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This is just the basic idea. Credit should go to CBphreaker whos excellent work and kind mentorship brought these mods to light. A.) Disconnect the 10.240MHz signal from the TX mixer. Build a 10.695MHz oscillator and inject this signal into the mixer instead. Add a SPST switch (tied to...

Hello all, I am Considering Operating a CRT Oscilloscope from a Gasoline Generator. Are there any precautions I should be taking to avoid potential E.M./R.F. interference contaminating my signal sample? Would a D.C. battery bank and full sinewave inverter help me in this regard? Would a...

Hello all, I'm looking for a vintage Regency Range Gain II It could be beat up and ugly...

This information is intended for educational (and/or entertainment) purposes only! "How easy is it to unlock the Alpha channels?" Well it is very easy, dare I say "too easy"!! This lovely Cybernet chassis radio has the PTBM092COX PCB, used in several mobiles like the GE 3-5804D, Midland...

Cobra 29 LX Schematic (Included a file named "29 LX LE" with a different file size, but it may be identical.)

Cobra 142 GTL failure to TX / RX Loop Osc counter @ TP1 USB reads 34.75726 LSB reads 34.75724 AM. reads 34.75725 Counter @ TP3: USB reads 7.80248 MHz LSB reads null AM reads null VCO voltage measured @ TP9 1.7 VDC, adjustment of L13 changes nothing. Any insight is greatly appreciated 73

Radio had been through the ringer, changed electrolytic and tantalum capacitors, rebuilt PSU and PA. Everything seems to work ok, though it's one channel low & occasionally won't transmit. I can get to 27.285 by going to Ch. 29 and adjusting clarifier. Now and again the frequency jumps, I...

========================================= Solid State "Ultra Modulation" Series Pass Modulator Inspired by: RevBow's "BME" & CBphreaker's "Wabi-Sabi Mod" written by: LeapFrog 1-1-2020 ========================================= Wideband Audio Modification W/ Controlled...

Hello all, I've made an image with install details for Cobra 29 LTD or Uniden PC-76 radios. it's for the Spectrum Communications FM 455 Mod/De-Mod PCB kit that is used to add F.M. Mode to your A.M. only radio (for Export or HAM use only) I didn't show in the schematic the 8+ Volts sources...

FQP13N10 as the Driver.. FQP13N10 as the Final.. A.M. regulator modification, "wideband capable". VLC player from the P.C. to an outboard audio amplifier. This Cobra 29 LTD belongs to a friend of mine on the west coast. The Bird 43 has a 50 Watts Element, no PEP kit, and yeah it's swangin'. I...

What do you guys think about this antenna? I don't read much into the "specs" ("audio gain") and some values seem off. Besides the marketing and fake or wrong gain figures, what do you think? http://www.gizmotchy.com/Extremegizmotchy.html It almost looks like an 8 element Gizmotchy, an...

OKay.. as the title says the radio wants to smoke (it won't blow a 4 amp fuse) itself when switched into SSB mode, I measured the voltage at the collectors of driver and final, and when I switch the radio to SSB the voltage shunts to ground and the current draw increase, a lot. This is in RX...

Realistic TRC-427 'GoldFinger' Audio Mod Locations for the neophyte RX: C33 = 2.2uF Mylar or Polypropylene C62 = 2.2uF Non-Polar Electrolytics or Mylar C63 = 2.2uF Non-Polar Electrolytics or Mylar C76 = 1,000-2,200uF 25 V Electrolytic D7, D8 = 1N6263 Schottky Diodes Tr2 = "First...

I recently picked up this Varmint XL-1000 amplifier, the transformers are covered in a tar like substance, I hope it's not the varnish from the windings! I even see some wires coated with this gunk/tar! Have you ever seen this kind of gunk before? What do you think? I'm going to try to...

Do we have any R/C car/truck enthusiasts here? I'm sure we have some R/C airplane / heli operators here! The way these batteries/motors are evolving I may ditch the nitro fuel once and for all..

I'm looking to add an external antenna for a small computer/radio, I've found this antenna cable: https://www.ebay.com/itm/2Pcs-IPEX-MHF4-to-RP-SMA-Antenna-Pigtail-NGFF-M-2-WIFI-WLAN-3G-4G-Modules/322627032027?hash=item4b1e11d3db:g:yO8AAOSwaLhZfGl1 My issue is that the cable is not shielded...

How do you feel about radio shoot-out competitions?

I bought a cheap fire starter and wanted to see if my 3$ purchase can perform.. Well, I put my purchase to the test! They work great for the price! (stay prepped, better to be ready than empty-handed if SHTF, water purification and snares help..)

Yes, I am mad as a hatter.. So, what happens if you touch a metal desk while receiving this treatment? RF burns? Are you providing a path for the current to travel to, if you touch bare metal?

Used only in some UK 40 channel sets: Audioline 340/341/345, Tandy TRC2000/ TRC2001/TRC2002, Uniace 100/200 I am looking for at least one of these PLL's, thanks!