Hi I checked with Garmin on this and they're standing by their 1 microsecond spec. They suggest using the GPS25-LVS (which apparently has a mode where you can specify that the location is fixed and l
Hi dear All, I am seeing a faint broken line on 137.789.5 +/- 0.1Hz right now (using Argo set for 60s dots). What dot length is Larry using? 73 Johan SM6LKM
Hi Mal, Not sure about smoke signals but I do not think so, they were probably faster than slow morse. Haha! Well, I think you are wrong. G3YXM's recent experiments with a parallel RF/smoke transmitt
Hi Uwe first line: lf-meteorites ? Yes, probably, or perhaps parts of MIR, hihi... To me, it looks like a QRSS station sending "DDK"... with severe QRH/QRI. 73 Johan Bodin SM6LKM
Hello A few months ago, I saw a download link for a homemade star map program for PC. I am almost sure that it was on a G amateur's homepage but I don't remember which one... I believe he is an LF en
Hi Laurie I don't know about the BDY62 but I have two marine NDB transmitter "wrecks" containing dozens of Delco DTS-423. These transmitters have been operating on 308 kHz here in SM in days gone by.
Hi All A long thin wire tied to a cluster of helium filled Durex units will dramatically increase the effective height of the transmitting antenna! 73 Johan, SM6LKM
Tom, John, I thought escargot were usually stuffed with garlic and baked in a medium oven! I suppose you mean mediumwave oven? Yes, why not... They can be baked in microwave ovens and now when experi
Hi Andy Your new RX design is interesting! Is the BFO phase locked to "an exact integer kHz"? If so, the DDS LO will be the only source of "odd steps". Clocked at 10MHz, it will produce an LO signal
Paul, An undersampling system needs some kind of sample & hold circuit. IIRC from digital audio, the aperture time should be less than T/10 (T=sampling period) in order to keep the high frequency rol
Paul, your thoughts about an undersampling LF receiver are very interesting! The "tunable crystal filter" solves the problem with multiple alias passbands associated with undersampling but there are
Andy, But isn't the accuracy and stability of a cheap colour subcarrier xtal, pulled more than 100ppm from its normal operating point, going to swamp the values you derive from the 'nice' numbers gen
John, 3579.545 kHz color burst crystal You are right! Thanks for the tip. I don't know if it is "easily pullable" though... I remember trying a "32 pF parallel 3579 rock" in series resonant mode but
Martin, you may wish to try the programs TANT136 and SOLNOID2 available at http://www.btinternet.com/~g4fgq.regp/ 73 Johan SM6LKM Any thoughts on loading coil design to drive it from the output of a
Hi Mal, I doubt that SM3UWI is active on LF. You probably had a QSO with Wolfgang SM3UWS (who is experimenting a lot on 136). Wolfgang's email address: [email protected] 73 Johan SM6LKM
SM6LKM MICRO That is correct! Thanks for the report. Wolfgang, DL4YHF, Du bist auch gehört worden. Is Wolfgang also transmitting QRSS on HF? 73 Johan SM6LKM
Hi dear All The QRPpp beacon is now on the air again with improved stability. Frequency is derived from the OCXO in my GPS disciplined freq. standard but the GPS antenna is down at the moment so the
Andy, What was the frequency ? Somewhere in the vicinity of the 80 meter band, probably.... It is drifting a few Hz around 3593.55 kHz. A mixer/BPF/PA is on the workbench. It will eventually become G
