Sunday, February 04, 2007

Frequency counter with PIC

QRP rig is needed to know the frequency of receiving and sending signals. This frequency counter can be easily built for QRP rig. It uses PIC16F628 and few parts to construct it. The frequency range is 1 to 50MHz with 5 digits.

We may build it for QRP rigs to see the exact frequency of the band.

Friday, January 26, 2007

A POLL ON POLES

W7AQK, David wrote a quite interesting article about the fiber glass pole call Jackite.
Jackite is 31' fibler glass pole can be used for antenna pole. You may check this pole for your antenna support.

Wednesday, January 10, 2007

2SC1815 mini amp

http://www.geocities.jp/ja3dew/subLinerAmp/C1815CPL4.jpg

Saturday, January 06, 2007

QRP-L Mailing list

Here is the archives of QRP-L mailing list. You can find a lot of interesting information about QRP.

Thursday, December 28, 2006

MicroVert for the small antenna

The antenna is critical for QRP transceivers. The HF bands needs a large antenna for their wavelengths. I've found MicroVert for an efficient small antenna. This antenna has been developed by DL7PE, Juergen Schaefer. JA stations has the Excel sheet to calculate the radiator element length and the coil. The radiator lenght for 7MHz is only 1.33 meters and the counterpoise is 8.2 meters. The counterpoise isn't directly related to the radiation, therefore, you may put it on the foot of the radiators.

I'm trying to use this antenna for my qrp transceiver.