Search found 125 matches

by Animal
Wednesday 14th Jan 2015, 4:27
Forum: CB Antenna Systems
Topic: SWR Problems
Replies: 1
Views: 3844

Re: SWR Problems

:shock:

The best antenna is one that is resonant on the frequency you want to TX/RX on and that suits your requirements (mobile, base, directional, compact, etc etc etc ?)

:roll:
by Animal
Tuesday 13th Jan 2015, 8:32
Forum: CB Antenna Systems
Topic: Made In the USA - SigmaIV ;)
Replies: 14
Views: 6601

Re: Made In the USA - SigmaIV ;)

Bit late with the reply :oops: but I found some pics of a four element quad mid build and some of the four element loop driven yagi hoisted aloft! http://i1117.photobucket.com/albums/k593/swoodcock1/Quad3_zps0e55f344.jpg http://i1117.photobucket.com/albums/k593/swoodcock1/IMG00028_zps8a13b8da.jpg ht...
by Animal
Sunday 22nd Apr 2012, 3:16
Forum: CB Antenna Systems
Topic: Made In the USA - SigmaIV ;)
Replies: 14
Views: 6601

Re: Made In the USA - SigmaIV ;)

Great job HomerBB =D>

I had an Avanti Sigma IV back in the day (circa 1980) & worked the world on 12w ssb

Last home-brew for me was a four-element loop driven array - I'll post some pictures when I get time.

Keep up the good work :dance:
by Animal
Monday 16th Apr 2012, 7:33
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 5231

Re: President Grant,Clarifier slide

Hammer sorted - just need the anvil! :wink:

Did you ever manage to perfect that mod for 5kc steps on the Grant by the way - seemed like much better idea than fiddling around with the clarifier & a frequency counter to get the zero's :idea:
by Animal
Sunday 15th Apr 2012, 7:07
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 5231

Re: President Grant,Clarifier slide

Quite correct Dave - glad you're paying attention at the back! =D> You'll find that the extra inductance will also give you more downward shift than up & you'll need to reset the VCO offsets (& probably find that you can't align it correctly with the Coarse control in the center notch position!) Tim...
by Animal
Friday 13th Apr 2012, 6:45
Forum: CB Radio Modifications
Topic: President Grant,Clarifier slide
Replies: 7
Views: 5231

Re: President Grant,Clarifier slide

This reply is obviously a bit late but may help someone else. :doh:

Try adding a 5.6uH coil in series to 0v end of the varactor diodes :idea:
by Animal
Friday 18th Jun 2010, 18:56
Forum: CB Radio Modifications
Topic: K40 microphone
Replies: 7
Views: 5476

Re: K40 microphone

Thanks for the additional info Norm It's working very well but I can hear a very slight buzz (which stops when I touch the mic plug) on another receiver :| The other thing I noticed is a trimmer inside the mic (not the gain control which can be adjusted via a hole in the back of the mic) Anyone shed...
by Animal
Saturday 29th May 2010, 20:08
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

No Dave,

Checked the voltages & all seemed to be in order.

I've ordered some of those large cap varicap diodes (25-500pF) & will let you know how I get on.

Steve
by Animal
Wednesday 26th May 2010, 21:19
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

It's the black front version Dave (with both coarse & fine) but the coarse only moves 2kc either way. :?
by Animal
Tuesday 25th May 2010, 19:23
Forum: CB Radio Modifications
Topic: K40 microphone
Replies: 7
Views: 5476

Re: K40 microphone

Cheers Dave

I tried it last night without the mod & the charge from the capacitor died after about five seconds! :shock:

CQ DX CQ DX CQ DX CQ DX .....................snooze
by Animal
Tuesday 25th May 2010, 19:17
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

zodiac wrote:Steve,
D44 is for Mid and Hi bands, you have unlocked the clarifier haven't you ?.
Dave.

I didn't realize it needed unlocking tbh Dave :?

How do I do that exactly (I have my claw-hammer & oxy-acetylene torch at the ready!)

Cheers

Steve
by Animal
Tuesday 25th May 2010, 3:31
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

That's because they are, I said D1 is on the crystal board, I didn't say D4 was as well. Dave. That's me on the naughty step (again!) :oops: Okay, swapped D1 from the Xtal board on the Concorde into the Grant (D44 position) & it's just the same (all three bands) I know that one diode is used for tw...
by Animal
Tuesday 25th May 2010, 3:09
Forum: CB Radio Modifications
Topic: K40 microphone
Replies: 7
Views: 5476

K40 microphone

I've just got a K40 compression microphone & was thinking of wiring it up to the Cobra 148 GTL-DX Will the voltage of the switching line (approx. 3.6v on my Cobra) be enough to charge the capacitor inside the mic? I seem to remember some sort of 'power conversion' kit being supplied with the origina...
by Animal
Saturday 22nd May 2010, 1:08
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

Dave,

On the Xtal board of the Concorde 2, D1 & D4 look totally different to each other?

Steve
by Animal
Tuesday 18th May 2010, 4:18
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

That's normal Steve, you have to change both the varactor diodes D40 and D44 one for each crystal to get it to shift further for the same as what's in the Cobra 148GTL DX MK2 MV201, have you got a scrap 148, if so then shame on you. You can also use two ITT410 out of a scrap Cybernet radio and that...
by Animal
Tuesday 11th May 2010, 17:56
Forum: CB Radio Repair and Troubleshooting
Topic: Ham International Jumbo Offset Freq. problems
Replies: 5
Views: 3470

Re: Ham International Jumbo Offset Freq. problems

I had a similar problem with a Cobra 148 It had been modified to cover extra frequencies & one of the diodes had gone - no matter how far I adjusted the pots I couldn't reach the offset frequency :doh: You didn't say if your Jumbo is modified but maybe worth checking out before starting to look at t...
by Animal
Thursday 6th May 2010, 4:42
Forum: CB Radio Modifications
Topic: MC145151 PLL
Replies: 15
Views: 9752

Re: MC145151 PLL

zodiac wrote:What MOD Steve ?.
Dave - It's a great idea using the MC145151 to get 5kc steps rather than waiting for someone to call on the zero's then calling them back!

Would it tune continuously or would it still need a 10kc shift added to get the alpha's?

Steve
by Animal
Thursday 6th May 2010, 4:32
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

Re: President Grant - Clarifier Shift

Cheers Dave,

Scrap Cobra 148's - perish the thought!!! :shock:

I've got a RD16HHF1 MOFET (sealed in anti-static package) if you want to do a swap for some varactor diodes? :?

Steve
by Animal
Wednesday 5th May 2010, 21:02
Forum: CB Radio Modifications
Topic: MC145151 PLL
Replies: 15
Views: 9752

Re: MC145151 PLL

Dave

I wouldn't mind this mod doing to a President Grant (PC-999AE)

Will it still need a +10kHz shift adding (it's standard at the moment) or does it step 5kHz continuously after the mod?

Cheers

Steve
by Animal
Wednesday 5th May 2010, 20:41
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 7220

President Grant - Clarifier Shift

Radio Make and Model: President Grant (Black Front) PCB Number: PC999AE PLL Number: Test gear available: Stand Alone Counter, Digital VOM Symptoms: Coarse clarifier control doesn't shift 5kc either side. What is working: Everything else works fine. What has been tried: Nothing (I'm just a keen hobby...
by Animal
Thursday 1st Apr 2010, 7:35
Forum: CB Radio Repair and Troubleshooting
Topic: Audio 'gargle'
Replies: 7
Views: 3521

Re: Audio 'gargle'

Dave/Ray I checked TP2 voltage on Hi band (Ch40 AM mode) & it was 7.4v I adjusted L18 for 5.4v (Hi Band CH20 AM Mode) & base voltage has dropped to 7.1v Re-checked final & driver bias (both within spec at 51ma) Hope I'm going in the right direction??? Sounds okay on my other receiver (but I've had a...
by Animal
Wednesday 31st Mar 2010, 1:21
Forum: CB Radio Repair and Troubleshooting
Topic: Audio 'gargle'
Replies: 7
Views: 3521

Re: Audio 'gargle'

Dave

Checked driver & final base (mike gain fully anticlockwise on SSB) & I get 0.73v & 0.69v on TX

Steve
by Animal
Sunday 28th Mar 2010, 20:10
Forum: CB Radio Repair and Troubleshooting
Topic: Audio 'gargle'
Replies: 7
Views: 3521

Re: Audio 'gargle'

Checked screws - all tight & solder tabs all intact. Noticed that the problem seems to occur on Hi Band setting only (especially noticable when the 'bleep' goes off - it is distinctly 'bubbly' and not a stable tone) but I'll need to get this confirmed by another station listening to the audio on Mid...
by Animal
Sunday 28th Mar 2010, 0:19
Forum: CB Radio Repair and Troubleshooting
Topic: Audio 'gargle'
Replies: 7
Views: 3521

Audio 'gargle'

Radio Make and Model: Cobra 148 GTL DX PCB Number: 010AA PLL Number: Test gear available: Digital VOM, Stand Alone Counter, Symptoms: Audio on SSB is distorted (like I'm gargling with gravel) What is working: Everything else is fine. What has been tried: Checked biasing, checked offset adjustments, ...

Go to advanced search