Thanks, I found only Yaesu FT-747 but are looking the Sommerkamp 747 from early -70 (or late -60). 73 Erkki - Original Message - From: 'Tim Moes' To: 'Erkki Latomaa'; Sent: Tuesday, June 07, 2005 10:09 PM Subject: Re: Yaesu Soka 747 Hi ErkkiThe Yaesu FT-747 should be the same and you can find it at www.mods.dk.
When you bring up the site click on the manuals on the right side of page to bring up list of manuals. There is a technical supplement available for download. This is a great reference site. Tim Tim Moes wd0fkc www-midwest-technical.com - Original Message - From: 'Erkki Latomaa' To: Sent: Tuesday, June 07, 2005 1:09 PM Subject: Yaesu Soka 747 I'm looking for scematic diagram or a service manual for my new(?) radiothe Sommerkamp 747. Thanks in advance for any tip! Erkki / SM5NBE Yaesu mailing list [email protected] Yaesu mailing list [email protected].
The picture below shows the the 2m/70cm ham radio HTs I own at this point. Click for larger image. Icom IC-U82. Icom IC-T3H. Yaesu VX-170. Yaesu VX-177.
Prova del valvolare Sommerkamp Soka 747. This feature is not available right now. Please try again later. Thanks, I found only Yaesu FT-747 but are looking the Sommerkamp 747 from early -70 (or late -60). 73 Erkki ----- Original Message ----- From: 'Tim Moes' To: 'Erkki Latomaa'; Sent: Tuesday, June 07, 2005 10:09 PM Subject: Re: [Yaesu] Soka 747 > Hi Erkki, > > The Yaesu FT-747 should.
Quansheng TG-UV2. Wouxun KG-UVD6P (just in, to be compared with the KG-UV-D1P). Waccom WUV-6R. Wouxun KG-UVD1P. Baofeng UV-B5. Puxing PX-888K. FM Transceiver 708 (my first ever Chinese radio, total crap).
Feidaxin (FDC) FD-268A (the FD-268B died recently). Alinco DJ-S40 (In need of keypad repair). Baofeng UV-5R (BFB239), Camo.
Baofeng UV-5R (BFB231). Baofeng UV-3R. Baofeng UV-3R Mark II Camo. Tianyi TY-100. Baofeng BF-666S. Baofeng UV-3R (2nd sample) Not included: CB/10 meters, 70MHz, FRS/GMRS, PMR/LPD. Adding these would about double the number of HTs currently owned.
Not long ago I downgraded my phone. I still think it was the best decision ever, when taking the specific function of that phone into account. The Acer smartphone I owned before had a terrible battery life. Which made it unreliable.
The Windows OS made it even more unreliable and painfully slow. When my mother fell ill, I really needed a phone capable of being standby for days or weeks in a row without constant recharging. The Nokia 100 does exactly that.
Yet I missed checking mail while on the road, amongst other things. How about two phones and an extra SIM card? Being a fan of Android, I started to look around.
I don’t like small screens, so everything under 4.7 inch was skipped. Small screens are hard to read and hard to type on. Surfing the WWW isn’t comfortable either.
Almost automatically you end up looking at Samsung Galaxy models. When I saw the prices though, a slightly modified Star Wars line popped up in my head: “These aren’t the Androids you’re looking for. Move along.” Made In China – a risky decision In the end I ordered a Chinese Samsung look-a-like for under $99 found on eBay. Maybe it will prove to be the biggest mistake ever, I don’t know. I did look for reviews before ordering though. There are quite a lot of them and to my surprise most were favorable. Sure, specifications lag behind on almost all counts when compared to a Samsung, but other than that no major problems were reported.
Even Google’s Play Store is officially supported, something many earlier Chinese Android phones lacked. The phone will take a while to arrive, especially with the Chinese New Year celebrations in sight. I’ll keep you informed (if anyone cares, after all this is a ham radio blog.).
The AM/MW Period Years later I learned that I was not the only one at that age who discovered that a simple transistor radio could transmit too. The system was simple: tune the radio 455KHz lower than the place on the dial you wanted to be heard. At first the range was pathetic, maybe one meter or so. I also had no clue how the modulate the thing. I didn’t have a clue about anything, for that matter. What I did to improve the range was taking a long piece of wire and touch all the solder islands on the PCB until I noticed a sudden improvement of signal strength. That worked, my range became somewhat reasonable (± 10 meters), and I started to think about a way to talk through the radio.
I had absolutely no idea where to start, but the fact that I needed a microphone was clear. I stole the from my parent’s telephone. I was a thief. From this point on my memory fails. I got it to work, but can’t really remember how. Let’s keep it on a combination of instinct, a total lack of knowledge and a lot of luck.
Anyway, the neighbors could listen in, my father couldn’t believe his eyes and ears, my mother shook her head, and I was hooked. I Need More Power! You guessed it: I wasn’t satisfied with the range and started to look around for someone who could help me out. I found an Elmer.
He started to explain the basics to me, and helped me to construct my first decent Medium Wave transmitter, based on the and the Amroh 402 coil. This was famous stuff at the time, and Amroh was the biggest name in electronic parts here.
Together with my friend Joop (now PA1KC) we salvaged defective tube radios which had been dumped by their former owners. The frames were extremely valuable to us, and the amount of still usable tubes, transformers and capacitors was staggering. Remember, we didn’t have a cent to spend! The schematics of the 5 Watt transmitter we built looked something like this: Now this was fun; under the right circumstances my signal could be heard in the UK.
Actually, one of my friends was caught because of complaints from UK authorities! He played music for many hours in a row, which made locating him fairly easy. I didn’t play music, I only made QSO’s. I never liked to play radio station. The CB Period I also became interested in CB. There weren’t any mobile radios available at that time, only 1 or 2 channel 100mW (input!) Walkie Talkies. Range only became somewhat reasonable when you took the thing apart, removed the 9 Volt battery, connected a 12 Volt power supply, removed the antenna and connected the radio to a ¼ λ ground plane.
Later the first 6-channel CB radio entered my shack, a Sharp. I had a lot of fun with that radio, but it wasn’t very reliable. One of the IF transistors was very sensitive to statics and failed numerous times, even a thunderstorm 10 miles away was enough to kill it. In the end I dumped the radio, because the PCB was completely messed up after all the repairs.
The Sharp was eventually replaced by the 23-channel Cuna 1, better known as Tenko H21/4. I loved that radio. Much later I replaced it with a Superstar 2000.
While CB was a great place to be at that time, I also started to focus on ham radio bands. I built a few 2 meter transmitters, combined with a Cuna SR-9 receiver. I still had no license, but never ran into trouble. Most ham radio operators never noticed that I was a pirate, and the few who knew argued it was acceptable because I was building stuff and behaved like everyone else. Two of them, Leo PA0LEZ and Roef PA0RLV (†) had a great influence on the rest of my ham life.
The FM Period The FM band was a great band too at that time. There were only a limited number of official stations, above 100MHz the band was virtually empty. The designs varied, as did the power output. From just one Watt to about 50 Watts, stereo or mono, and verticals to 5-element Yagis.
I earned quite a bit of money building and repairing FM transmitters for other people. There’s a Dutch website documenting all FM pirates of that time. Eventually these guys too, including a picture of my old QSL card. The HF Period I also added HF to my bag of tricks when I was able to get my hands on a Sommerkamp SOKA 747. Years of unlicensed operating on every frequency imaginable went by without incidents, but at some point in time it became clear that the authorities were right on my tail. I sold everything and tried to be invisible for a while.
Eventually I got my license in 1979 and started all over again. Is this story complete and 100% accurate? This story is littered with gaps and overlaps. I played with way more transceivers and frequencies than would fit in one blog post. I left them out because they are minor dots plotted on the time line. By Posted in, Tagged. A few days ago I noticed some incoming traffic from a Dutch scanner forum.
I could read there without registering, which made life easy. The link provided there was about the Baofeng UV-B5 review, but I also noticed something else interesting in the thread. One of the forum members did some measurements on the UV-5R, stating that the radio was totally crap due to excessive spurious emissions and harmonics. He added a screen shot of his Rigol spectrum analyzer, probably the same model I own. This was what he came up with: If this were correct, the Baofeng UV-5R would be the most horrible design ever. But wait, already a long time ago, and the UV-5R wasn’t too bad at all. All of his bothered me enough to pick up a few of my own UV-5R’s and repeat the measurements.
I tried the oldest one I have (BFB231), and a more recent one (BFB239). Results didn’t differ in any way, so I just picked one.
These were the results. UHF: 54 dBm Down So, what’s happening here? I considered a few possibilities: 1) his UV-5R was a dud, 2) he made errors while measuring. The answer is likely #2. The only way I could replicate his results was by reducing external attenuation to such a low level that the linearity of the spectrum analyzer was compromised.
Higher order harmonics I’m pretty sure his faulty results were caused by a well-known factor: distortion due to higher order harmonics. When the input signal level you feed into a spectrum analyzer is (too) high, spurious images of the input signal harmonics are generated due to the non-linearity of the mixer conversion. It’s kinda like LSD to a junk; you start seeing things which aren’t there. Bottom line: it’s easy to make any HT look bad by not understanding the test equipment you’re working with. By Posted in,.