Showing posts with label UK. Show all posts

Happy Pi Day! Scottish Moonbounce in 1965, Eddystone Dials



Somehow this seems appropriate for Pi Day (3-14).  I guess it is because the antenna is circular.
Thanks to David GM4JJJ for sending this to us.  There is no audio. Kind of fun to watch the lads struggle with the big antenna while wearing coats and ties! 
 
David writes:
 
Hi Bill,
    Just watched the video of the progressive receiver and immediately noticed the old Eddystone drive and dial. 
    My first general coverage receiver was an Eddystone 840C in about 1969 I guess, so it brought back fond memories. 
    I also had (much later) an Eddystone 770R VHF receiver, which I used to listen to transatlantic 50MHz on during the sunspot peak a couple of cycles ago now. That was before we were allowed to transmit on 6m over here. 
    Incidentally if you saw the recent film "The Imitation Game" about Alan Turing, you might have spotted the 770R in it, which was actually a mistake as the receiver was not produced until after the war. 
Now something to break your heart, and mine actually:


    This old rig which was given to me sometime in the 70's by another ham, was stored the attic of my previous house now used by my brother, and a couple of years ago I had to clear the attic of the "junk" that I had left when I moved out. I didn't have any more room to store quite a lot of things and I made the decision to take a few things that I never thought I, or anyone else, would need. They went to landfill. :-(
    As you can probably see there is an Eddystone drive and dial driving a VFO which originally had insulation material around it for thermal stability. I think it may have been mixed or multiplied up to 144MHz judging by the scale on the dial. Looking back now I should have tried to save it, but I just felt at the time it would just probably lie in my new attic until I departed and then someone else would have to throw it out.
    I don't know exactly who made it, I was given it by Andy GM3IQL(SK), but I vaguely recall him telling me that it was made by Fraser Shepherd GM3EGW(SK) who I did not know as he died tragically young, but was a brilliant constructor. It could equally possibly have been made by Jimmy Priddy GM3CIG, and I could contact him as he is still around in his 80's now. At least I had the sense to take some photos.
  Now a couple of semi related video material that I put up on YouTube.
This is a (silent 8mm) film made in the 1965s about the first moonbounce attempts from Scotland and Jimmy CIG made the film. My Elmer Harry GM3FYB(SK) is in it. 
Another one this time 1965 field day!
    Bill, I really enjoy SolderSmoke podcasts etc, I am returning to ham radio after about a decade, got the bug again....
    The KX3 is in the shack, and I have the parts here now to build a QRP WSPR beacon by Hans Summers also.
    I like QRP, having previously worked with George GM3OXX back in the 70's when we went out portable with wideband FM QRP 10GHz (3cm) gear using Gunn diode oscillators. Just a few mW and we could work several hundred miles with small 2 foot dish antennas in the right conditions over water by super refraction. The receivers were just mixers, no active RF amplifiers in those days.
I think the best I did was 322km with my 10mW from Scotland to Wales on 10GHz. A couple of decades I built up a real SSB transverter with surplus MOSFETs for 10GHz and with greater power (250mW) and SSB bandwidths I could work non line of sight paths on that band from home. 
    I also like QRO for such things as 2m EME (moonbounce) and am in the course of replacing my old 8877 W6PO design 1500W amp for 144MHz with an Italian manufactured LDMOS 1kW amp that is a fraction of the size and weight, who would have imagined a single solid state device would be able to do that at a price amateurs could afford?
   Anyway enough of my ramblings. 
   Hope you don't mind me taking up so much of your time, I will let you get back to whatever you have on your workbench!
73
David Anderson GM4JJJ
 
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Video of The Moment Colin Made his First Homebrew Contact With Australia



Our British cousins are not a wildly emotional people.  The word "phlegmatic" is sometimes used when describing them.  Stiff upper lip and all that. But as you can see at the 51 second mark in this short video, contacting Australia whilst using a new scratch-built homebrew BITX20 on battery power from a windy English hilltop WILL get those English fists pumping and those thumbs up.  The wind drowns out Colin's voice, but his gestures say it all.  Well done Colin!  Brilliant!  

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Colin's BITX DX From the Field


That has to be one of the best-looking scratch-built homebrew BITX20s.  Pete and I agreed that it looks almost too good to take out into the field.   But that is where Colin took it.  His BITX was designed for Summits on the Air, and the radio gods rewarded him for his efforts with VK DX.  Well done Colin! 
 
 
Hi Bill and Pete.
Well it just worked out that weather was going to be bearable this morning but getting worse through the weekend. I'm really want to ramp up my SOTA score so I'm trying to get out as much as I can. I switched my plans to an early morning activation on one of the local hills. The hill, called Sharp Haw, is a little lump on the edge of the Yorkshire Dales, it's not very high at all, but it is worth 1pt for SOTA.
The early morning time window brought the possibility of VK QSOs via long path on 20m. I looked at the VOACAP prediction for propagation and it suggested a peak at 0800utc.
I was actually late getting up, my alarm clock batteries have decided they've had enough. Despite the late start, I still managed to get on the air by 0725, hearing a strong Australian accent on the power up frequency of the BITX, 14.200, was a good sign.
At 0737, I was called by VK1DI. I had to turn the AF gain up, but sure enough, the signal was workable and we exchanged reports, 55 for him, 33 for me. Within the space of less than 20 minutes, I had 4 VKs logged, the strongest being VK3DET, giving me a 56. The other two stations were VK3CAT and VK2IO. I also worked an Asiatic Russian station amongst others.
I'm over the moon, I might even apply for my SSB thousand miles per watt wallpaper!
I still find it magical that 25 volts into a bit of 7/0.2 wire can transport your voice across 15,000 miles! Amazing!
73, Colin, M1BUU

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Video of Colin's First Contact with his Homebrew Scratch-built BITX20



I love this video.  Colin finished his BITX a week or so ago and has been waiting for an opportunity to test it.  Over the weekend he braved the winter of Northern England and, with his son,  set up his new rig out in his snow-covered garden.   Appropriately for a first contact with scratch-built rig, the circuitry was unencumbered by any kind of case or box.  That's the way it should be done!  Well done Colin!  You are well and truly a member of the International Brotherhood of Electronic Wizards, and the diagnosis of "The Knack" has been confirmed (a severe case, it appears). 

Hi Pete and Bill,
It's been a lovely fine day here in West Yorkshire, so I took a table out into the garden and set up my BITX circuit on it. I set up my SOTA dipole on a 9m fishing pole.
I heard a strong German station calling CQ, so I gave him a call and hoped for the best!
How amazing to contact someone in another country using a rig and mic you've made yourself! Do I qualify as a REAL radio ham now? Do I have a confirmed case of the knack? :-)

Although I may appear underwhelmed in the video, (besides the air punches!), I did really get a kick out of the QSO.
73 and huge thanks to both of you for the encouragement and support.

Colin, M1BUU



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Beagle 2 Found On Mars


I was one of the millions of people who woke up that Christmas morning in 2003  thinking not of Santa Claus but of Colin Pillinger's Mars Lander, the Beagle 2.  We were in London by then, and later on I got to meet Colin Pillinger.  I still have the books about Beagle 2 that he gave to me.   Wow, it looks like they came very close.  Too bad Colin did not live to see these pictures. 

The Planetary Society has a very good article on all this:  

http://www.planetary.org/blogs/emily-lakdawalla/2015/01160800-beagle-2-found.html


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The Battery That's Been Working for 175 Years


In case you missed this.  Makes you think, doesn't it?  I'm thinking of a QRPp QRSS transmitter that would just keep on going.  Battery designed by Giuseppe Zamboni.  

http://motherboard.vice.com/read/this-battery-has-lasted-175-years-and-no-one-knows-how

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Jailed for The Knack: Gerry Wells, Homebrew Hero


Thanks to Thomas of the "SWLing Post" for alerting us to the story of UK radio legend Gerry Wells. As Thomas said in his post, you really need to drop what you are doing and listen to this great BBC program about Gerry: 

http://swling.com/blog/2011/02/radio-documentary-the-wireless-world-of-gerry-wells/

The poor fellow was actually JAILED for his "radio obsession."  Wow.  That was kind of harsh.  But Gerry overcame adversity and had a very happy life in radio.  

Thomas has more on Gerry here: 

http://swling.com/blog/2014/12/jonathans-interviews-with-gerry-wells/

Thanks Thomas!  And thanks to the BBC. 

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Colin Finishes His BITX


Wow, that is one beautiful BITX.  Nicely done Colin.  But I must say that you are exhibiting an almost inhuman degree of patience!  Who needs a case?  Fire that thing up and make the traditional "still-on-the-workbench" initial contact. 

Hi Guys,
I loved the last SolderSmoke, it was another great episode. It really does amaze me, that a few years ago, hams were saying that it was too difficult to build your own gear that would be anywhere near to the commercial stuff, but here we are with Arduinos etc bringing powerful functionality to the masses. I couldn't have imagined building an SSB rig with a pretty and functional LCD screen when I started in ham radio.
Bill, first regens, now SDRs? Amazing! I exchanged a few words with George Dobbs about your change of heart towards regenerative receivers, he seemed genuinely pleased. :)
Pete, your Si5351 work with the pretty displays is cool, I can see me getting pretty hooked! I have the Si5351 board, Paul M0XPD advised me to buy it. I'd love to build another SSB rig in a smaller box for regular SOTA activating. I must look into the pretty little displays and have a play with the Si5351. I notice that Hans Summers has now put out a cheap Si5351 based kit, handy for us guys in Eu. http://www.hanssummers.com/synth.html
I finished building my BITX board yesterday but wanted to have a sleep before applying power! Today I carefully checked the circuit for errors and found none, phew! I fired the rig up gently, watching the current carefully. I wound up the TX bias to 50mA as stated in the MKARS80 instructions, all went well. I plugged in the mic and spoke - BANG! - Everything went off. Oops - I had used a 500mA fuse for initial safety and forgot to swap it for the bigger one! I fitted a 1.6A fuse and hey presto, all was fine. I was absolutely amazed and to be honest, rather proud of myself. I think the TX is a little bit too hot, my meter is showing about 6W on voice peaks- eek! The rig seems to be perfectly behaved though, no wierd effects seem to be happening. I can just turn the bias down a bit, right?
Anyway, I was happy with my progress so I finished for the day. I still need to investigate and probably tweak the carrier suppression.
I spent a short while talking into a dummy load, using my FT817 to monitor the transmission. My 2yr old son was interested in my voice coming out of the 817'sspeaker!
Thanks for all the guidance and help along the way, I'm elated that I've built a voice rig that works! I've attached a pic of my finished board, I only just squeezed the circuit on, but isn't she pretty? :-)
Can't wait to get the rig built into it's case and score that first QSO.
73, Colin, M1BUU


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Nick's BITX


Good Evening Gentlemen,

Pleased to report that, inspired by Pete’s help before Christmas, and innumerable comments by Bill over the last few months, I have a working BitX receiver strip – first light about 30 minutes ago on a short length of random wire but still heard a couple of Italian stations.

Followed Pete’s example and built each stage as a module, I used MePads, having noodled the layout, which is far from optimum, but did mean that I could tinker and, more to the point, test each section before I connected it together, so that starting from the amplifiers (Pete’s design), I was able to test the mixer after a bit of thought and then slowly work my way back through the filter, via the amplifier blocks, DBM, and back to the BP filter … Came together surprisingly quickly working as you suggested Pete, and nice manageable chunks too. I think about 2 hours for each module to noodle the layout, test it and document what I’d done.

Still lots to do, using a semi commercial BP for now as I need some bits that I’ve ordered to build a homebrew BP filter, the crystal filter isn’t optimised and just uses Fahran's suggested values, nothing is properly tweaked so far, but, it does work – thanks guys !!

I’ll follows Fahran's suggestion and tinker with it on rx for now, might build a VFO so it’s ALL discrete devices. Currently all 2n3904s except for the 2n3906 in the audio stage, and of course the Chinese DDS with an Arduino so I have followed the path that Bill set out a while back – it’s a little deaf against my FRG7 so far but tweaking the filter to match the impedances a little better will probably help, and the filter has a lot of ripple.

Next stage will be to build a microphone amp and test it on the Tx side, then tackle a small linear amplifier for it, I’ll stick to around 5 watts for now, and inevitably, I can see it being tinkered with in the course of time.

VERY pleased – thank you both for your help and inspiration

73s

Nick, G8INE



Hi Nick,
 
Congratulations – very nice looking and the other bonus of building it large the 1st time through is when you build the 2nd one –you 1) know the circuit works and 2) you can optimize the layout. I frequently said that I often build two of the same, learning from the 1st and applying to the second. See below. Version 1 was a larger board in comparison to the whole radio in version 2.
 
Bravo – in short order you should be making lots of QSO’s
 
Pete N6QW


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Colin Gets His BITX Receiver Going

Pete and I congratulated Colin on the First Sigs heard by his BITX (sort of like First Light for a telescope.)  He is clearly following the advice offered by Farhan in the original BITX20 article:  Take a break when the receiver is done; sit back to enjoy the sounds of success.  I told Colin that having a small error in the build, then finding it and fixing it, well, that's icing on the cake OM.   This also shows the benefit of having an oscilloscope. Here is Colin's report:
Hi Pete and Bill,
I really enjoyed the latest SolderSmoke! I think you two have got a winning formula, humour interspersed with valuable technical knowledge. Some podcasts are just too serious, there's nothing wrong with having fun in your hobby!
Progress is slow here, as always, but each week I have managed to move a little bit further forward. This week I aligned my BITX band pass filter and made a rough measurement of my crystal filter using the DDS signal generator that I built last week.
My oscilloscope is a Tektronix 465, older than me I believe! Of course there is no fancy signal level readout like the modern digital scopes, so I had to just peak the injected signal through the crystal filter and measure the frequency using a frequency counter connected to the IF amp. I followed the BITX ver 3 build instructions and my results seemed to match very closely to the Indian kit. I'm going to set my BFO at the -20dB from peak level as suggested in the ver3 instructions, I guess I can fine tune the setting later.
At first I had no signal making it out of the last RX IF amp, I traced the signal right through to the base of the first transistor but then the signal was lost. I had thought that band conditions were poor when I tried my BITX in RX last week when in fact it turns out that I'd made a small mistake building the IF amplifier that follows the crystal filter! I had wired the 4k7 resistor in the wrong place! I made the circuit good and hey presto, lots of signal coming out of the amp!
I was eager to give the receiver another try. On Fridays work finishes at 1pm, so a great chance to try out my rig during daylight hours. I hooked up the rig to a random piece of wire and I was amazed by the great noises coming from the speaker! I hadn't even set the BFO but voices were just leaping out. Man that rig has a lot of AF gain! I obtained a switched 10k log pot which I intend to use for power on and AF gain so hopefully the volume control will be OK. As a side note, it was nice to hear HF0YOTA down in the CW portion, I'm guessing that it is youngsters on the air station, I must do a search on the call later.
73, Colin M1BUU
So the little signal generator has already earned it's keep. I guess I can would have been scratching my head for a while without it!

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Graham G4UEK has THE KNACK



Thanks to Stephen for alerting me to the homebrew page of Graham G4UEK:

http://www.sandrock.org.uk/radiostuff/Rigs.htm

I really liked the description of his progress as a homebrewer, and the way he was helped by G-QRP, SPRAT and Ian G3ROO.  FB.

Graham has a nice personal ham radio story:

http://www.sandrock.org.uk/radiostuff/Radio.htm

Thanks Stephen!  Thanks Graham!   

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Colin's BITX is Receiving!


Wow, quite a bit of progress at M1BUU since our last look (see below).  I must admit, that Arduino DDS board looks quite nice sitting there in the VFO territory.  In his original BITX20 article Farhan recommends a pause before the construction of the final portions of the transmitter -- the builder is advised to sit back and enjoy the receiver that has just been created.  Colin is at that point!   Congratulations Colin.  He has noted that his board is a bit(x) smaller than mine.  Maybe he should stick with Farhan's recommendation and build the PA and driver on a separate board.  This will also help prevent the dreaded oscillations -- no need to tempt fate or anger the radio gods! 

Hi Pete,
Another great SolderSmoke episode this weekend, I really like the humour between you and Bill! I listened to SS whilst melting solder on my BITX project.
I had really wanted to get my BITX working as a receiver before the end of the weekend, but Lewis Hamilton and his (successful) bid to become Formula 1 World Champion, put an end to that idea! I also decided that I wanted to buy some better quality capacitors for the band pass filter, so I've ordered them today.
I fired up the receiver chain for the first time this evening from where the BPF should be, right through to the AF amp, I'm pleased to report that I seem to have created a working superhet receiver! I heard some BC breakthrough at certain points of the tuning range and the rig receives the second harmonic of my Rishworth Buildathon 40m transmitter beautifully (on right part of dial too!). I hadn't tested the RX IF amps or AF amp before, but they seem to be doing just fine.
I'm so pleased to have got so far, and I'm very pleased with the build. That big copper clad board doesn't look so big now, but I think I have room for the TX/RX switch, BPF, RF driver, RF PA and LPF which I still need to add.
Thanks for the encouragement and advice so far, I doubt I'd be feeling so elated at this point without it!
This is going to be a really cool rig!
73, Colin M1BUU

Hi Colin,
 
Two words come to mind: Absolutely Superb! Wow that is such a work of art. I may never show another one of my projects as you have set the standard and benchmark.
 
You also have demonstrated building from the back end which we discussed in SS168. Now what you have built is a part of the test system.
 
Really outstanding. Be sure and video your 1st qso and share on You Tube.
 
Bravo!
 
73’s
Pete


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Colin's BITX


With advice and tribal knowledge from N6QW and MeSquares from W1REX, Colin M1BUU, is making excellent progress on his BITX.  I see that he has some territory on the board reserved for a DDS VFO.  That's fine, but here's and idea for Colin and other builders:  Why not build it with the standard VFO first and then add the DDS or Si570 VFO later, perhaps as an external accessory?   That way you get the experience of building an LC VFO -- the full BITX experience. 

Yea, it is hard to imagine Paul M0XPD as a newcomer to the hobby such a short time ago -- he is definitely now in the ranks of the esteemed digital Elmers.   

And yes Colin, we do hope you avoid unwanted oscillations.  Because of Farhan's great design you have a good shot at avoiding this plague.  But be prepared OM.  It happens to the best of us.  A lot.   Stiff upper lip!  Never give in!  

*************

Hi Bill,
I enjoyed your video about your Arduino experiment. You bet me to it! I'm really looking forward to getting my version of an Arduino powered BITX up and running.
Steady progress is being made, yesterday I added my first bidirectional amplifier to the build. I now have the mic amp, BFO, balanced modulator and first amp completed. I tested the BFO on it's own and got a respectable looking signal out of it and with a good swing below 10MHz.
Next I need to add the crystal filter, second IF amp and mixer. Pete's video will help for the mixer! BTW, I'm using the ver3 schematic but I intend to use the ver1 band pass filter.
I set out building the circuit following the N2CQR layout diagram but I've already run short on space! I do have a good excuse though, my board is smaller than yours (10"x6").
Despite my best intentions, I'm falling back towards old habits of making my circuits physically small. I'm using MeSquares in order to try and force myself to space things out a bit. I do hope that I don't end up with any unwanted coupling!
I must try hard to leave lots of space between the next bits of circuit.
I was listening to SolderSmoke 104 today and Paul M0XPD was introduced as a new ham. Little did we know that Paul would become such a big player!
73, Colin M1BUU

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SW Echo Theory Confirmed By a BBC Engineer

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SolderSmoke Interview on ICQ Podcast


Colin and Martin of the ICQ Podcast were kind enough to invite me in for an interview.  I really enjoyed our talk.  We covered a lot of ground, everything from podcast history, to regens and BITXs and Arduinos.  I think SolderSmoke podcast listeners will enjoy this.  Thanks Martin!  Thanks Colin!  Here it is:

http://icqpodcast.com/download-the-show/2014/9/7/series-seven-episode-eighteen-bill-meara-n2cqr-07-september-2014


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Regen Madness






Dave, AA7EE, has a really nice blog article about his experiences with regen receivers.  He writes about a regen kit he built as a kid (pictured above) and goes on to describe in beautiful detail a regen he built recently using a combination of old tech and new tech:
http://aa7ee.wordpress.com/2014/08/21/the-sproutie-a-general-coverage-regen-receiver-with-plug-in-coils/

I agree with Dave when he notes that regens are unfairly thought of as mere novelties. My old "King's Speech" regen (below) is a very useful shortwave listening  receiver and could easily be used for 40 meter CW contacts.  It is even stable enough for SSB.   



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Seized up Variable Capacitor -- Any ideas?


Perhaps in retaliation for all the bad things I've said about regens over the years, the main tuning cap in the old regen I've been working on suddenly went from completely loose to totally stiff.  I can turn it, but it is too tight for the old vernier drive in the regen.  I have replaced it with another cap, but this part was kind of the star of the show, situated as it was several inches above the chassis, connected to the tuning control by a long shaft.   I've tried squirting WD-40 in there -- no joy.  I can't even figure out how to open up the part of the cap where the ball bearings should be. It is an OLD Eddystone from England.   Any ideas? 




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Video: Regenerative Receiver Project!!!



Pete Juliano and Grayson Evans are luring me back into the world of tubes and (gasp!) regen receivers.  

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M0XPD Goes 3D with Boxed BITX with Digi-Hinge!


Paul, MOXPD, has put his BITX-based rig in a proper box.  In spite of his recent collaboration with famed miniturizer Pete Juliano, Paul used a BIG box.  It is not quite milk carton size, but it is getting there. Well done Paul.   I really like the way Paul kept the digital and analog elements in different dimensions.  The digi bit is sort of floating above the main analog board (almost in a "cloud"!).  In SolderSmoke 163 Pete Juliano mentioned a downside of this kind of stacking:  it makes it hard to get to the main board.  Paul ingeniously solved this problem by putting the digital board on a hinge.  Excellent.  This will prevent you from becoming "unhinged" when the time comes to fix or modify the main board.    

Here are all the details on Paul's project: 
http://m0xpd.blogspot.co.uk/2014/07/boxing-clever.html


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I Wrote Another Book


This one is not about radio or electronics, but over the years many SolderSmoke listeners have written in saying that they liked the opening "travelogue" portion of the podcast.   This book may appeal to them.  It might also be of interest to spouses who've been hearing about these "soldersmoke people."  This would be, I think, a good "beach book." 

The title is:  "Us and Them -- An American Family Spends Ten Years with Foreigners"

 Here's the description:

What happens if you take an American family and send them to Europe for ten years? In the summer of 2000, Bill and Elisa Meara, accompanied by 2 year-old Billy and 4 month-old Maria, left their home in the suburbs of Washington, D.C. and moved to the Azores. There they experienced the highs and lows of diplomatic life on a small distant island. After three years in the Azores, they spent four years London and three years in Rome. Overseas they lived in two houses and two apartments, went to five schools, used four different health care systems, experienced one earthquake, 9-11, the terrorist attack on London, tea with the Queen, the election of Barack Obama… and all the ordinary things that families go through. They lived mostly with the locals, learned Portuguese, Italian, and a bit of Cockney, and made many friends (foreign friends!) They returned to the United States in 2010 with a changed view of the world. This is their story.

In print form is available from Amazon and from Lulu:

AMAZONhttp://www.amazon.com/Us-Them-American-Family-Foreigners/dp/1499286287/ref=sr_1_2?s=books&ie=UTF8&qid=1403693380&sr=1-2&keywords=meara+us+and+them

LULU: http://www.lulu.com/shop/bill-meara/us-and-them-an-american-family/paperback/product-21687240.html

And it is available in e-book form from
AMAZON KINDLE:
http://www.amazon.com/Us-Them-American-Family-FOREIGNERS-ebook/dp/B00L8DR4RK/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1403653620&sr=1-2&keywords=us+and+them

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