Thinking about getting someone a crystal set kit for Christmas? In this video I compare two kits that are available online and at retail outlets. Watch to find out which is the winner. Science Fair kit: https://www.radiomuseum.org/r/radio_shac_science_fair_crystal_rad_2.html Aviosys circuit: https://akizukidenshi.com/download/ds/aviosys/2pk2300_k23_crystal_radio.pdf Cool386 article: https://www.cool386.com/crystal/crystal.html PS: If you liked this video please consider supporting Amateur Radio VK3YE by: * Subscribing on YouTube * Checking my books page at https://books.vk3ye.com​​​​​​​​​​​​​​​​ * Shopping on Amazon via: https://amzn.to/3iiDQXv, or * Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you) ... https://www.youtube.com/watch?v=pRqXy77rDlo

The Btech-APRS-K1 cable provides an easy connection between a Baofeng handheld transceiver and an Android mobile phone. That worked fine from home so the next step was to try some pedestrian mobile APRS on the beach. Did it work? Watch the video to find out. PS: If you'd like to order the APRS-K1 cable you can use the link below. https://www.amazon.com/BTECH-APRS-K1-Interface-APRSDroid-Compatible/dp/B01LMIBAZW/ref=sr_1_1_sspa?keywords=BTECH+APRS-K1&qid=1583150541 ... https://www.youtube.com/watch?v=Q80rjlCnDYM

I only had a short time on Sunday morning to make some contacts during the Summer VHF/UHF Field Day. So I walked to my local beach with the FT817 and 2 element yagi. This video is of an hour's operating. PS: Like these videos? Wish to support this channel? If so please store this link to Amazon Shopping as a bookmark or favourite. https://www.amazon.com/s?k=amateur+radio&camp=1789&creative=9325&linkCode=ur2&linkId=459b07464cb38819b3376396431e47d3&tag=v0108-20&ref=as_li_qf_sp_sr_tl Then when you buy something I receive a small commission (at no extra cost to you). Or check my books page to see if any appeal. http://home.alphalink.com.au/~parkerp/vk3yebooks.htm ... https://www.youtube.com/watch?v=4LcnrklJsI8

A demonstration of the receiver in a 40 metre SSB transceiver. The video starts off with CW signals and then moves up the band for SSB. It is a single conversion superhet with a 10 MHz IF and 3 MHz VFO. The receiver selectivity is determined by a ladder crystal filter while a similar filter suppresses the opposite sideband on transmit. The set uses NE-602s for the mixer and product detector and is similar to many popular designs including VK3XU's TCF. You'll hear several traits that are typical with simple receivers. The first is the image which is heard on the first strong CW signal. While it is partially suppressed (unlike a basic direct conversion set) the rejection still isn't as good as for a commercial transceiver. Then there's the strong signal on SSB which distorts until the gain is backed off. The need to turn it up and down depending on signal strength is because the set lacks an automatic gain control (AGC). Nevertheless the receiver is entirely satisfactory for casual use and will hear just about anything a commercial rig does. The DX station being worked by the ZL is in Indonesia. ... https://www.youtube.com/watch?v=BMLdhl0UdS4