Going batty

We are spending a few days with our son and family near Canterbury where he lives in an 18th century cottage not far from the school where he teaches. In the last few months their home has become an hotel for a colony of tiny pipistrelle bats who have taken up residence under the centuries old tiles on the side of the cottage. A bat expert estimated there are at least 300 living there.

This evening, as the light faded, we watched as they  flew out from what appeared like impossibly small gaps in the tiles. Bats are a protected species, so they are not allowed to get rid of them, but apart from their tiny droppings they are not a nuisance. It was quite amazing watching them fly off for food this evening.

IC-7100 UK price: £1249.99 from Martin Lynch

The IC-7100 multi-mode multi-band 100W radio is now available for £1249.99 including VAT from Martin Lynch. Although not yet in stock this is the price advertised, which is some £500 less than I was expecting. Considering it includes all the HF bands, 6, 4, 2 and 70cms this is not bad value. I just hope the touch screen is not tacky and unreliable. See http://www.hamradio.co.uk/amateur-radio-main-equipment-mobile-radio-icom-mobile-radio/icom/icom-ic-7100-pd-5020.php .

New VLF tests from Germany

News from Germany of an upcoming VLF test at 8.970kHz using earth electrodes as the TX antenna with an ultra-stable Spectrum Lab derived signal.

Hello Group,

 

We are planning some VLF-activity at 8970Hz during a meeting of  electronic hobbyists nearby  Kassel / Germany (JO40vr) on this weekend.  The plan is to run a VLF-PA between some ground electrodes. Due to other activities we have no exact time plan, when to start. Depending on internet access i will inform you about the details. 

 

Thanks for looking for our signal in advance.

 

73s

Eike DL3IKE

HF activity - the weakest maximum in 100 years?

Space.com reports that the peak of cycle 24 is likely to be the weakest for 100 years with the next one likely to be even worse. See http://www.space.com/21937-sun-solar-weather-peak-is-weak.html .

Although I venture onto the HF bands every few days usually, I've not found the level of activity, excitement or interest that I had in previous solar cycle peaks. On 10m back in the 1979 peak the band was filled with stations at any time in the day, even outside of contests. There just doesn't seem to be the same level of activity these days? Perhaps it is because having worked over 100 countries with just a few watts, many on SSB, there is, for me, less interest in chasing DX now. Also, I tend to enjoy more creative parts of the hobby whether on VLF, lightbeams, etc. and don't have the time (as much) for HF operating where the competition is often from ill-mannered, QRO stations more interested in their egos than the ham radio spirit.

Crystal Set DX log from 1991

As I clear out my stuff ready for our move, I've discovered my Crystal Set DX Log from 1991, which was 2 sunspot cycle peaks ago. Looking through the entries in the log (all received with a VERY simple shortwave crystal set using a toroid, a germanium diode, a resistor and a crystal earpiece and a longwire antenna about 15-20m long) it is quite astounding how the HF world has changed.

Shortwave Crystal Set DX log - from 1991

For a start, many of the coast radio stations used to transmit in CW on HF and these could often be read due to the cross-modulation from other stations. This was the technique used to detect those shown in the log above.

Also, the shortwave bands were still filled with English language broadcasts. In the few days covered by this log I managed to receive broadcast stations from Cuba, UAE, India and Australia directly (not via relays) as well as plenty of Europeans. Before this date I had no idea that worldwide reception on a crystal set would be possible.

There is no doubt that conditions were very good back in 1991 and I am not so sure that it would be possible to repeat this in 2013, but I would be delighted to hear of success by others with crystal set DXing on HF in more recent times.

I still enjoy crystal sets: they are simple and fun to make yet there is still something unbelievably good about using the electricity from the TXing station to hear them, not my own, especially when the signal comes from very far away.

IC-7100 UK launch July 17th at Martin Lynch

A few hours after I commented on the price in the US of the IC-7100, I had an email from Martin Lynch and Sons announcing the UK launch on July 17th.

There is still no information that I've seen that gives the likely UK price although I doubt one will be in my new shack.

The IC-7100 is bound to cause a lot of excitement as it is one of the first commercial multi-modes to include 4m (70MHz). The press release seems to indicate that D-star will be supported in the standard product i.e. my understanding is this is NOT an optional add-on, but you get it with the basic product you buy.

The pdf leaflet on the IC-7100 is now available.

Weather boots for coax plugs?

I'm looking for what I believe are called "weather boots" to slide over the end of PL259 and BNC coax plugs to help protect them up the mast from water ingress. I guess it is still necessary to add a smear of silicone grease. There are such items for Sky dish F connectors (see eBay item 251296277220) but I have not yet found a source for the common 50 ohm plugs.

Anyone know where such rubber/PVC boots can be obtained please?

2m big wheel antennas on 70cms?

Just wondering if anyone has checked what a horizontally polarised 2m big-wheel antenna looks like (gain, match, directivity, polarisation) on 70cms?

At the new QTH, the most likely antenna on the apex of the bungalow will be a 2m big-wheel (for 2m datamodes, SSB, CW) with a V2000 fitted above it (for 6m Es, 2m and 70cm FM) with suitable spacing between them (>1.3m). It would be useful if the big-wheel behaved well as a half decent horizontal omni on 70cms too so it could be used in UKAC contests.

IC7100 prices

Image at http://www.hamradio.com/images_manuf/H0-011766A.jpg

The new multiband, multimode mobile/base radio from Icom is now available in the USA for $1,824.90 from Ham Radio Outlet store with a 2 year warranty. It is available for $1,664.95 without the extended warranty. See http://www.hamradio.com/detail.cfm?pid=H0-011766.  If importing from the USA don't forget VAT and import duty.

The usual UK price is about the same in pounds as it is in the USA in dollars, so I guess around £1800-1900 is likely to be the going price, although I don't think the UK dealers have them yet.

At the time of writing there are only a couple of reviews of the IC7100 at www.eham.net

Antennas start to come down and wi-fi range tests

Today marked the beginning of the end for amateur radio at the present QTH. We've lived very happily here for 37 years, bringing up our 2 boys and welcoming our 4 grandchildren. Now we are just a few weeks away from our move to the bungalow 300m away up on our local "hill" next to the windmill, the latter currently undergoing a £417k refubishment courtesy of a National Lottery grant. The new home is a nice place and we are looking forward to the move, but it won't be without a few sad moments: closing a chapter in our lives but also opening a new one. The last time we moved, the removal van cost just £11 - it was a LONG time ago, HI.

Today I removed the first part of the antenna system: my 20m spaced earth-electrode wire running in the back garden. Next to come down will be the coax feed from my workshop to the upstairs shack where I operate. The V2000 vertical and the Par 10/20/40 end fed will come down in a few weeks time. I also de-cluttered the bedroom shack to some extent, clearing out all manner of the "I may need this some day" rubbish that fills drawers and cupboards. It is just unbelievable how many SMPSU wall blocks I have that belonged to equipment like routers and scanners long gone. The worst is always the stuff you've kept because, "I may need this one day".  I am trying to be ruthless and give it to a local charity store, recycle centre or the dump if it has not been used, read, looked at for several years. For certain something that goes will be needed next week.

I did a test at the new bungalow tonight on the internet wi-fi coverage: I took my Virgin Media wireless super-hub and set it up (locally, no internet connection) and walked around the new home with my iPod Touch 4g to see how strong the signal was in the shack, bedrooms and garden. Results were promising: I think I may get away without a range extender.