2012 Facebook memory - Lesser Chirpy

 

This was 11 years ago!  I have no idea where this is now.  It was a tiny 10m CW transceiver. Many  now prefer FT8.

See https://sites.google.com/view/g3xbm4/home/hf-mf-and-lf/homebrew/10m-lesser-chirpy .

One transistor transceiver

My attention was brought to this design yesterday. 

My immediate thoughts were than the TX would be fine, but the RX very deaf. For local QSOs and experiments fine, but it could not be seriously used as the RX would not be able to hear who is on the channel. If the other station TXed first, you would know the channel was clear.

See https://semara.org/tech-talk-a-one-transistor-marvel-transceiver/ .

2m/70cm handhelds

Beofeng handhelds seem to be very popular and inexpensive, although the quality control seems poor: some are fine, whereas others seem "flaky".  

Although hardly ever used, I have Yaesu ( not Trio!! Thank you Keith) VX1 and VX2 dual band handhelds. These we considerably more expensive, but are very small and reliable. Many have found longer antennas are useful. I guess it depends what they are used for.

See https://sites.google.com/view/g3xbm4/home/vhfuhfmicrowaves/vhfuhf-commercial-rigs/yaesu-vx2  .

New radios

Buying a new transceiver here is a big decision for me. 

When I buy one, it is usually kept for many years. I quite fancy the IC-705 as a QRP enthusiast, but it seems expensive. I do not expect the price to drop unless they get real competition.

See https://sites.google.com/site/g3xbmqrp3/new

How do they do it?

 

On Amazon Prime I noticed this UHF (446MHz?) transceiver for £11.95.  Included are a charger and earpiece /mic. 

Another supplier has a pair for just £16.99 a pair.

When I worked at Pye Telecom we would struggle to make the charger for this price! Things have changed a lot in the last 20 years. It must be sheer hell being a UK PMR manufacturer these days. I am sure there are even cheaper ones if you look.

Assuming they ship across the world and make a profit, just how do they do it?

More expensive UK amateur gear?

With the fall in the UK pound as a result of the UK vote to leave the EU it is possible that amateur radio gear (paid for in US dollars) will get more expensive. This is not certain and I hope the dealers will hold or reduce prices and their margins. Fuel will definitely be a bit more expensive.

New portable SDR transceiver

Amateur Radio Weekly reports on a new portable SDR transceiver due out in August this year. Price is expected to be less than $500.

See http://www.qrpblog.com/2016/04/esdr-new-portable-sdr-hf-transceiver.html?utm_source=amateur-radio-weekly&utm_medium=email&utm_campaign=newsletter

Tiny APRS transceiver for PC

This transceiver looks like it should be possible to duplicate. A neat design. I think this connects via a USB socket so the PC acts as a node for digital modes like DSTAR.

See http://unsigned.io/forum/viewtopic.php?id=2

Low cost QRP rigs

There is little doubt that the Elecraft KX3 is the very best QRP radio on the market, but it is very expensive here in the UK. The most popular QRP radio is the FT817 and the price of this has dropped considerably. It is rumoured that an FT817 replacement will be announced at Dayton next year. The IC703 is no longer produced and there is a scarcity of good priced QRP radios in the UK. Yes, there are a few Chinese radios appearing and there are a few QRP radios covering single bands or a very limited number of bands. I find it amazing that ICOM do not propose to market the IC7300 10W version outside of Japan or that the big Japanese companies never tried to produce an FT817 beater. It has taken Yaesu all this time to think about an FT817 successor.

SX-2000 HF (to 4m) QRP transceiver and SunSDR-MB1

This was news to me. I have never seen this before although the post on the website below was earlier this summer.  It looks like a poor man's IC7300 and covers the same range but at QRP power levels. It is an Italian transceiver. Personally I prefer the ICOM. I have no idea about price. It looks like a "back shed job" to me.

See http://www.cqdx.ru/ham/qro-qrp/qrp-hf-transceiver-with-touch-screen/ .

On the same website are details of the Sun SDR-MB1 assembled prototype, which is another rig I have never heard about! There is a video of this at https://youtu.be/SIfvVUw0774 . This rig looks more professional and the YouTube link quotes a price of $5500. This was 3 months ago.

Yaesu FT991 - first price drop

I see that MLS is selling the FT991 this weekend at around £150 discount. I think, with the favourable exchange rate, we will see further drops this year and I expect the price will be £999 or less before the year is out. This is a nice radio with lots of good features and I will almost certainly buy one when the price drops below £1000, but not before.

10m BitX transceiver

I notice that someone has created a 10m (28MHz) version of the BitX transceiver. Yes, all would like more details but we don't know who you are!

Anonymous said:  "I have successfully designed and built a 28MHz version of the BITX transceiver. The main reason for this project was to drive homebrew transverters for 6, 4 and 2Metres. Contact me if you would like details."

Fourbox transceiver

G7CKF's Fourbox

Jenny, G7CKF  has now taken the 2m Fredbox design and created a 4m version called the "Fourbox".

Hi Roger,

    I feel I should drop you a line with my thanks and the link below, I've used your QRP AM transceivers as the basis for a 4M transceiver and published it on my blog. I've come back to amateur radio after a 20 year absence and since construction was always my main interest in the hobby I reached for the soldering iron.
http://thekeywordgeek.blogspot.co.uk/2015/05/a-transceiver-for-not-lot.html
There is no sparkling new insight to be had from it as it's pretty much your fredbox with slightly bigger coils. There is no crystal because I am cheating and using a Raspberry Pi clock generator to make my 70.260MHz.
My QTH is IO91lw, between Bicester and Buckingham and rather low lying. Very little 4M activity hereabouts, sadly, so the chances of my actually working anyone with it are slim. But that's not really the point of building, is it.
Anyway, hope you find it of interest, and thanks again for sharing your designs.

Jenny, G7CKF

Pixie Files

My assembled 40m Pixie

The Pixie is a very simple HF transceiver. Usual power out is in the 200-1000mW region, depending on band and DC power source.  It was first developed some years ago but the basic concept is using a PA transistor as a mixer in a simple direct-conversion receiver. On TX this is used as the TX PA.

Being simple, it has a number of limitations but it certainly works. A major issue can be AM broadcast breakthrough, although my 40m version is perfectly usable. I was very impressed with my little kit that came with all parts including a silk-screened PCB, all sockets and a crystal. It needed low-Z Walkman type headphones, a morse key and battery - that was all. On 40m the sensitivity is pretty good with 0.5uV clearly audible and my RF power out is around 400mW. A lack of both RF and AF RX selectivity is also noticeable.

Kits are available from several sources at prices that are hard to beat. I recently bought a kit for $10 with free airmail from China. It is available for less than half this price I subsequently found out. Unbelievable for a fully functional HF transceiver. Of course, being so simple you may prefer just to build it dead-bug fashion. I bought a kit as I wanted to see how my building skills were.

As a mature design, it has been through several iterations, some improve the basic design, but most do so at the expense of increased complexity. You'd be hard pressed to find a circuit for a complete HF CW transceiver much simpler.

See www.gqrp.com/The_Sprat_Pixie_File.pdf .

SDR transceivers?

Recently I mentioned the 5W SDR transceiver from Italy by Elad which retails for £899 in the UK. This can be used with or without a PC. Clearly with a PC more features are available.

There are several more SDR based transceivers on the market such as the Flex 1500. There are also a few SDR transceiver kits. I wonder if readers have any favourites?

Elad SDR transceiver

From Italy come the news of the Elad SDR transceiver, which was featured in RSGB's RadCom last month. This is being sold in the UK for £899. It is an SDR 5W transceiver covering from 9kHz to 54MHz.  It can be used with or without a PC.  It has 0dBm output at all frequencies and 5W in the amateur bands. Looks a very nice radio.

This image resides on the Elad website and will be removed immediately if copyright is being infringed or having this link is otherwise an issue.

Frog 40m transceiver

This is the Pixie's "big brother". I have mentioned it before in this blog. It has more power than the Pixie and a better RX.  It costs just over £15 with free shipping from Hong Kong. Some suppliers sell it built for this sort of price! This is a real bargain.

I think it uses an NE602, with an attenuator pot in the receiver.

The image is on the eBay page and will be removed immediately if a problem.

See http://www.ebay.co.uk/itm/Frog-Sounds-HAM-Radio-QRP-Kit-Telegraph-CW-Transceiver-Receiver-Radio-Station-V3-/251405614850 .

See also: http://www.ebay.com/bhp/qrp-transceiver for lots of QRP transceiver bargains.

Low cost ASSEMBLED unit from China

This morning, I received this email from Andy Cutland:

Check out this item I found on eBay: it comes ready built and has a nice side tone. Mine arrived today and works fb.

73's
De Andy

End time: 23 Feb 2015 07:21:07

Item: Frogs UltimateV3 version CW transceiver/telegraph/shortwave radio Finish product

URL: http://pages.ebay.com/link/?nav=item.view&id=261576017759&alt=web

Yet more transceiver modules!

A search on eBay has thrown up lots of useful RF transceiver modules, not as low cost as the AM ones found by G6ALB, but nonetheless very low cost and suitable for local communications, Some are 100mW and some 500mW or 1W.  The ones I saw were data units, but these should be suitable for speech  with simple mods. I am unclear how some of these are programmed to the correct frequency. There is usually a choice of either VHF or UHF and I think some are essentially FM.

Put  "UHF transceiver module eBay" into Google to see what comes up. Or try "VHF" instead of UHF. I was amazed how low cost these were.

Micro 40 - 40m DSB transceiver

See http://home.alphalink.com.au/~parkerp/projects/projmicro40.htm .

Also: https://aa7ee.wordpress.com/2013/10/19/the-vk3ye-micro-40-dsb-transceiver/ .

Well designed DSB transceivers are much simpler than SSB rigs as no SSB filters and mixing to final frequency is needed. They must not be over-driven to avoid a spreading signal. The PA needs to be linear too. These issues being carefully considered, you end up with a rig that has the same bandwidth as an AM rig but with a suppressed carrier. DSB transmitters are usually received as an SSB signal. The downside is that if a simple direct-conversion receiver is used then there is no rejection of stations sitting on the other sideband. So, they are best on quieter bands, rather than busy HF bands. Bands like 10m, 6m and 4m are probably good candidates.

Although not impossible, it is quite difficult to demodulate a DSB signal on a simple direct-conversion receiver. DSB rigs are ideal as simple transceivers to communicate with SSB rigs.