Re: [softrock40] A Satisfied Customer
Hi Travis,I am pleased that the RX portion of your 40m/30m RXTXv6.2 is working properly for you.
However, I want to be quick to say that the various circuits in the RXTXv6.2 design came from sources other than me. What I have tried to do with the SoftRock projects is supply low cost kits that the ham community can learn a bit from as well as have some fun with them.
I too am having fun with the projects and I am enjoying using the little receivers and transceivers. For example, a few evenings ago I was able to work Switzerland on 30m CW with the new 20m/30m RXTXv6.2. Not bad for a little less than one watt and a simple wire antenna.
Thanks and 73,
Tony KB9YIG----- Original Message -----From: Travis HardinSent: Wednesday, August 01, 2007 2:43 PMSubject: [softrock40] A Satisfied Customer
After an uphill pull, the receiver portion of my Softrock RxTx v. 6.2
(30M/40M version) is working nicely with the Rocky software, with a
sensitivity of *about* 0.9 μV for a 10 dB SNR (signal/noise ratio) at
I salute the genius of Tony, KB9YIG and the other inventors, for that
great circuit, and the genius of Alex, VE3NEA, for the sophisticated
So last night, not long after first light, I was on the lower end of 40
meters and was seeing a screen stuffed full of signals--mostly CW, but
on the waterfall I saw two DX stations running SSB. I changed the Rocky
mode to SSB for the first time, and one of the signals sounded very
intelligible. It was ER1QQ, Boris, in Moldova. I fired up the station
transceiver and called him up-frequency as he requested. We made the
contact! --and I was thrilled that I made the contact using the virgin
Softrock exclusively as the receiver.
The Softrock selectivity is better than my thousand-dollar Icom
IC-706MkIIg - especially on CW - and its sensitivity, with the good band
condition last night, was nearly as good, but not quite. The best deal
for $31 I ever expect to get!
Now my tale about the uphill pull: I asked a friend who works
professionally assembling PC boards to assemble my Softrock RxTx. I paid
her. She did a beautiful job--I didn't even need to clean off flux. All
the ICs and transistors were placed properly, all the electrolytics and
diodes were properly polarized. There were only two resistors of the
wrong value. It was a good job. But my friend, I learned, has one small
gap in her knowledge--She thought all the little tan through-hole
capacitors were identical and interchangeable.
Consequently the receiver suffered from gross insensitivity because
large-value capacitors put by chance in the antenna circuit were
shorting the RF to ground. Putting in the right capacitors worked tens
of dB's of wonders.
(posted on softrock40@ yahoogroups. com and BCC'ed )