH & Fmeter Fmax – 210MHz Peter SP2DMB

5.03.2015

Upgrade 8.03.2015

www.sp2dmb.cba.pl

www.sp2dmb.blogspot.com

[email protected]

„SWITCH & Fmeter” – device with a few "faces" Dedicated to SDR TRX’s, conventional TRX’s, receivers, etc.

Automatically switches filters ! Controls the relays by GND ! Works with any SDR software or without ! If you need…- "SWITCH & Fmeter" can measure the frequency to 210MHz !!!

This switch is device to switching bandpass filters. Switching bands works on the principle of frequency measurement. At the entrance there is a single amplifier ( BFR92) and BAS70 diode forming the slope. The signal from the DDS is adjusted by - PR 1k. The signal is transmitted to the pre-divider by 2 -> 74LVC2G74. Next is divided by 4 to 74ACT74 and another 8 on the 74HCT393 and signal goes directly to the processor. It depends on how the software will be controlled by relays in the filters. Software can handle: - SDR devices, where the heterodyne signal is 4 times greater than the frequency (or other division) - TRX with IF frequency - The device with direct conversion Four signals go to the BCD decoder CD4514. The decoder controls transistors respectively. They can be simple BC847. If the current exceeds 100mA relay, use BC817 (500mA) or similar. And here I used a control relays by apply GND . Power system stabilizer is done by LM7805 - TO220 housing. This makes supply the system voltages from 8 to 25V. Serial diode 1N4148 (500mA) prevents damage of the system, if you make a mistake pins. The diagrams on the next pages.

This device is mounted on the PCB, tinned with solder mask. Board dimensions are 83x53mm.

These are mostly SMD components. The processor is in the THT, which will facilitate the exchange of.

Assembly diagram:

"SWITCH & Fmeter" connected directly to the DDS and SDR device. I tested with generator built on Si570 - CMOS version. On the input there is PR 1K which regulares signal level of the generator to switch.Adjust signal level so that it works correctly in whole range. Where and how to use the "SWITCH & Fmeter"? 1. SDR Do you apply a manual choosing of bandpass filters in your SDR ? This device automate this process. Clicking in the change of the band, the switch activates band filters.

The program reads the frequency of the DDS , compare with preset operating ranges, and controls the relays in the filters.

How to connect to SDR:

2. Traditional TRX’s After a change in the software, switch will work with any TRX with IF. There are other ranges programmed switching filters. Ranges will depend on the used intermediate frequency.

3. Frequency meter If you do not need to switch the filters, then plugging 2x16 LCD (HD44780 driver), we obtain the 210MHz frequency meter.

4. Relay control: GND Relays control must be configured . This is done using the "jumpers". They provide GND to the emitter. Connect collector of the transistor to relay.

Location jumpers for “GND” control:

PCB, which works without a display. Do not install a 10k PR and femmale goldpins the display. Do not install the resistor 510R, 0R and 27k also.

Installation of the display:

“Welcome” screen.

If there is no signal, we have this information:

Testing with SDR TRX AVALA-01 (1,8 – 50MHz). Test OK:

Test switch on LEDs: 1,8MHz

3,5MHz

5MHz

7MHz

10MHz

14MHz

18MHz

21MHz

24MHz

28MHz

50MHz

There are two LEDs on the bottom left side. They are designed for 70MHz and 144MHz bands and will be used in a traditional TRX. The total number of drive bands - 13.

Display frequency (SDRs – 4 x Freq.):

Direct operation, with DDS:

The photo above shows that the DDS and "SWITCH & Fmeter" work exactly !!!

Currently there are two software: - For SDR (/ 4) – name “SDR” - TRX with IF 9MHz to 10MHz – name “IF910” 1. Operating ranges "SWITCH & Fmeter" for SDR devices - divider by 4. Software name: "SDR" BAND - 1,8MHz - 3,5MHz - 5.0MHz - 7.0MHz - 10.0MHz - 14.0MHz - 18.0MHz - 21.0MHz - 24.0MHz - 28.0MHz - 50.0MHz

Switching range 1.0 –< 12.0MHz 12.0 –< 18.0MHz 18.0 –< 25.0MHz 25.0 –< 33.0MHz 33.0 –< 43.0MHz 43.0 –< 65.0MHz 65.0 –< 82.0MHz 82.0 –< 92.0MHz 92.0 –< 110MHz 110 –< 121MHz 121 –< 216MHz

SDR operating range 500kHz – 3MHz 3MHz – 4,5MHz 4MHz – 6.25MHz 6.25MHz – 8.25MHz 8.25MHz – 10.75MHz 10.75MHz – 16.25MHz 16.25MHz – 20.5MHz 20.5MHz – 23MHz 23MHz – 27.5MHz 27.5MHz – 30.25MHz 30.25MHz – 54MHz

2. Working range of device with intermediate frequency in the range 9.0 - 10.0MHz. DDS must to work over intermediate frequency. Software name "IF910":

BAND

Switching range

Operating range IF = 9MHz IF = 10MHz

- 1,8MHz - 3,5MHz - 5.0MHz

9.0 –< 12.4MHz 12.4 –< 13.9MHz 13.9 –< 15.9MHz

0 – 3,4 3,4 – 4,9 4,9 – 6,9

0 – 2,4 2,4 – 3,9 3,9 – 5,9

- 7.0MHz - 10.0MHz - 14.0MHz - 18.0MHz - 21.0MHz - 24.0MHz - 28.0MHz - 50.0MHz - 70.0MHz - 144MHz

15.9 –< 17.3MHz 17.3 –< 20.5MHz 20.5 –< 25.0MHz 25.0 –< 28.5MHz 28.5 –< 32.0MHz 32.0 –< 35.5MHz 35.5 –< 42.0MHz 42.0 –< 65.0MHz 65.0 -< 85.0MHz 85.0 -< 200MHz

6,9 – 8,3 8,3 – 11,5 11,5 – 16 16 – 19,5 19,5 – 23 23 – 26,5 26,5 – 33 33 – 56 56 – 76 76 – 191

5,9 – 7,3 7,3 – 10,5 10,5 – 15 15 – 18,5 18,5 – 22 22 – 25,5 25,5 – 32 32 – 55 55 – 75 75 – 190

Operating ranges can be programmed for any other intermediate frequency. This device will facilitate and improve both comfort and traditional transceivers SDR. And if we need a cheap frequency meter, due to its accuracy deserves a place in our "laboratory” “SWITCH & Fmeter” on YouTube: https://www.youtube.com/watch?v=dQZM6iv6cOE If you have any questions to me – write 

[email protected]

Vy 73

Peter SP2DMB www.sp2dmb.blogspot.com

www.sp2dmb.cba.pl

SWITCH eng.pdf

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