Bleedover and adjacent channel rejection...

[Mr. 9k9]

As many have heard correctly the Cobra 200 doesn't have very good adjacent channel rejection. Is there anything that can be done to fix this? If not is there a radio on the market that is similar with great rejection?
Thanks,
DJ

[Mr. 9k9]

LMAO does this question not make sense, or is it just tough to answer?
DJ

[jcollins]

--------------------------------------------------------------------------------
Cobra Electronics Corporation
TECHNICAL SERVICE BULLETIN
10043
MODEL(S): 150GTL, 200GTL
DESCRIPTION: Receiver overloads when receiving a strong signal, resulting in distorted audio. In addition there may be a warble in the modulation when transmitting (which the customer might describe as a popping sound during transmit).

ACTION: RF is bleeding into the receiver front-end. Apply the following fix:

For both the 150GTL and 200GTL, install a 1µF electrolytic capacitor across C607. (From C607 to ground)

ADJUSTMENTS: None.

NOTES: None.


here's a tip for increasing receiver selectivity in the Cobra 200GTL-DX. place a 220pf cap from base to emitter (gnd) of Q-3. This allows T-701 to be peaked with the Noise Blanker ON for a 2 dB NB figure of merit. This does not affect overall sensitivity of the receiver and provides 55 - 60 dB of Adjacent Channel Rejection. Q3 is located near the top right corner of T707 on both the 150 and 200 GTL DX

[theonlysilentbob]

For both the 150GTL and 200GTL, install a 1µF electrolytic capacitor across C607. (From C607 to ground)

Too bad Cobra does not provide the parts for free....

[jcollins]

you got that right
i thought a long time about
buying one but i
read a lot of negative comments
on this radio on alot
of forums so i decided not now
ill wait for the 175 watt magnum s9
coming soon :PDT_010:

[Mr. 9k9]

Is there any info available on the new S9 anywhere?
DJ

[BigBopper]

I had a cobra 200 for a while and to get rid of Channel bleed over, it can be cured by installing a 10.695 Channel guard filter,
it will give you between 100dB to 80 dB adj channel Rejection


[ external image ]

[jcollins]

right now there working on
the 80 watt version
i expect the 175 watt version
in early summer
ill keep you informed as soon
as it is on the market
jon

[Mr. 9k9]

Sounds cool. I'm all over the 175 watt version. I was thinking of buying an S9 to play with anyway but now I will wait for the big one.
DJ

[marven]

I just recieved a prototype s-6 80, awesum sound, recieve is better than my ranger2970. Clear as a bell, and slap you up side the head get your attention sound!!!
I LIKE IT A LOT!!!
lost my voice from shouting!
marven

[Mr. 9k9]

Must be nice to get the prototypes.
DJ

[Guest]

COBRA is ruining their name with the 200 if you ask me!Buy a radio and then have to start redoing what they should have fixed in the first place! :lmao:

[Mr. 9k9]

I agree.

[Guest]

I've owned alot of COBRA radios over the years and they are good radios!I think they should have taken a little more time with the radio and made it right before they put them on the market! :Peace!:

[Mr. 9k9]

Don't get me wrong, I love my 200 but I agree they should have waited and got it right. I bet their next generation 10 meter will be much better. DJ

[Guest]

Oh yes!They made a mistake and they will be BACK!!The 200 is a GOOD radio don't get me wrong!After the radio is set up right and a good P&T in ROCKS! :Peace!: