Re: PL-390 External LW MW Antenna Mod
Thanks Rick,toggle quoted message Show quoted text
Glad to know the '310 mod worked. I too am dismayed by the quality of the warped ferrite rods.
You asked about the ferrite in the '390 and how that radio compares to other ULR's. Well in my '390 the ferrite rod is 4 5/8 in (117 mm) long and 0.4 in (10 mm) diameter with two opposing flattened faces- a substantial improvement compared to the '310, which is the only ULR I have for comparison.
A rough and unscientific test, comparing weak and non-fading stations on the '310 and '390 radios, showed about a 5 dB RSSI and SNR advantage to the 390 consistent through LW and on up to around 1200-1300kHz on MW. The high end of MW (>1300 kHz) could be much closer between the two radios although I didn't have enough candidate stations to do more measurements so that is only a speculative conclusion at this stage. A sig gen driving a standard loop a la Gary DeBock's tests would be needed to sort this out.
Perth, Western Australia
--- In ultralightdx@..., Rick Robinson <w4dst@...> wrote: