Basic rate ISDN lines usually have a locally powered (ac mains wall wart etc) NT at the customer premises-if the power goes off this will stop 'talking' to the exchange end-which it is normally doing
Italian site faster in ZL Dave ZL3FJ Could you please all of you do me a favour ? As you may know, my Web site http://www.weaksignals.com is physically hosted by qsl.net, which more often than not is
A timely reminder, thanks Peter-- I have a quantity here still - way up on a back shelf inside several thick plastic bags. I need to safely dispose of it.......maybe I should keep just a small amount
Is anyone using the Ten Tec RX320 regularly for LF work?? (either with a converter or with the AMRAD mod to the 320 itself) Interested to hear any feedback, good, bad, or indifferent. 73 Dave, ZL3FJ
Chris Most of your losses will normally be in your ground system - not the loading coil. Amateur LF vertical antenna systems of necessity have severely constrained (size/efficiency) ground systems. S
Possibly the late ZL2BT-QTH was on the east coast of the north island, and he did have rhombics (plural!) 73 Dave, ZL3FJ In the early 60s I had several QSOs with a ZL station who used to put out a co
That's right,Ed. But Peter didn't get his antenna farm until about the early 1970s when he shifted out of town (he used to live about 2 km away from me) - ZL2BT was running big rhombics quite some ye
The SWR measuring trolley was a standard piece of kit at multi-tx HF transmitter sites with multiple openwire antennas and feeders. Keep in mind the real estate involved was large, very large, and wh
Loop induced emf(volts) = 2*pi*(field strength in v/m)*(loop area in sq. metres)* (loop turns)/wavelength. Which for the single turn untuned circular loop case, can be simplified to; Loop induced emf
There used to be a low frequency arrangement using a 555 timer as a DC-DC converter for charging NICds from a 12 volt supply-was common in the amateur literature maybe 20 years ago. Might be the sort
Any chance of seeing a cct of this, Walter? Info re xfmrs used would be particularly interesting-just to see how they compare to 'local' designs. 73 Dave, ZL3FJ (who has several tube/valve LF txs!) I
From G3PLX: Dave asks how close do you have to be to see anything that isn't exactly on frequency. The answer is 'it depends'. snip -- That sums it up very well Peter, thanks for the reply. 73 Dave,
OK agn, Scott/Murray I had another look at the phasescope pdf file and with an integration time of 300 or so seconds its obvious the effective b/w is waaay down. I guess I was just interested to see
Scott, Murray Fine. Tks for replies. I'm not concerned about the RX stability contribution-that's under control (or should be!) But for non-GPS disciplined TXs I wondered just how good they would hav
Hi Scott Wondering just how close to nominal does the tx have to be maintained to stay 'in view' so to speak? 73 Dave, ZL3FJ -- Original Message -- From: "Scott Tilley" <[email protected]> To: "LWCA
Is VTX3 (India) still running on 18.2-used to be a solid signal here in ZL but not listened down there in a while. ZL3FJ (no 'LF' or 'VLF' ears at present) Markus Only receiving 18.1 here at the mome
Hi Roelof The results of testing with the battery operated SPM-3 may give a clearer picture of what is happening. Your test data appears to show the metallic pole is reducing the effective height of
Disregard the comment about signal strength variation with height, Roelof - I must have had a bad night last night! Of course it will vary with height, regardless of feedline issues - silly me! Inter
Hi Roelof Can you be quite sure the feedline is not contributing to your received signal level? Any variation in strength with height would be a good indication that it is. Interesting to note your p
