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eHam Forums / HomeBrew / 40m DC receiver
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on: October 28, 2008, 03:28:02 PM
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Thanks for the reply.
Yeah, That is my rule of thumb. If the moise level increases when the antenna is connected, then a preamp is not required. because this wasnt my case with this particular receiver(!), I was wonderig whether a preamp was good.
Thanks a lot
Regards,
73 de va7aax
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eHam Forums / HomeBrew / 40m DC receiver
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on: October 21, 2008, 04:09:17 PM
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I built the receiver side of the funster transceiver http://www.qrp.pops.net/funster.asp (link) I just have the T50-2 4t : 39t with 68pF as shown as the filter. Now I am using a 7031 KHz xtal. But I want it to be a VXO. So should I put a small (10-70) variable cap where the 68pf || 10pf cap below the xtal ? also would the VE7GC pre amp be a good aide to this rcvr? http://www.qrp.pops.net/preamp.asp (preamp link, scroll down a bit to see the design)
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eHam Forums / HomeBrew / Any uses for this toroid?
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on: June 02, 2008, 03:30:26 PM
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one example would be the microR2 series by KK7B in January 1993 QST. It used the 88mH coils in the audio filter.
I think the Binaural receiver also uses these.
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eHam Forums / HomeBrew / Looking for a 500-800pf variable capacitor
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on: March 17, 2008, 08:20:03 AM
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Check local hamfests and remember to put the message out in your club.I am sure somebody will have it.It will probably cost $20 or so new.Google "Nebraska Surplus Sales" and "Cardwell Condensers" and "Fair Radio Sales".
these might have what you need
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eHam Forums / HomeBrew / Variable Capacitor Pinout
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on: March 07, 2008, 02:34:01 PM
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If i remember correctly, there are 3 leads sticking out,
Now if you hold it with the leads facing AWAY from you, the middle one is ground, the left lead would be 0-60pF, and the extreme right one would be 0-160pF.
73 de va7aax
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eHam Forums / Youth / So why do you ham?
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on: September 28, 2007, 09:04:06 PM
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i have had my licence over a year. i checked into a few nets but the thing that appeals to me MOST is HOMEBREWING/QRP. i just love when u make a contact on equpment u built urself
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eHam Forums / Elmers / VHF rigs
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on: January 28, 2007, 06:48:22 PM
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i am looking for VHF SSB and CW rigs . want to be on he cheap side . any suggestion?
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eHam Forums / Elmers / why build a yagi?
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on: January 25, 2007, 10:30:11 PM
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i spent 80$ on buildin a radio even when there was a persn offering onne for 40$.i dont regret itcause i learned a lot
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