With this article, we want to thank one of our beloved customers, Massimo, for his feedback after the installation of our IFace inside his JRC NRD-535.
He sent us some pictures and some suggestions. In particular, he wanted to share with us the idea to move the power supply point to another one on the contrary of that suggested by us.
This is because he experienced some noise during the reception on the SDR. The noise was coming from the processor and other digital circuitry, so he preferred to power the IFace from the +9V on the MOTHERBOARD. Please see the images below.
The operations to be performed are very simple, it is sufficient to obtain from its wiring diagram the information on the points where to take the IF signals.
This radio uses different mixers. In particular, we will have to use the first one of the RX chain because we will have a wideband signal aroud the IF frequency (that is 70.455 MHz). The following images show the block diagram of the radio.
The following images show the portions of the schematic diagram of the RF TUNE and of the MOTHERBOARD where we can see the exact points where to sample the IF signal and the power supply.
We now proceed to identify the exact points on the printed circuit board where to take the IF signal to be sent to the IFace. The following images show the sampling point for the IF signal and for the power supply for the buffer interface.
The use of PTT signal is not required, it’s a receiver!
In order to purchase an IFace use the buttons below.
ATTENTION: Though installing the IFace is not difficult, you do this at your own risk. TSP S.r.l. is not responsible for any damage, unwanted side-effects or whatever.
For more information, do not hesitate to write to us using the form below. Have fun!
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