The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Animal

Just an update Dave, I got hold of some adders advertised as 'new old stock' I know, I know........................ I should know better :roll: Anyway, when they arrived, the pins were so rusty they just snapped off when I handled them :doh: The remainder, which initially stayed intact, then blew aw...

Animal

Hi Animal I am one of the moderators on the euro radio co forum. A few have been rejected due to their range of IP address being used by Spammers. What problem did you have trying to register? Did you get activation email? I know you cannot get on if you give invalid information. If you answered al...

Animal

Tried to register a couple of times without success & gave up.

Animal

Factory recommendations are there for a reason. If you exceed these parameters then don't expect your finals to last as long as they would in normal service. You're also likely increase the risk of IMD, degrade the signal to noise ratio, etc, etc I haven't looked up the factory recommendations but y...

Animal

Set it to factory settings.

Animal

I've got 3 DM452 mikes and they are all very good even with different names on them. I've never had a bad report on one yet. Dave. As Dave said. I never had a bad report on mine either - but the physio-therapist bills were criminal!!! :-s They're not the most ergonomic-shaped microphone & it he...

Animal

As the title indicates, what's the audio quality like on the "minuteman 2". It will be paired with a Superstar 3900el. Thanks in advance. I believe it's got the same ceramic element as the D104M6B & the 575-M6, therefore it will be nice & loud but unsuitable for mobile use as it w...

Animal

Will do Dave.

Do I need to take any anti-static/heat precautions with these adders???

Animal

HELLO, ok i have been using an antron 99 on a 50 foot push up poll, i am very interested in a set of beams but i don't know where to start, im going to use a RCI 2980WX, can anybody tell me what the best beams would be, any advice would be helpful, thanks. If you're still considering a beam, make s...

Animal

WARLORD136 wrote:dude, i fear no man so don't feel like you have intimadated me

It's spelt 'intimidated' - get yourself a dictionary

Animal

WARLORD136 wrote:i am sure that you are a professional antenna analyist

What's an analyist??? It's not in any dictionary I know of.

Dude - take a chill-pill, no-one had a go at you so there's no need to be feeling vunerable & paranoid

Sheesh - some people eh?

Animal

Thanks Dave,

I take it these are what I need:

http://www.electronicprojectsonline.co. ... 08B&cat=51

Description is a 4 bit full adder DIL-16

Cheers

Animal

Hahahaha

Made me laugh that Jo Gunn site - 'increased audio'

WTF???

I'm sure they're well made but some of the performance figures (especially 'audio gain'

) need to be taken with a pinch of salt.

Animal

Okay Dave, Since I've adjusted L21 LL band has become operational again? Anyway, Here are the voltages from the PLL on Mid Band, Ch19 From left to right (starting with the little dimple): Pin 1 - 8.54 Pin 2 - 3.90 Pin 3 - 3.90 Pin 4 - 4.39 Pin 5 - 2.81 Pin 6 - 7.80 Pin 7 - 4.90 Pin 8 - 8.21 Pin 9 - ...

Animal

Animal, Put the counters probe to TP3 R84 and adjust L21 for 16.490 on channel 19 Mid band in AM or FM in RX mode. Let us know if it does adjust to the correct frequency. You haven't said if it's off on all modes or just AM/FM. Dave. Sorry Dave, my last post should have read TP3 R84 (not TP4) Anywa...

Animal

Okay - here goes! Started realignment (as best I can with what I've got): DC Voltmeter to TP2 (R126) & set it at 5.4V (it's stable) Set to Mid Band, Ch19, AM Mode & checked TP4 (R124) with counter and it reads 17.08055 with the slug almost to the top of L21 (& 17.92005 when the slug has ...

Animal

Thanks for the reply Tim

I'll check them out this weekend and will post the findings.

Steve

Animal

Happy New Year to everyone & a big thanks to Rick, Dave Zodiac & the Defpom.

This really is the best technical forum on the net & truly is a goldmine of invaluable information available only due the time & effort of all concerned.

All the best for 2009

Steve

Animal

Anyone?

Animal

Radio Make and Model: Cobra 148 GTL-DX PCB Number: PB 010AA PLL Number: MC145106 Test gear available: Stand Alone Frequency Counter, Digital Volt Meter, Power Meter Symptoms: TX & RX are miles off frequency What is working: Everything - just not on the correct frequency. What has been tried: Che...

Animal

Someone has PM'd me about this - however, when I try to access my Inbox to retrieve the message I get an alert informing me I'm unable to initiate PM's! That's all well & good but I'm just trying to access my Inbox FFS :-s Anyone got any idea's??? :idea: My email addy is steve(dot)woodcock5(at)b...

Animal

Anyone?

I'm looking for a source of replacement crystals for the Concorde 3 ???

Thanks in anticipation.

Animal

Cheers Dave

Any idea where's best to source the others & what load capacitance to I specify - I tried Knights & Truck King & I think Tonks are no longer trading???

I'll have a Super Hi if I can get hold of the others.

Thanks again.
Steve

Animal

Go for a cubical quad beam - they have a low take-off angle even at relatively low heights above ground.

Animal

Hi All, I've got a Ham Concorde 3 (PTBM133A4X board & PLL 02A) which has in a previous life been converted to work on 10 meters. I've looked at the Xtals & X6 is missing (no holder either) X5 = 21.252.5 (I'll change back to 20.330) X4 = 21.027.5 (I'll change back to 20.105) X3 = 20.802.5 (I'...

Animal

Try here:

http://members.tripod.com/malzev/cb-funk/ept6900.htm

The SS 158 has the 690010Z board - you'll need the correct equipment to do the job properly.

Animal

Would it be cheaper than buying an Anritsu or Marconi test set???

Can you send me a PM with your 'phone number please Rick?

Many thanks.

Animal

Cheers Rick, I've done just that - Richard said 'Rick who?'

Hope you can give me some guidance when I come to re-align the PLL loop osc

Thanks again, much obliged.

Animal

Thank you Rick - excuse my ignorance, I take it X2 is 10.240Mhz reference?

Animal

Guys A friend of mine has a Revision 2 Cobra 200 GTL DX (PCB# PFM-0090A-BE) It's well documented that the coarse clarifier shift isn't sufficient on the Rev 2 to reach the zero's (obviously it needs 5Khz at the very least but only manages approx 3Khz) I'm led to believe there are a number of ways to...

Animal

Sounds like you (ahem - your man!) has a blown reverse-polarity diode (+ & - leads hooked up the wrong way round without a fuse or one larger than 3 amps) If this is the case then you may have aslo burnt up the copper foil on the board on the + side too. If you've got an ohmmeter you can quickly...

Animal

Update! Changed driver & I've got output!!! Zzwiiing!!! 8) I sourced it from Chris at Mode Components (for a very reasonable £5.95 considering they were £12 at Knights) There are other sources in the UK for these mosfets but most had min. quantity of ten pieces & min. order value etc, etc. H...

Animal

Try this, then click on 'Projects to build':

http://home.planet.nl/~poelm348/index.html

The Skypper is a folded wire yagi and works very well.

Best wire is 'flexweave' multistrand but it's expensive.

Good Luck

Animal

I had the DX95T & it was a cracker - only minor complaint was the slight drift on SSB during warm-up (typical for a lot of radio's) but this was confined to only 0.2Khz for the first ten minutes or so - not an issue really. I always got good reports on the audio quality - it was very loud withou...

Animal

I think the original finish is something called a gel-coat (as used on marine craft hulls etc) Rub yours lightly (not too much or you'll go blind!) with aluminium oxide abrasive cloth (about 60 grit) then give it another coat. Finish off with some SWR bees-wax & a chamois leather for a hi-gloss ...

Animal

I love the old Avanti/Antenna Specialists stuff - I've got a PDL-II The A/S Super Scanner is a unique antenna - directional & omi-directional in one (switchable by a phasing system) although a compromise on a standard yagi (but there's no need for a rotator!) They're very sensitive to element le...

Animal

I was told by someone to steer clear of the ERF2030 but to use the IRF520 instead - anyone know what the deal is???

Animal

Hi Beakster, try Chris at mode componants for spares, if they're not in his catalogue, give him a ring, he's very helpful and reasonable prices. www.modecomponents.co.uk I'll second that - got two mosfets for the price it would have cost for one at that shop which is open day & Knight! :wink:

Animal

Thanks Rick - it was just a thought (the idea was to reduce the heat generated by under-driving the 2879 but getting a similar output to the 2290's)

The 200 doesn't have a fan & relies on the heatsink alone.

ATB

Steve

Animal

Well, I noticed that when I ran the rig mobile I got a virtually flat needle anyway on SSB but at home I get S4 - S5 of hash (probably from next door's plasma screen or wireless router!) When I'd done the mod, I noticed the hash level dropped to S2 - S3 at home & made it possible to hear weaker ...

Animal

Wow - $4 for the driver, much cheaper than here in the UK, the typical price is £10 each (most of which is made up of Government tax) then shipping on top!!! :shock: That said I'm happy to pay that, as our politicians deserve the proposed 25% pay increase (yeah right!) :evil: I'll swap the driver &a...

Animal

Yes, I did modify it & whilst there was an improvement it wasn't dramatic & was more noticeable when trying to copy a very weak station. If it means the diffence between making that elusive contact and missing it then I'd say it's worth it given the relatively small cost & time involved....

Animal

It's the RD16HHF1 Mike & whilst the drive is lower than that needed to get full output from the 2879, the IMD figures are lower & I'd guess they'd run cooler not being driven hard - that's the logic of the swap, not the higher output (but if I get more as a by-product then it's a bonus!) ATB...

Animal

Guys, I've got a radio with no RF output (TX into a dummy load showed nothing on the meter - also no signal received on another radio in the same room on same frequency) All other functions work as they should. Am I right thinking that if the finals have gone, I should still get output from the driv...

Animal

Any advice appreciated guys. Can a 2SC2290 transistor be replaced with a 2SC2879??? I looked at the data sheets for both & the voltages are all identical between Collector/Emitter/Base. The only difference I can see is the collector current is higher (5A more) on the 2879 (the 2290 is 20A) &...

Animal

Well, I've managed to find some info about improving the RX on this board. Change TR(Q)17 from 2SC1674 to 2SC2999 Change D1, D2, D30 & D31 to 1N6263 Shottky diodes This should improve signal to noise ratio & reduce the 'hash' noise I'm also replacing TR(Q)54 (the stock part is a 2SB754, whic...

Animal

Hi I'm looking to improve the RX section of a EPT690010Z PCB inside the Cobra 148F GTL DX+ I'm not too bothered about the AM/FM modes but I'd like to increase sensitivity of SSB without increasing the noise floor. Would replacing the stock AM detection diodes (1N60P) with ECG583 Shottky devices impr...

Animal

Try the Sirio 827 (or even the 2012/2016) with optional anti-vibration ring. It's a terrific performer & built like brick out-house. I've also used the Imax 2000 too - it is more aesthetically acceptable to the XYL & performs well, especially with the optional couterpoise but it whips around...

Animal

Imax 2000 (with groundplane kit) or Sirio 827 both have a superwide bandwidth, excellent performance & stand up well to the riggors of a hard winter. The Sirio works well on 20 meters too & can be tuned anywhere between 30Mhz & 14Mhz with an ATU although it's efficiency is reduced the fu...

Animal

As probably stated in the post above (but I couldn't be arsed reading it!) mobile interference is either picked-up via your antenna (radiated) or via your power leads (conducted) - so before you start looking for remedies you need to establish which of the two it is. Plug a dummy load into the ant s...

The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

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Cobra 148 GTL-DX Frequency Problem

Re: Rick new forum

Rick new forum

Irf520 mosfet question

Irf520 mosfet question

Re: Anyone used/got a Superstar dm-452 mic?

Re: Opinions on the Astatic minuteman 2 please

Cobra 148 GTL-DX Frequency Problem

Re: interested in beams ??

Re: interested in beams ??

Re: interested in beams ??

Cobra 148 GTL-DX Frequency Problem

interested in beams ??

Cobra 148 GTL-DX Frequency Problem

Re: Cobra 148 GTL-DX Frequency Problem

Cobra 148 GTL-DX Frequency Problem

Cobra 148 GTL-DX Frequency Problem

HNY - & a big thanks to Rick, Dave Zodiac & the Defp

Cobra 148 GTL-DX Frequency Problem

Cobra 148 GTL-DX Frequency Problem

Ham Concorde 3 - back to 11 meters

Cobra 200 Rev 2 Clarifier Range

No output - final or driver?

PA transistor swap - advice needed.

Cobra 148F GTL DX+