开云体育

Hello Raj, Really -130dBm? It's great! I will try again but I think I'm not able to hear -130dBm with my HP SG. ja9mat

Good news for me! managed to fix my function Seimens generator. One white power bypass smd cap had a neat hole in it! I connected the sig gen and found that I can hear the signal down to -130dbm.

Hi Allard, Thanks for reply and OK I understand all you mentioned. The first code loss will be prevent by using the manual PTT SW to ON. But I feel the main issue is the 1:3 ratio of the morse code

Hi Hidehako-san, The cause of this is that there is a burst of RF which is coming directly through the balanced mixer which is unbalanced for about 60 mS due to the microphone amplifier stage being

OK thanks sarma and Raj, Yes, -117dBm is enough for me.! I only want to know the limitation of this simple receiver's sensitivity. I'm waiting for Raj's measurement result. ja9mat Hidehiko.

Hi Allard, Thanks for your reply quickly. Well I feel the delay is noticed when I start to key the first dot or dash is lost. And I feel the 1:3 ratio is broken during the transmit. Especially the

Thats about 0.3uV, more than enough. On 40M the atmospheric background noise is higher than this. You need a K2 sensitivity when using a poor antenna like a mobile one whose gain will be negative

if still there, I wouzld like one of the sets. Henning Weddig DK5LV Germany Am 03.07.2017 um 17:35 schrieb bellrossjr@...:

Hi Hidehiko-san, Thank you for reporting this issue. The delay you noticed, when exactly is it happening? Is there a problem at the beginning of the transmission (when the radio switches from RX to

comparing to cost of K2, the sensitivity has reached almost the best value, I suppose. sarma vu3zmv -- Regards Sarma

I modified CW mode and set the latest version of firmware(Raduino 1.17.1). I feel distinguished delay when I use the external electronic keyer. The morse code can not follow with keying. How is your

I wonder my BITX has less sensitivity or not. I maesured it about -117dBm using my HP8656B SG. Not reached to 120dBm. My K2 reached to -127dBm. hi... How is your BITX? ja9mat Hidehiko.

I have the PD8W code working here so far just need to connect the VFO to the Bitx and get the LSB/USB change working Adrian

Having looked at the PD8W code for the Bitx40 - (which uses a Si5351 , rotary encoder and a tft display) a few weeks ago and not being able to figure out ?the issue of erratic or no control when

I had " The Art of Electronics", loaned it to a young Engineer! Never got it back! Expensive Book, $60. Kind of an odd book, goes randomly describing circuit design? Useful and interesting. I

Demaw, Goodman, Mccoy were pertinent in their own times and did produce great stuff. One could always visit them for inspiration and nostalgia. the experimental methods in rf design is really the most

I started looking at Hans Summers. Wow, I never saw this before! So much detail! Great Stuff! Mike, WA6ISP -- Mike Hagen, WA6ISP 10917 Bryant Street Yucaipa, Ca. 92399 (909) 918-0058 PayPal ID

Double pole double throw switch To in to out of the agc board * * Audio in * * Audio out

A ton of good information can be found searching the QST archives at ARRL.ORG I've learned so much by reading the articles by hand summers and Rick campbell....now I need to search the other names

Ok I think it woks! I get sound comming from the speaker. How can I confirm that it is doing its job? If something had go wrong with the wiring I suppose I woukd hear nothing I guess. thank you