Receivers for LF and MF 136 KHz @ 477 KHz A question, Starting at the £5 dongle rigged for direct sample , as a cheap effective starting point A pre amp and pre - selector [ band pass filter ] would
web sdr using , low ish price, , compact sdr and mini whip .. any one used this 100K > 30 MHz [ vhf possible ] sdr ? http://g7jjp-websdr.no-ip.org:8901/ http://www.afedri-sdr.com G, From: g8fzk@g8fzk
Hi Graham ! This type of device has a dynamic range of 48dB at maximum (8 Bit), so they need help from a narrow-band frontend plus input-attenuators to reduce the load to the A/D-converter. The conve
Yes Tobias, All is not as it seems , but as you say , adding filtering , reduces the problems , and with direct conversion , the noise floor is the lowest possible , stability is at maximum , having
Hi Graham, RA17 with beam deflection mixer? Surely not....... I would certainly agree with you about the RA1772 (and extended family) but I like using both - and a (fairly) complete set of RA17/MA79
Hi Paul, Yes , the later version , may be the 117 or the fine tune version for the Navy used the 7360 , probably about as good as it gets , I spent some time on production test when the ra1771/2 was
Hi Graham, I don't think the '117 had a beam deflection mixer either but I'm not sure. I've got one in the garage awaiting (for several years now....) renovation - will have to have a look. I didn't
Hello Graham, An other good receiver is the ELAD FDM-S2 SDR, albeit a bit more costly than the Afedri. I believe you can set up four receivers with the software. Hartmut from Germany uses one for mon
Hi Graham ! The foremost problem of the Barlow-Wadley receiver is the generation of the LO by a comb harmonic oszillator (in German : "Lattenzaungenerator"). Receiving an unknown signal you could nev
Thanks Roelof Thats a good recommendation ! 73-G, Hello Graham, An other good receiver is the ELAD FDM-S2 SDR, albeit a bit more costly than the Afedri. I believe you can set up four receivers with t
Ok Paul The Navy has extra IF , the slow motion tune is another down conversion to , I think 50KHz IF ? I was not involved with the remote versions , but , yes the boards are similar , the ra1778 has
